{"id":79421,"date":"2026-03-02T08:06:20","date_gmt":"2026-03-02T00:06:20","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/79421.html"},"modified":"2026-03-02T08:06:20","modified_gmt":"2026-03-02T00:06:20","slug":"linux-%e4%b9%8b-%e3%80%90tcp%e5%a5%97%e6%8e%a5%e5%ad%97%e7%bc%96%e7%a8%8b%e3%80%91%ef%bc%88tcp%e6%9c%8d%e5%8a%a1%e5%99%a8-%e5%ae%a2%e6%88%b7%e7%ab%af%e5%9f%ba%e6%9c%ac%e6%a8%a1%e5%9e%8b%e3%80%81tcp","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/79421.html","title":{"rendered":"Linux \u4e4b \u3010TCP\u5957\u63a5\u5b57\u7f16\u7a0b\u3011\uff08TCP\u670d\u52a1\u5668-\u5ba2\u6237\u7aef\u57fa\u672c\u6a21\u578b\u3001TCP \u4e0e UDP \u7684\u7f13\u51b2\u533a\u673a\u5236\u5bf9\u6bd4\u3001\u670d\u52a1\u5668\u7aef\u53e3\u590d\u7528\u3001\u4fe1\u53f7\u5904\u7406\u4e0e\u5199\u5931\u8d25\uff09"},"content":{"rendered":"<p id=\"main-toc\">\u76ee\u5f55<\/p>\n<p id=\"1%E3%80%81TCP%E6%9C%8D%E5%8A%A1%E5%99%A8-%E5%AE%A2%E6%88%B7%E7%AB%AF%E5%9F%BA%E6%9C%AC%E6%A8%A1%E5%9E%8B-toc\" style=\"margin-left:0px\">1\u3001TCP\u670d\u52a1\u5668-\u5ba2\u6237\u7aef\u57fa\u672c\u6a21\u578b<\/p>\n<p id=\"1.1.%E6%9C%8D%E5%8A%A1%E5%99%A8%E5%88%9D%E5%A7%8B%E5%8C%96%EF%BC%9A%E8%A2%AB%E5%8A%A8%E7%9B%91%E5%90%AC%E5%87%86%E5%A4%87-toc\" style=\"margin-left:40px\">1.1.\u670d\u52a1\u5668\u521d\u59cb\u5316&#xff1a;\u88ab\u52a8\u76d1\u542c\u51c6\u5907<\/p>\n<p id=\"1.2.%E8%BF%9E%E6%8E%A5%E5%BB%BA%E7%AB%8B%EF%BC%9A%E4%B8%89%E6%AC%A1%E6%8F%A1%E6%89%8B%EF%BC%88%E5%90%8C%E6%AD%A5%E5%BA%8F%E5%88%97%E5%8F%B7%E4%B8%8E%E7%A1%AE%E8%AE%A4%E9%80%9A%E4%BF%A1%E8%83%BD%E5%8A%9B%EF%BC%89-toc\" style=\"margin-left:40px\">1.2.\u8fde\u63a5\u5efa\u7acb&#xff1a;\u4e09\u6b21\u63e1\u624b&#xff08;\u540c\u6b65\u5e8f\u5217\u53f7\u4e0e\u786e\u8ba4\u901a\u4fe1\u80fd\u529b&#xff09;<\/p>\n<p id=\"telnet-toc\" style=\"margin-left:80px\">telnet<\/p>\n<p id=\"1.3.%E6%95%B0%E6%8D%AE%E4%BC%A0%E8%BE%93%EF%BC%9A%E5%85%A8%E5%8F%8C%E5%B7%A5%E5%8F%AF%E9%9D%A0%E9%80%9A%E4%BF%A1-toc\" style=\"margin-left:40px\">1.3.\u6570\u636e\u4f20\u8f93&#xff1a;\u5168\u53cc\u5de5\u53ef\u9760\u901a\u4fe1<\/p>\n<p id=\"1.4.%E8%BF%9E%E6%8E%A5%E6%96%AD%E5%BC%80%EF%BC%9A%E5%9B%9B%E6%AC%A1%E6%8C%A5%E6%89%8B%EF%BC%88%E7%A1%AE%E4%BF%9D%E5%8F%8C%E6%96%B9%E6%95%B0%E6%8D%AE%E4%BC%A0%E8%BE%93%E5%AE%8C%E6%88%90%EF%BC%89-toc\" style=\"margin-left:40px\">1.4.\u8fde\u63a5\u65ad\u5f00&#xff1a;\u56db\u6b21\u6325\u624b&#xff08;\u786e\u4fdd\u53cc\u65b9\u6570\u636e\u4f20\u8f93\u5b8c\u6210&#xff09;<\/p>\n<p id=\"2%E3%80%81TCP%20%E4%B8%8E%20UDP%20%E7%9A%84%E7%BC%93%E5%86%B2%E5%8C%BA%E6%9C%BA%E5%88%B6%E5%AF%B9%E6%AF%94-toc\" style=\"margin-left:0px\">2\u3001TCP \u4e0e UDP \u7684\u7f13\u51b2\u533a\u673a\u5236\u5bf9\u6bd4<\/p>\n<p id=\"2.1.TCP%20%E6%8E%A5%E6%94%B6%E7%BC%93%E5%86%B2%E5%8C%BA%20vs%20UDP%20%E6%8E%A5%E6%94%B6%E7%BC%93%E5%86%B2%E5%8C%BA-toc\" style=\"margin-left:40px\">2.1.TCP \u63a5\u6536\u7f13\u51b2\u533a vs UDP \u63a5\u6536\u7f13\u51b2\u533a<\/p>\n<p id=\"2.2TCP%20%E5%8F%91%E9%80%81%E7%BC%93%E5%86%B2%E5%8C%BA%20VS%C2%A0UDP%20%E5%8F%91%E9%80%81%E7%BC%93%E5%86%B2%E5%8C%BA-toc\" style=\"margin-left:40px\">2.2TCP \u53d1\u9001\u7f13\u51b2\u533a VS\u00a0UDP \u53d1\u9001\u7f13\u51b2\u533a<\/p>\n<p id=\"2.3%E8%AF%BB%E5%86%99%E6%93%8D%E4%BD%9C%E7%9A%84%E6%9C%AC%E8%B4%A8-toc\" style=\"margin-left:40px\">2.3\u8bfb\u5199\u64cd\u4f5c\u7684\u672c\u8d28<\/p>\n<p id=\"3.%E6%9C%8D%E5%8A%A1%E5%99%A8%E7%AB%AF%E5%8F%A3%E5%A4%8D%E7%94%A8-toc\" style=\"margin-left:0px\">3.\u670d\u52a1\u5668\u7aef\u53e3\u590d\u7528<\/p>\n<p id=\"4.%E4%BF%A1%E5%8F%B7%E5%A4%84%E7%90%86%E4%B8%8E%E5%86%99%E5%A4%B1%E8%B4%A5-toc\" style=\"margin-left:0px\">4.\u4fe1\u53f7\u5904\u7406\u4e0e\u5199\u5931\u8d25<\/p>\n<hr id=\"hr-toc\" \/>\n<h2 id=\"1%E3%80%81TCP%E6%9C%8D%E5%8A%A1%E5%99%A8-%E5%AE%A2%E6%88%B7%E7%AB%AF%E5%9F%BA%E6%9C%AC%E6%A8%A1%E5%9E%8B\">1\u3001TCP\u670d\u52a1\u5668-\u5ba2\u6237\u7aef\u57fa\u672c\u6a21\u578b<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"649\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/03\/20260302000619-69a4d47b6a62d.png\" width=\"785\" \/><\/p>\n<h3 id=\"1.1.%E6%9C%8D%E5%8A%A1%E5%99%A8%E5%88%9D%E5%A7%8B%E5%8C%96%EF%BC%9A%E8%A2%AB%E5%8A%A8%E7%9B%91%E5%90%AC%E5%87%86%E5%A4%87\">1.1.\u670d\u52a1\u5668\u521d\u59cb\u5316&#xff1a;\u88ab\u52a8\u76d1\u542c\u51c6\u5907<\/h3>\n<p>\u670d\u52a1\u5668\u901a\u8fc7socket API\u5b8c\u6210\u201c\u88ab\u52a8\u6253\u5f00\u201d&#xff0c;<span style=\"color:#fe2c24\">\u88ab\u52a8\u7b49\u5f85\u5ba2\u6237\u7aef\u8fde\u63a5<\/span><\/p>\n<li>socket()&#xff1a;\u521b\u5efa\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff08;fd&#xff09;&#xff0c;\u5206\u914d\u5185\u6838\u8d44\u6e90&#xff08;\u5982TCP\u63a7\u5236\u5757&#xff09;<\/li>\n<li>bind()&#xff1a;\u5c06fd\u4e0e\u670d\u52a1\u5668\u7684IP&#043;\u7aef\u53e3\u7ed1\u5b9a&#xff08;\u82e5\u7aef\u53e3\u5df2\u88ab\u5360\u7528\u5219\u5931\u8d25&#xff09;<\/li>\n<li>listen()&#xff1a;\u5c06fd\u6807\u8bb0\u4e3a\u76d1\u542c\u72b6\u6001&#xff0c;\u6307\u5b9a\u8fde\u63a5\u961f\u5217\u957f\u5ea6&#xff08;\u5982listen(fd, 5)\u8868\u793a\u6700\u591a\u7f13\u5b585\u4e2a\u672a\u5904\u7406\u7684\u8fde\u63a5\u8bf7\u6c42&#xff09;<\/li>\n<li>accept()&#xff1a;\u963b\u585e\u7b49\u5f85\u5ba2\u6237\u7aef\u8fde\u63a5&#xff08;\u6b64\u65f6\u670d\u52a1\u5668TCP\u5c42\u5904\u4e8eLISTEN\u72b6\u6001&#xff0c;\u6536\u5230\u5ba2\u6237\u7aefSYN\u540e\u8fdb\u5165SYN_RCVD&#xff0c;\u540e\u7eed\u901a\u8fc7\u4e09\u6b21\u63e1\u624b\u5efa\u7acb\u8fde\u63a5<\/li>\n<ul>\n<li>\u5e94\u7528\u5c42\u901a\u8fc7socket API&#xff08;\u5982connect()\/accept()&#xff09;\u89e6\u53d1TCP\u5c42\u52a8\u4f5c&#xff08;\u5982\u53d1\u9001SYN\/SYN&#043;ACK&#xff09;&#xff0c;\u901a\u8fc7\u51fd\u6570\u8fd4\u56de\u503c\u611f\u77e5TCP\u5c42\u72b6\u6001&#xff08;\u5982connect()\u8fd4\u56de\u8868\u793a\u4e09\u6b21\u63e1\u624b\u5b8c\u6210\u3001read()\u8fd4\u56de0\u8868\u793a\u6536\u5230FIN&#xff09;<\/li>\n<li>accept()\/connect()\/read()\u7b49\u51fd\u6570\u9ed8\u8ba4\u963b\u585e&#xff0c;\u7b49\u5f85TCP\u5c42\u7684\u54cd\u5e94&#xff08;\u5982SYN\u3001\u6570\u636e\u3001FIN&#xff09;&#xff0c;\u662f\u540c\u6b65IO\u7684\u6838\u5fc3\u7279\u5f81<\/li>\n<\/ul>\n<p>\u5173\u952e\u51fd\u6570&#xff1a;<span style=\"color:#fe2c24\">listen \u4e0e accept<\/span><\/p>\n<table>\n<tr><span style=\"color:null\">\u9879\u76ee<\/span><span style=\"color:null\">\u8bf4\u660e<\/span><\/tr>\n<tr>\n<td><span style=\"color:null\">\u51fd\u6570\u540d<\/span><\/td>\n<td><span style=\"color:null\">listen<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"color:null\">\u5934\u6587\u4ef6<\/span><\/td>\n<td><span style=\"color:null\">&lt;sys\/socket.h&gt;<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"color:null\">\u539f\u578b<\/span><\/td>\n<td><span style=\"color:null\">int listen(int sockfd, int backlog);<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"color:null\">\u53c2\u65701<\/span><\/td>\n<td><span style=\"color:null\">sockfd&#xff1a;\u5df2\u7ed1\u5b9a\u7684\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"color:null\">\u53c2\u65702<\/span><\/td>\n<td><span style=\"color:null\">backlog&#xff1a;\u672a\u5b8c\u6210\u8fde\u63a5\u961f\u5217\u7684\u6700\u5927\u957f\u5ea6&#xff08;\u7b49\u5f85 accept \u7684\u8fde\u63a5\u6570&#xff09;<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"color:null\">\u8fd4\u56de\u503c<\/span><\/td>\n<td><span style=\"color:null\">\u6210\u529f\u8fd4\u56de 0&#xff0c;\u5931\u8d25\u8fd4\u56de -1&#xff0c;\u8bbe\u7f6e errno<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"color:null\">\u529f\u80fd<\/span><\/td>\n<td><span style=\"color:#fe2c24\">\u5c06\u5957\u63a5\u5b57\u7531\u4e3b\u52a8\u6001\u8f6c\u53d8\u4e3a\u88ab\u52a8\u6001&#xff0c;\u5f00\u59cb\u76d1\u542c\u5ba2\u6237\u7aef\u8fde\u63a5\u8bf7\u6c42<\/span><\/td>\n<\/tr>\n<\/table>\n<table>\n<tbody>\n<tr>\n<td style=\"width:67px\">\u51fd\u6570\u540d<\/td>\n<td style=\"width:621px\">accept<\/td>\n<\/tr>\n<tr>\n<td style=\"width:67px\">\u5934\u6587\u4ef6<\/td>\n<td style=\"width:621px\">&lt;sys\/socket.h&gt;<\/td>\n<\/tr>\n<tr>\n<td style=\"width:67px\">\u539f\u578b<\/td>\n<td style=\"width:621px\">int accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen);<\/td>\n<\/tr>\n<tr>\n<td style=\"width:67px\">\u53c2\u65701<\/td>\n<td style=\"width:621px\">sockfd&#xff1a;\u76d1\u542c\u5957\u63a5\u5b57&#xff08;listen \u540e\u7684\u5957\u63a5\u5b57&#xff09;<\/td>\n<\/tr>\n<tr>\n<td style=\"width:67px\">\u53c2\u65702<\/td>\n<td style=\"width:621px\">addr&#xff1a;\u6307\u5411\u534f\u8bae\u5730\u5740\u7ed3\u6784\u7684\u6307\u9488&#xff0c;\u7528\u4e8e\u8fd4\u56de\u5ba2\u6237\u7aef\u7684\u5730\u5740\u4fe1\u606f<\/td>\n<\/tr>\n<tr>\n<td style=\"width:67px\">\u53c2\u65703<\/td>\n<td style=\"width:621px\">addrlen&#xff1a;\u5730\u5740\u7ed3\u6784\u7684\u957f\u5ea6&#xff08;\u503c-\u7ed3\u679c\u53c2\u6570&#xff09;<\/td>\n<\/tr>\n<tr>\n<td style=\"width:67px\">\u8fd4\u56de\u503c<\/td>\n<td style=\"width:621px\"><span style=\"color:#fe2c24\">\u6210\u529f\u8fd4\u56de\u65b0\u7684\u5df2\u8fde\u63a5\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u5931\u8d25\u8fd4\u56de -1<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width:67px\">\u529f\u80fd<\/td>\n<td style=\"width:621px\"><span style=\"color:#fe2c24\">\u4ece\u5df2\u5b8c\u6210\u8fde\u63a5\u961f\u5217\u4e2d\u53d6\u51fa\u7b2c\u4e00\u4e2a\u8fde\u63a5&#xff0c;\u8fd4\u56de\u4e00\u4e2a\u65b0\u5957\u63a5\u5b57\u7528\u4e8e\u4e0e\u5ba2\u6237\u7aef\u901a\u4fe1<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<li>accept\u8fd4\u56de\u7684\u65b0\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7528\u4e8e\u4e0e\u5ba2\u6237\u7aef\u901a\u4fe1&#xff0c;<span style=\"background-color:#ffd900\">\u539f\u76d1\u542c\u5957\u63a5\u5b57\u7ee7\u7eed\u7b49\u5f85\u65b0\u8fde\u63a5<\/span><\/li>\n<li>accept\u7684\u4e24\u4e2afd\u5404\u53f8\u5176\u804c&#xff1a;\u76d1\u542cfd\u53ea\u8d1f\u8d23\u63a5\u53d7\u8fde\u63a5&#xff0c;\u65b0fd\u8d1f\u8d23\u6570\u636e\u8bfb\u5199&#xff0c;\u63d0\u9ad8\u5e76\u53d1\u6548\u7387<\/li>\n<h3 id=\"1.2.%E8%BF%9E%E6%8E%A5%E5%BB%BA%E7%AB%8B%EF%BC%9A%E4%B8%89%E6%AC%A1%E6%8F%A1%E6%89%8B%EF%BC%88%E5%90%8C%E6%AD%A5%E5%BA%8F%E5%88%97%E5%8F%B7%E4%B8%8E%E7%A1%AE%E8%AE%A4%E9%80%9A%E4%BF%A1%E8%83%BD%E5%8A%9B%EF%BC%89\">1.2.\u8fde\u63a5\u5efa\u7acb&#xff1a;\u4e09\u6b21\u63e1\u624b&#xff08;\u540c\u6b65\u5e8f\u5217\u53f7\u4e0e\u786e\u8ba4\u901a\u4fe1\u80fd\u529b&#xff09;<\/h3>\n<p>\u5ba2\u6237\u7aef\u4e3b\u52a8\u53d1\u8d77\u201c\u4e3b\u52a8\u6253\u5f00\u201d&#xff0c;\u901a\u8fc7<span style=\"color:#fe2c24\">\u4e09\u6b21\u63e1\u624b<\/span>\u786e\u4fdd\u53cc\u65b9\u5177\u5907\u6536\u53d1\u80fd\u529b<\/p>\n<p>\u4e09\u6b21\u63e1\u624b\u786e\u4fdd\u8fde\u63a5\u5efa\u7acb\u7684\u53ef\u9760\u6027&#xff08;\u907f\u514d\u201c\u5df2\u5931\u6548\u7684\u8fde\u63a5\u8bf7\u6c42\u201d\u5e72\u6270&#xff09;<\/p>\n<p>ACK\u673a\u5236\u4fdd\u8bc1\u6570\u636e\u4f20\u8f93\u7684\u53ef\u9760\u6027&#xff08;\u4e22\u5931\u91cd\u4f20&#xff09;<\/p>\n<table>\n<tr>\u6b65\u9aa4\u5ba2\u6237\u7aef\u64cd\u4f5c\u670d\u52a1\u5668\u64cd\u4f5cTCP\u5c42\u72b6\u6001\u53d8\u5316<\/tr>\n<tbody>\n<tr>\n<td>1<\/td>\n<td>\u8c03\u7528socket()\u521b\u5efafd \u2192 \u8c03\u7528connect()\u53d1\u9001SYN\u6bb5&#xff08;\u540c\u6b65\u5e8f\u5217\u53f7&#xff09;<\/td>\n<td>&#8211;<\/td>\n<td>\u5ba2\u6237\u7aef&#xff1a;CLOSED\u2192SYN_SENT&#xff1b;\u670d\u52a1\u5668&#xff1a;LISTEN\u2192SYN_RCVD<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>&#8211;<\/td>\n<td>\u6536\u5230SYN\u540e&#xff0c;\u53d1\u9001SYN&#043;ACK\u6bb5&#xff08;\u540c\u6b65&#043;\u786e\u8ba4&#xff09;<\/td>\n<td>\u670d\u52a1\u5668&#xff1a;SYN_RCVD\u2192ESTABLISHED&#xff08;\u7b49\u5f85\u5ba2\u6237\u7aefACK&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>\u6536\u5230SYN&#043;ACK\u540e&#xff0c;\u53d1\u9001ACK\u6bb5\u786e\u8ba4<\/td>\n<td>\u6536\u5230ACK\u540e&#xff0c;\u5b8c\u6210\u8fde\u63a5\u5efa\u7acb<\/td>\n<td>\u5ba2\u6237\u7aef&#xff1a;SYN_SENT\u2192ESTABLISHED&#xff08;connect()\u8fd4\u56de&#xff09;&#xff1b;\u670d\u52a1\u5668&#xff1a;ESTABLISHED&#xff08;accept()\u8fd4\u56de&#xff0c;\u83b7\u5f97\u8fde\u63a5\u5957\u63a5\u5b57connfd&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li><span style=\"color:#fe2c24\">\u65e0\u9700\u663e\u793a\u7ed1\u5b9a<\/span>&#xff1a;\u5ba2\u6237\u7aef\u8c03\u7528connect\u65f6&#xff0c;\u5185\u6838\u4f1a\u81ea\u52a8\u4e3a\u5957\u63a5\u5b57\u5206\u914d\u4e34\u65f6\u7aef\u53e3&#xff08;\u9690\u5f0f\u7ed1\u5b9a&#xff09;<\/li>\n<li>\u5173\u952e\u51fd\u6570&#xff1a;<span style=\"color:#fe2c24\">connect<\/span><\/li>\n<\/ul>\n<table>\n<tbody>\n<tr>\n<td>\u51fd\u6570\u540d<\/td>\n<td>connect<\/td>\n<\/tr>\n<tr>\n<td>\u5934\u6587\u4ef6<\/td>\n<td>&lt;sys\/socket.h&gt;<\/td>\n<\/tr>\n<tr>\n<td>\u539f\u578b<\/td>\n<td>int connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen);<\/td>\n<\/tr>\n<tr>\n<td>\u53c2\u65701<\/td>\n<td>sockfd&#xff1a;socket \u51fd\u6570\u8fd4\u56de\u7684\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26<\/td>\n<\/tr>\n<tr>\n<td>\u53c2\u65702<\/td>\n<td>addr&#xff1a;\u6307\u5411\u670d\u52a1\u5668\u5730\u5740\u7ed3\u6784\u7684\u6307\u9488&#xff08;IP &#043; \u7aef\u53e3&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u53c2\u65703<\/td>\n<td>addrlen&#xff1a;\u5730\u5740\u7ed3\u6784\u7684\u5927\u5c0f<\/td>\n<\/tr>\n<tr>\n<td>\u8fd4\u56de\u503c<\/td>\n<td>\u6210\u529f\u8fd4\u56de 0&#xff0c;\u5931\u8d25\u8fd4\u56de -1<\/td>\n<\/tr>\n<tr>\n<td>\u529f\u80fd<\/td>\n<td><span style=\"color:#fe2c24\">\u5ba2\u6237\u7aef\u4e3b\u52a8\u5411\u670d\u52a1\u5668\u53d1\u8d77\u8fde\u63a5\u8bf7\u6c42&#xff08;TCP \u4e09\u6b21\u63e1\u624b&#xff09;<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>\n<h4 id=\"telnet\">telnet<\/h4>\n<\/li>\n<\/ul>\n<table>\n<tr>\u9879\u76ee\u63cf\u8ff0<\/tr>\n<tbody>\n<tr>\n<td style=\"width:82px\">\u5168\u79f0<\/td>\n<td style=\"width:607px\">Teletype Network Protocol&#xff08;\u8fdc\u7a0b\u7ec8\u7aef\u534f\u8bae&#xff09;<\/td>\n<\/tr>\n<tr>\n<td style=\"width:82px\">\u7c7b\u578b<\/td>\n<td style=\"width:607px\"><span style=\"background-color:#ffd900\">\u5e94\u7528\u5c42\u534f\u8bae<\/span>&#xff0c;\u5c5e\u4e8eTCP\/IP\u534f\u8bae\u65cf\u7684\u4e00\u90e8\u5206<\/td>\n<\/tr>\n<tr>\n<td style=\"width:82px\">\u8bbe\u8ba1\u76ee\u7684<\/td>\n<td style=\"width:607px\"><span style=\"background-color:#ffd900\">\u63d0\u4f9b\u8fdc\u7a0b\u7ec8\u7aef\u8bbf\u95ee\u670d\u52a1<\/span>&#xff0c;\u5141\u8bb8\u7528\u6237\u901a\u8fc7\u7f51\u7edc\u8fde\u63a5\u5230\u8fdc\u7a0b\u4e3b\u673a\u5e76\u6267\u884c\u547d\u4ee4&#xff0c;\u5982\u540c\u76f4\u63a5\u64cd\u4f5c\u672c\u5730\u7ec8\u7aef\u4e00\u6837<\/td>\n<\/tr>\n<tr>\n<td style=\"width:82px\">\u5de5\u4f5c\u539f\u7406<\/td>\n<td style=\"width:607px\"><span style=\"background-color:#ffd900\">\u57fa\u4e8e\u5ba2\u6237\u7aef-\u670d\u52a1\u5668\u6a21\u578b&#xff0c;\u5ba2\u6237\u7aef\u901a\u8fc7Telnet\u534f\u8bae\u8fde\u63a5\u5230\u8fdc\u7a0b\u670d\u52a1\u5668&#xff0c;\u670d\u52a1\u5668\u54cd\u5e94\u5ba2\u6237\u7aef\u8bf7\u6c42\u5e76\u6267\u884c\u76f8\u5e94\u64cd\u4f5c<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width:82px\">\u7aef\u53e3\u53f7<\/td>\n<td style=\"width:607px\">\u9ed8\u8ba4\u4f7f\u7528TCP\u7aef\u53e323<\/td>\n<\/tr>\n<tr>\n<td style=\"width:82px\">\u4f20\u8f93\u65b9\u5f0f<\/td>\n<td style=\"width:607px\"><span style=\"background-color:#ffd900\">\u660e\u6587\u4f20\u8f93<\/span>&#xff08;\u6570\u636e\u4ee5\u7eaf\u6587\u672c\u5f62\u5f0f\u5728\u7f51\u7edc\u4e0a\u4f20\u8f93&#xff0c;\u5b58\u5728\u5b89\u5168\u9690\u60a3&#xff09;<\/td>\n<\/tr>\n<tr>\n<td style=\"width:82px\">\u5b89\u5168\u6027<\/td>\n<td style=\"width:607px\">\u8f83\u4f4e&#xff0c;\u6613\u53d7\u5230\u4e2d\u95f4\u4eba\u653b\u51fb\u3001\u6570\u636e\u7a83\u542c\u7b49\u5b89\u5168\u5a01\u80c1\u3002\u73b0\u4ee3\u5e94\u7528\u4e2d\u5e38\u88ab\u66f4\u5b89\u5168\u7684\u534f\u8bae&#xff08;\u5982SSH&#xff09;\u66ff\u4ee3<\/td>\n<\/tr>\n<tr>\n<td style=\"width:82px\">\u4e3b\u8981\u529f\u80fd<\/td>\n<td style=\"width:607px\">\n<ul>\n<li>\u8fdc\u7a0b\u767b\u5f55&#xff1a;\u5141\u8bb8\u7528\u6237\u4ece\u672c\u5730\u8ba1\u7b97\u673a\u767b\u5f55\u5230\u8fdc\u7a0b\u4e3b\u673a<\/li>\n<li>\u547d\u4ee4\u6267\u884c&#xff1a;\u5728\u8fdc\u7a0b\u4e3b\u673a\u4e0a\u6267\u884c\u547d\u4ee4&#xff0c;\u5982\u540c\u76f4\u63a5\u64cd\u4f5c\u672c\u5730\u7ec8\u7aef<\/li>\n<li>\u7ec8\u7aef\u4eff\u771f&#xff1a;\u6a21\u62df\u8fdc\u7a0b\u4e3b\u673a\u7684\u7ec8\u7aef\u73af\u5883&#xff0c;\u63d0\u4f9b\u4e0e\u672c\u5730\u7ec8\u7aef\u76f8\u4f3c\u7684\u64cd\u4f5c\u4f53\u9a8c<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<tr>\n<td style=\"width:82px\">\u66ff\u4ee3\u534f\u8bae<\/td>\n<td style=\"width:607px\">SSH&#xff08;Secure Shell&#xff09;&#xff0c;\u63d0\u4f9b\u52a0\u5bc6\u901a\u4fe1\u548c\u66f4\u5f3a\u5927\u7684\u5b89\u5168\u529f\u80fd&#xff0c;\u662fTelnet\u7684\u73b0\u4ee3\u66ff\u4ee3\u65b9\u6848<\/td>\n<\/tr>\n<tr>\n<td style=\"width:82px\">\u4f18\u7f3a\u70b9<\/td>\n<td style=\"width:607px\">\n<ul>\n<li>\u4f18\u70b9&#xff1a;<span style=\"background-color:#ffd900\">\u7b80\u5355\u6613\u7528&#xff0c;\u5e7f\u6cdb\u652f\u6301<\/span><\/li>\n<li>\u7f3a\u70b9&#xff1a;<span style=\"background-color:#ffd900\">\u5b89\u5168\u6027\u4f4e<\/span>&#xff0c;\u660e\u6587\u4f20\u8f93\u6570\u636e&#xff1b;\u529f\u80fd\u76f8\u5bf9\u6709\u9650&#xff0c;\u4e0d\u5982SSH\u7b49\u73b0\u4ee3\u534f\u8bae\u5f3a\u5927<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<tr>\n<td style=\"width:82px\">\u73b0\u72b6<\/td>\n<td style=\"width:607px\">\u7531\u4e8e\u5b89\u5168\u6027\u95ee\u9898&#xff0c;Telnet\u5728\u73b0\u4ee3\u7f51\u7edc\u73af\u5883\u4e2d\u5df2\u9010\u6e10\u88ab\u6dd8\u6c70&#xff0c;\u4f46\u5728\u67d0\u4e9b\u7279\u5b9a\u573a\u666f\u6216\u65e7\u7cfb\u7edf\u4e2d\u4ecd\u53ef\u80fd\u4f7f\u7528<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<table>\n<tr>\u573a\u666f\u547d\u4ee4<\/tr>\n<tbody>\n<tr>\n<td style=\"width:227px\">\u8fde\u63a5\u8fdc\u7a0b\u4e3b\u673a<\/td>\n<td style=\"width:461px\">telnet [\u8fdc\u7a0b\u4e3b\u673aIP\u6216\u57df\u540d] [\u7aef\u53e3\u53f7]<\/td>\n<\/tr>\n<tr>\n<td style=\"width:227px\">\u9000\u51fa Telnet \u4f1a\u8bdd<\/td>\n<td style=\"width:461px\">exit\u00a0\u6216\u00a0Ctrl &#043; ]\u00a0&#043;\u00a0quit<\/td>\n<\/tr>\n<tr>\n<td style=\"width:227px\">\u6d4b\u8bd5\u7aef\u53e3\u8fde\u901a\u6027<\/td>\n<td style=\"width:461px\">telnet example.com 80<\/td>\n<\/tr>\n<tr>\n<td style=\"width:227px\">\u53d1\u9001\u7279\u6b8a\u5b57\u7b26&#xff08;\u5982\u4e2d\u65ad&#xff09;<\/td>\n<td style=\"width:461px\">\u6309\u00a0Ctrl &#043; ]\u00a0\u8fd4\u56de Telnet \u63d0\u793a\u7b26&#xff0c;\u518d\u8f93\u5165\u547d\u4ee4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3 id=\"1.3.%E6%95%B0%E6%8D%AE%E4%BC%A0%E8%BE%93%EF%BC%9A%E5%85%A8%E5%8F%8C%E5%B7%A5%E5%8F%AF%E9%9D%A0%E9%80%9A%E4%BF%A1\">1.3.\u6570\u636e\u4f20\u8f93&#xff1a;\u5168\u53cc\u5de5\u53ef\u9760\u901a\u4fe1<\/h3>\n<p>\u8fde\u63a5\u5efa\u7acb\u540e&#xff0c;TCP\u63d0\u4f9b<span style=\"color:#fe2c24\">\u5168\u53cc\u5de5\u901a\u4fe1<\/span>&#xff08;\u53cc\u65b9\u53ef\u540c\u65f6\u6536\u53d1\u6570\u636e&#xff09;\u901a\u8fc7<span style=\"color:#fe2c24\">ACK\u786e\u8ba4\u673a\u5236<\/span>\u4fdd\u8bc1\u6570\u636e\u53ef\u9760<\/p>\n<ul>\n<li>\u670d\u52a1\u5668\u4fa7&#xff1a;accept()\u8fd4\u56de\u540e&#xff0c;\u5faa\u73af\u6267\u884cread(connfd)&#xff08;\u963b\u585e\u7b49\u5f85\u5ba2\u6237\u7aef\u6570\u636e&#xff09;\u2192 \u5904\u7406\u8bf7\u6c42 \u2192 write(connfd)&#xff08;\u53d1\u9001\u5e94\u7b54&#xff09;\u2192 \u518d\u6b21read()\u7b49\u5f85\u4e0b\u4e00\u6761\u8bf7\u6c42&#xff1b;<\/li>\n<li>\u5ba2\u6237\u7aef\u4fa7&#xff1a;connect()\u8fd4\u56de\u540e&#xff0c;\u5faa\u73af\u6267\u884cwrite(fd)&#xff08;\u53d1\u9001\u8bf7\u6c42&#xff09;\u2192 read(fd)&#xff08;\u963b\u585e\u7b49\u5f85\u670d\u52a1\u5668\u5e94\u7b54&#xff09;\u2192 \u6536\u5230\u5e94\u7b54\u540e\u53d1\u9001\u4e0b\u4e00\u6761\u8bf7\u6c42&#xff1b;<\/li>\n<li>TCP\u5c42\u6838\u5fc3\u4f5c\u7528&#xff1a;\u81ea\u52a8\u5904\u7406\u6570\u636e\u5206\u6bb5\u3001ACK\u786e\u8ba4\u3001\u8d85\u65f6\u91cd\u4f20&#xff08;\u82e5\u6570\u636e\u4e22\u5931&#xff09;&#xff0c;\u5e94\u7528\u5c42\u65e0\u9700\u5173\u5fc3\u5e95\u5c42\u7ec6\u8282&#xff0c;\u4ec5\u901a\u8fc7read()\/write()\u7684\u8fd4\u56de\u503c\u611f\u77e5\u72b6\u6001&#xff08;\u5982read()\u8fd4\u56de0\u8868\u793a\u6536\u5230FIN\u6bb5&#xff0c;\u5373\u5bf9\u65b9\u5173\u95ed\u8fde\u63a5&#xff09;<\/li>\n<\/ul>\n<h3 id=\"1.4.%E8%BF%9E%E6%8E%A5%E6%96%AD%E5%BC%80%EF%BC%9A%E5%9B%9B%E6%AC%A1%E6%8C%A5%E6%89%8B%EF%BC%88%E7%A1%AE%E4%BF%9D%E5%8F%8C%E6%96%B9%E6%95%B0%E6%8D%AE%E4%BC%A0%E8%BE%93%E5%AE%8C%E6%88%90%EF%BC%89\">1.4.\u8fde\u63a5\u65ad\u5f00&#xff1a;\u56db\u6b21\u6325\u624b&#xff08;\u786e\u4fdd\u53cc\u65b9\u6570\u636e\u4f20\u8f93\u5b8c\u6210&#xff09;<\/h3>\n<p>\u5f53\u4e00\u65b9\u65e0\u6570\u636e\u4f20\u8f93\u65f6&#xff0c;\u901a\u8fc7<span style=\"color:#fe2c24\">\u56db\u6b21\u6325\u624b<\/span>\u91ca\u653e\u8fde\u63a5&#xff08;\u4ee5<span style=\"color:#fe2c24\">\u5ba2\u6237\u7aef\u4e3b\u52a8\u5173\u95ed<\/span>\u4e3a\u4f8b&#xff09;<\/p>\n<p>\u56db\u6b21\u6325\u624b\u786e\u4fdd\u8fde\u63a5\u91ca\u653e\u7684\u53ef\u9760\u6027&#xff08;\u907f\u514d\u6570\u636e\u4e22\u5931&#xff09;<\/p>\n<p>ACK\u673a\u5236\u4fdd\u8bc1\u6570\u636e\u4f20\u8f93\u7684\u53ef\u9760\u6027&#xff08;\u4e22\u5931\u91cd\u4f20&#xff09;<\/p>\n<table>\n<tr>\u6b65\u9aa4\u5ba2\u6237\u7aef\u64cd\u4f5c\/\u62a5\u6587\u670d\u52a1\u5668\u64cd\u4f5c\/\u62a5\u6587TCP\u5c42\u72b6\u6001\u53d8\u5316&#xff08;\u5ba2\u6237\u7aef\u2192\u670d\u52a1\u5668&#xff09;<\/tr>\n<tbody>\n<tr>\n<td>1<\/td>\n<td>\u8c03\u7528close(fd)&#xff0c;\u53d1\u9001FIN\u62a5\u6587&#xff08;seq&#061;u&#xff0c;\u7ed3\u675f\u201c\u5ba2\u6237\u7aef\u2192\u670d\u52a1\u5668\u201d\u7684\u53d1\u9001\u65b9\u5411&#xff09;<\/td>\n<td style=\"width:284px\">\u6536\u5230FIN\u540e&#xff0c;\u7acb\u5373\u53d1\u9001ACK\u62a5\u6587&#xff08;ack&#061;u&#043;1&#xff0c;\u786e\u8ba4\u6536\u5230FIN&#xff09;<\/td>\n<td style=\"width:182px\">\u5ba2\u6237\u7aef&#xff1a;ESTABLISHED\u2192FIN_WAIT_1&#xff1b;\u670d\u52a1\u5668&#xff1a;ESTABLISHED\u2192CLOSE_WAIT<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>\u6536\u5230\u670d\u52a1\u5668\u7684ACK&#xff0c;\u8fdb\u5165FIN_WAIT_2&#xff08;\u7b49\u5f85\u670d\u52a1\u5668\u5173\u95ed\u201c\u670d\u52a1\u5668\u2192\u5ba2\u6237\u7aef\u201d\u7684\u53d1\u9001\u65b9\u5411&#xff09;<\/td>\n<td style=\"width:284px\">\u8c03\u7528read(connfd)&#xff0c;\u8fd4\u56de0&#xff08;\u8868\u793a\u6536\u5230\u5ba2\u6237\u7aefFIN&#xff0c;\u8bfb\u7ba1\u9053\u201c\u65e0\u6570\u636e\u201d&#xff09;&#xff1b;\u5904\u7406\u5269\u4f59\u6570\u636e\u540e&#xff0c;\u8c03\u7528close(connfd)\u53d1\u9001FIN\u62a5\u6587&#xff08;seq&#061;v&#xff0c;\u7ed3\u675f\u201c\u670d\u52a1\u5668\u2192\u5ba2\u6237\u7aef\u201d\u7684\u53d1\u9001\u65b9\u5411&#xff09;<\/td>\n<td style=\"width:182px\">\u5ba2\u6237\u7aef&#xff1a;FIN_WAIT_1\u2192FIN_WAIT_2&#xff1b;\u670d\u52a1\u5668&#xff1a;CLOSE_WAIT\u2192LAST_ACK<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>\u6536\u5230\u670d\u52a1\u5668\u7684FIN&#xff0c;\u53d1\u9001ACK\u62a5\u6587&#xff08;ack&#061;v&#043;1&#xff0c;\u786e\u8ba4\u6536\u5230\u670d\u52a1\u5668FIN&#xff09;<\/td>\n<td style=\"width:284px\">\u6536\u5230\u5ba2\u6237\u7aef\u7684ACK&#xff0c;\u8fde\u63a5\u91ca\u653e<\/td>\n<td style=\"width:182px\">\u5ba2\u6237\u7aef&#xff1a;FIN_WAIT_2\u2192TIME_WAIT&#xff08;\u7b49\u5f852MSL&#xff0c;\u786e\u4fddACK\u5230\u8fbe&#xff09;&#xff1b;\u670d\u52a1\u5668&#xff1a;LAST_ACK\u2192CLOSED<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>\u7b49\u5f852MSL&#xff08;\u6700\u5927\u62a5\u6587\u6bb5\u5bff\u547d\u76842\u500d&#xff0c;\u7ea61-4\u5206\u949f&#xff09;\u540e&#xff0c;\u8fdb\u5165CLOSED<\/td>\n<td style=\"width:284px\">&#8211;<\/td>\n<td style=\"width:182px\">\u5ba2\u6237\u7aef&#xff1a;TIME_WAIT\u2192CLOSED<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 id=\"2%E3%80%81TCP%20%E4%B8%8E%20UDP%20%E7%9A%84%E7%BC%93%E5%86%B2%E5%8C%BA%E6%9C%BA%E5%88%B6%E5%AF%B9%E6%AF%94\">2\u3001TCP \u4e0e UDP \u7684\u7f13\u51b2\u533a\u673a\u5236\u5bf9\u6bd4<\/h2>\n<h3 id=\"2.1.TCP%20%E6%8E%A5%E6%94%B6%E7%BC%93%E5%86%B2%E5%8C%BA%20vs%20UDP%20%E6%8E%A5%E6%94%B6%E7%BC%93%E5%86%B2%E5%8C%BA\">2.1.TCP \u63a5\u6536\u7f13\u51b2\u533a vs UDP \u63a5\u6536\u7f13\u51b2\u533a<\/h3>\n<table>\n<tr>\u7279\u6027TCP \u63a5\u6536\u7f13\u51b2\u533aUDP \u63a5\u6536\u7f13\u51b2\u533a<\/tr>\n<tbody>\n<tr>\n<td>\u5b58\u5728\u6027<\/td>\n<td>\u6709&#xff08;\u5185\u6838\u4e2d\u7ef4\u62a4&#xff0c;\u7528\u4e8e\u5b58\u50a8\u6309\u5e8f\u5230\u8fbe\u4f46\u672a\u88ab\u5e94\u7528\u8bfb\u53d6\u7684\u6570\u636e&#xff09;<\/td>\n<td>\u6709&#xff08;\u5185\u6838\u4e2d\u7ef4\u62a4&#xff0c;\u7528\u4e8e\u4e34\u65f6\u5b58\u50a8\u6536\u5230\u7684\u6570\u636e\u62a5&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u4e3b\u8981\u76ee\u7684<\/td>\n<td>1.\u00a0\u6309\u5e8f\u91cd\u7ec4&#xff1a;\u786e\u4fdd\u6570\u636e\u6309\u53d1\u9001\u987a\u5e8f\u4ea4\u4ed8\u7ed9\u5e94\u7528\u5c42\u3002 2.\u00a0\u6d41\u91cf\u63a7\u5236&#xff1a;\u901a\u8fc7\u7a97\u53e3\u673a\u5236\u901a\u77e5\u53d1\u9001\u65b9\u63a5\u6536\u80fd\u529b&#xff0c;\u907f\u514d\u7f13\u51b2\u533a\u6ea2\u51fa\u3002 3.\u00a0\u89e3\u8026\u5e94\u7528\u5c42\u4e0e\u7f51\u7edc&#xff1a;\u5e94\u7528\u5c42\u53ef\u6309\u9700\u8bfb\u53d6\u6570\u636e&#xff0c;\u65e0\u9700\u5b9e\u65f6\u5904\u7406\u3002<\/td>\n<td>1.\u00a0\u4e34\u65f6\u5b58\u50a8&#xff1a;\u4ec5\u4fdd\u5b58\u6536\u5230\u7684\u6570\u636e\u62a5&#xff0c;\u4e0d\u4fdd\u8bc1\u987a\u5e8f\u3002 2.\u00a0\u65e0\u8fde\u63a5\u89e3\u8026&#xff1a;\u5e94\u7528\u5c42\u9700\u81ea\u884c\u5904\u7406\u6570\u636e\u62a5\u7684\u987a\u5e8f\u548c\u5b8c\u6574\u6027\u3002 3.\u00a0\u7b80\u5355\u7f13\u51b2&#xff1a;\u4ec5\u7f13\u89e3\u7f51\u5361\u4e0e\u5e94\u7528\u5c42\u4e4b\u95f4\u7684\u901f\u5ea6\u5dee\u5f02\u3002<\/td>\n<\/tr>\n<tr>\n<td>\u6570\u636e\u6392\u5e8f<\/td>\n<td>\u4e25\u683c\u6309\u5e8f&#xff1a;TCP \u901a\u8fc7\u5e8f\u5217\u53f7\u786e\u4fdd\u6570\u636e\u6309\u5e8f\u4ea4\u4ed8&#xff0c;\u4e71\u5e8f\u6570\u636e\u4f1a\u6682\u5b58\u7f13\u51b2\u533a&#xff0c;\u7b49\u5f85\u7f3a\u5931\u6570\u636e\u5230\u8fbe\u540e\u518d\u7ec4\u88c5\u3002<\/td>\n<td>\u65e0\u5e8f&#xff1a;UDP \u4e0d\u4fdd\u8bc1\u6570\u636e\u987a\u5e8f&#xff0c;\u6bcf\u4e2a\u6570\u636e\u62a5\u72ec\u7acb\u5904\u7406&#xff0c;\u5e94\u7528\u5c42\u9700\u81ea\u884c\u5904\u7406\u987a\u5e8f\u95ee\u9898\u3002<\/td>\n<\/tr>\n<tr>\n<td>\u7f13\u51b2\u533a\u6ee1\u65f6\u884c\u4e3a<\/td>\n<td>1.\u00a0\u901a\u544a\u7a97\u53e3\u51cf\u5c0f&#xff1a;\u901a\u8fc7 TCP \u7a97\u53e3\u673a\u5236\u901a\u77e5\u53d1\u9001\u65b9\u964d\u4f4e\u53d1\u9001\u901f\u7387&#xff08;\u6d41\u91cf\u63a7\u5236&#xff09;\u3002 2.\u00a0\u6781\u7aef\u60c5\u51b5\u4e0b\u53ef\u80fd\u4e22\u5f03\u6570\u636e&#xff08;\u5982\u6301\u7eed\u8d85\u9650&#xff0c;\u4f46\u4f1a\u4f18\u5148\u4fdd\u8bc1\u53ef\u9760\u6027&#xff09;\u3002<\/td>\n<td>1.\u00a0\u4e22\u5f03\u65b0\u6570\u636e&#xff1a;\u82e5\u7f13\u51b2\u533a\u6ee1&#xff0c;\u65b0\u5230\u8fbe\u7684\u6570\u636e\u62a5\u76f4\u63a5\u4e22\u5f03\u3002 2.\u00a0\u65e0\u91cd\u4f20\u673a\u5236&#xff1a;\u53d1\u9001\u65b9\u4e0d\u4f1a\u56e0\u63a5\u6536\u7f13\u51b2\u533a\u6ee1\u800c\u91cd\u4f20&#xff08;UDP \u672c\u8eab\u65e0\u91cd\u4f20&#xff09;\u3002<\/td>\n<\/tr>\n<tr>\n<td>\u6570\u636e\u751f\u547d\u5468\u671f<\/td>\n<td>\u76f4\u5230\u5e94\u7528\u8bfb\u53d6\u6216\u8d85\u65f6&#xff1a;\u6570\u636e\u5728\u7f13\u51b2\u533a\u4e2d\u4fdd\u7559&#xff0c;\u76f4\u5230\u5e94\u7528\u5c42\u901a\u8fc7\u00a0read()\u00a0\u8bfb\u53d6&#xff0c;\u6216\u56e0\u8d85\u65f6&#xff08;\u5982 RTO&#xff09;\u88ab\u4e22\u5f03\u3002<\/td>\n<td>\u76f4\u5230\u5e94\u7528\u8bfb\u53d6\u6216\u88ab\u8986\u76d6&#xff1a;\u6570\u636e\u62a5\u5728\u7f13\u51b2\u533a\u4e2d\u4fdd\u7559&#xff0c;\u76f4\u5230\u5e94\u7528\u5c42\u8bfb\u53d6&#xff1b;\u82e5\u7f13\u51b2\u533a\u6ee1\u4e14\u65b0\u6570\u636e\u5230\u8fbe&#xff0c;\u65e7\u6570\u636e\u53ef\u80fd\u88ab\u8986\u76d6\u6216\u4e22\u5f03\u3002<\/td>\n<\/tr>\n<tr>\n<td>\u5e94\u7528\u5c42\u4ea4\u4e92<\/td>\n<td>\u80cc\u538b\u4f20\u9012&#xff1a;\u901a\u8fc7\u6ed1\u52a8\u7a97\u53e3\u673a\u5236\u52a8\u6001\u8c03\u6574\u53d1\u9001\u901f\u7387&#xff0c;\u907f\u514d\u63a5\u6536\u7f13\u51b2\u533a\u6ea2\u51fa\u3002<\/td>\n<td>\u65e0\u80cc\u538b&#xff1a;\u5e94\u7528\u5c42\u9700\u81ea\u884c\u76d1\u63a7\u7f13\u51b2\u533a\u72b6\u6001&#xff08;\u5982\u901a\u8fc7\u00a0recv()\u00a0\u8fd4\u56de\u503c&#xff09;&#xff0c;\u53ef\u80fd\u56e0\u7f13\u51b2\u533a\u6ee1\u5bfc\u81f4\u6570\u636e\u4e22\u5931\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3 id=\"2.2TCP%20%E5%8F%91%E9%80%81%E7%BC%93%E5%86%B2%E5%8C%BA%20VS%C2%A0UDP%20%E5%8F%91%E9%80%81%E7%BC%93%E5%86%B2%E5%8C%BA\" style=\"background-color:transparent\">2.2TCP \u53d1\u9001\u7f13\u51b2\u533a VS\u00a0UDP \u53d1\u9001\u7f13\u51b2\u533a<\/h3>\n<table>\n<tr>\u7279\u6027TCP \u53d1\u9001\u7f13\u51b2\u533aUDP \u53d1\u9001\u7f13\u51b2\u533a<\/tr>\n<tbody>\n<tr>\n<td>\u5b58\u5728\u6027<\/td>\n<td>\u6709&#xff08;\u5185\u6838\u4e2d&#xff09;<\/td>\n<td>\u6709&#xff08;\u5185\u6838\u4e2d&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u4e3b\u8981\u76ee\u7684<\/td>\n<td>\u53ef\u9760\u4f20\u8f93\u3001\u6d41\u91cf\u63a7\u5236\u3001\u62e5\u585e\u63a7\u5236<\/td>\n<td>\u5e73\u6ed1\u7a81\u53d1\u3001\u89e3\u8026\u5e94\u7528\u5c42\u4e0e\u7f51\u5361<\/td>\n<\/tr>\n<tr>\n<td>\u91cd\u4f20\u673a\u5236<\/td>\n<td>\u6709&#xff08;\u8d85\u65f6\u91cd\u4f20&#xff09;<\/td>\n<td>\u65e0&#xff08;\u4e22\u4e86\u5c31\u4e22\u4e86&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u7f13\u51b2\u533a\u6ee1\u65f6<\/td>\n<td>\u963b\u585e\u5e94\u7528\u5c42\u5199\u5165&#xff08;\u80cc\u538b&#xff09;<\/td>\n<td>\u4e22\u5f03\u65b0\u6570\u636e \u6216 \u8fd4\u56de\u9519\u8bef (EAGAIN)<\/td>\n<\/tr>\n<tr>\n<td>\u6570\u636e\u751f\u547d\u5468\u671f<\/td>\n<td>\u76f4\u5230\u6536\u5230 ACK \u624d\u5220\u9664<\/td>\n<td>\u4ea4\u7ed9\u7f51\u5361\u540e\u5373\u5220\u9664&#xff08;\u6216\u5931\u8d25\u65f6\u4e22\u5f03&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n\u2502                          \u8fdb\u7a0b\u7a7a\u95f4 (\u7528\u6237\u7a7a\u95f4)                          \u2502<br \/>\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510              \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510      \u2502<br \/>\n\u2502  \u2502    \u8bfb\u7f13\u51b2\u533a         \u2502              \u2502    \u5199\u7f13\u51b2\u533a         \u2502      \u2502<br \/>\n\u2502  \u2502  char recv_buf[1024]\u2502              \u2502  char send_buf[1024]\u2502      \u2502<br \/>\n\u2502  \u2502  (\u5e94\u7528\u7a0b\u5e8f\u5206\u914d)     \u2502              \u2502  (\u5e94\u7528\u7a0b\u5e8f\u5206\u914d)     \u2502      \u2502<br \/>\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518              \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518      \u2502<br \/>\n\u2502             \u2502                                    \u2502                   \u2502<br \/>\n\u2502             \u2502 recv()\/recvfrom()                  \u2502 send()\/sendto()   \u2502<br \/>\n\u2502             \u2502 \u4ece\u5185\u6838\u62f7\u8d1d\u5230\u7528\u6237                    \u2502 \u4ece\u7528\u6237\u62f7\u8d1d\u5230\u5185\u6838   \u2502<br \/>\n\u2502             \u25bc                                    \u25bc                   \u2502<br \/>\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<br \/>\n              \u2502                                    \u2502<br \/>\n              \u2193 \u6570\u636e\u62f7\u8d1d                            \u2193 \u6570\u636e\u62f7\u8d1d<br \/>\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n\u2502  \u5185\u6838\u7a7a\u95f4   \u2502                                    \u2502                   \u2502<br \/>\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25bc\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510              \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25bc\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510      \u2502<br \/>\n\u2502  \u2502    \u63a5\u6536\u7f13\u51b2\u533a        \u2502              \u2502    \u53d1\u9001\u7f13\u51b2\u533a        \u2502      \u2502<br \/>\n\u2502  \u2502  (struct sk_buff\u961f\u5217)\u2502              \u2502  (struct sk_buff\u961f\u5217)\u2502      \u2502<br \/>\n\u2502  \u2502                     \u2502              \u2502                     \u2502      \u2502<br \/>\n\u2502  \u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510  \u2502              \u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510  \u2502      \u2502<br \/>\n\u2502  \u2502  \u2502 sk_buff1      \u2502  \u2502              \u2502  \u2502 sk_buff1      \u2502  \u2502      \u2502<br \/>\n\u2502  \u2502  \u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524  \u2502              \u2502  \u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524  \u2502      \u2502<br \/>\n\u2502  \u2502  \u2502 sk_buff2      \u2502  \u2502              \u2502  \u2502 sk_buff2      \u2502  \u2502      \u2502<br \/>\n\u2502  \u2502  \u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524  \u2502              \u2502  \u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524  \u2502      \u2502<br \/>\n\u2502  \u2502  \u2502 &#8230;           \u2502  \u2502              \u2502  \u2502 &#8230;           \u2502  \u2502      \u2502<br \/>\n\u2502  \u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518  \u2502              \u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518  \u2502      \u2502<br \/>\n\u2502  \u2502                     \u2502              \u2502                     \u2502      \u2502<br \/>\n\u2502  \u2502  \u2022 \u5df2\u6536\u5230\u4f46\u672a\u8bfb      \u2502              \u2502  \u2022 \u5df2\u5199\u5165\u4f46\u672a\u53d1\u9001    \u2502      \u2502<br \/>\n\u2502  \u2502  \u2022 \u7b49\u5f85\u5e94\u7528\u7a0b\u5e8f\u8bfb\u53d6  \u2502              \u2502  \u2022 \u7b49\u5f85\u7f51\u7edc\u534f\u8bae\u6808\u53d1\u9001\u2502      \u2502<br \/>\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518              \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518      \u2502<br \/>\n\u2502             \u2502                                    \u2502                   \u2502<br \/>\n\u2502             \u2502 \u534f\u8bae\u6808\u5904\u7406                          \u2502 \u534f\u8bae\u6808\u5904\u7406        \u2502<br \/>\n\u2502             \u25bc                                    \u25bc                   \u2502<br \/>\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25bc\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510              \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25bc\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510      \u2502<br \/>\n\u2502  \u2502    TCP\/IP\u534f\u8bae\u6808     \u2502              \u2502    TCP\/IP\u534f\u8bae\u6808     \u2502      \u2502<br \/>\n\u2502  \u2502  \u2022 \u91cd\u7ec4\u6570\u636e\u5305       \u2502              \u2502  \u2022 \u5206\u6bb5             \u2502      \u2502<br \/>\n\u2502  \u2502  \u2022 \u6821\u9a8c\u548c\u68c0\u67e5       \u2502              \u2502  \u2022 \u6dfb\u52a0\u5934\u90e8         \u2502      \u2502<br \/>\n\u2502  \u2502  \u2022 \u987a\u5e8f\u63a7\u5236         \u2502              \u2502  \u2022 \u8ba1\u7b97\u6821\u9a8c\u548c       \u2502      \u2502<br \/>\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518              \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518      \u2502<br \/>\n\u2502             \u2502                                    \u2502                   \u2502<br \/>\n\u2502             \u2193 \u6570\u636e\u6765\u81ea\u7f51\u7edc                        \u2193 \u6570\u636e\u53d1\u5f80\u7f51\u7edc      \u2502<br \/>\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25bc\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510              \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25bc\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510      \u2502<br \/>\n\u2502  \u2502     \u7f51\u5361\u9a71\u52a8        \u2502              \u2502     \u7f51\u5361\u9a71\u52a8        \u2502      \u2502<br \/>\n\u2502  \u2502  (\u63a5\u6536\u4e2d\u65ad\u5904\u7406)     \u2502              \u2502  (\u53d1\u9001DMA\u4f20\u8f93)      \u2502      \u2502<br \/>\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518              \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518      \u2502<br \/>\n\u2502             \u2502                                    \u2502                   \u2502<br \/>\n\u2502             \u2193 DMA\u62f7\u8d1d                             \u2191 DMA\u62f7\u8d1d          \u2502<br \/>\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25bc\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510              \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25bc\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510      \u2502<br \/>\n\u2502  \u2502   \u7f51\u5361\u786c\u4ef6\u7f13\u51b2\u533a    \u2502              \u2502   \u7f51\u5361\u786c\u4ef6\u7f13\u51b2\u533a    \u2502      \u2502<br \/>\n\u2502  \u2502   (Ring Buffer)    \u2502              \u2502   (Ring Buffer)    \u2502      \u2502<br \/>\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518              \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518      \u2502<br \/>\n\u2502             \u2502                                    \u2502                   \u2502<br \/>\n\u2502             \u2193 \u7f51\u7edc\u4f20\u8f93                            \u2191 \u7f51\u7edc\u4f20\u8f93         \u2502<br \/>\n\u2502         \u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500               \u2502<br \/>\n\u2502                           \u7f51\u7edc                                       \u2502<br \/>\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<br \/>\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n\u2502                          \u8fdb\u7a0b\u7a7a\u95f4 (\u7528\u6237\u7a7a\u95f4)                          \u2502<br \/>\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510              \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510      \u2502<br \/>\n\u2502  \u2502    \u8bfb\u7f13\u51b2\u533a         \u2502              \u2502    \u5199\u7f13\u51b2\u533a         \u2502      \u2502<br \/>\n\u2502  \u2502  char recv_buf[1024]\u2502              \u2502  char send_buf[1024]\u2502      \u2502<br \/>\n\u2502  \u2502  (\u5e94\u7528\u7a0b\u5e8f\u5206\u914d)     \u2502              \u2502  (\u5e94\u7528\u7a0b\u5e8f\u5206\u914d)     \u2502      \u2502<br \/>\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518              \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518      \u2502<br \/>\n\u2502             \u2502                                    \u2502                   \u2502<br \/>\n\u2502             \u2502 recvfrom()                          \u2502 sendto()         \u2502<br \/>\n\u2502             \u2502 \u4ece\u5185\u6838\u62f7\u8d1d\u5230\u7528\u6237                    \u2502 \u4ece\u7528\u6237\u62f7\u8d1d\u5230\u5185\u6838   \u2502<br \/>\n\u2502             \u2502 (\u7b49\u5f85\u6570\u636e\u5230\u8fbe)                       \u2502 (\u7acb\u5373\u8fd4\u56de)\u2460       \u2502<br \/>\n\u2502             \u25bc                                    \u25bc                   \u2502<br \/>\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<br \/>\n              \u2502                                    \u2502<br \/>\n              \u2193 \u6570\u636e\u62f7\u8d1d                            \u2193 \u6570\u636e\u62f7\u8d1d<br \/>\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n\u2502  \u5185\u6838\u7a7a\u95f4   \u2502                                    \u2502                   \u2502<br \/>\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25bc\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510              \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25bc\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510      \u2502<br \/>\n\u2502  \u2502    \u63a5\u6536\u7f13\u51b2\u533a        \u2502              \u2502    UDP\u534f\u8bae\u5c42        \u2502      \u2502<br \/>\n\u2502  \u2502  (socket\u63a5\u6536\u961f\u5217)   \u2502              \u2502  \u2022 \u6dfb\u52a0UDP\u5934        \u2502      \u2502<br \/>\n\u2502  \u2502                     \u2502              \u2502  \u2022 \u8ba1\u7b97\u6821\u9a8c\u548c       \u2502      \u2502<br \/>\n\u2502  \u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510  \u2502              \u2502  \u2022 \u5c01\u88c5\u6210\u6570\u636e\u62a5     \u2502      \u2502<br \/>\n\u2502  \u2502  \u2502 \u6570\u636e\u62a51       \u2502  \u2502              \u2502  \u2022 \u65e0\u62e5\u585e\u63a7\u5236       \u2502      \u2502<br \/>\n\u2502  \u2502  \u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524  \u2502              \u2502  \u2022 \u65e0\u91cd\u4f20           \u2502      \u2502<br \/>\n\u2502  \u2502  \u2502 \u6570\u636e\u62a52       \u2502  \u2502              \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518      \u2502<br \/>\n\u2502  \u2502  \u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524  \u2502                         \u2502                   \u2502<br \/>\n\u2502  \u2502  \u2502 &#8230;           \u2502  \u2502                         \u2502 \u52a0\u5165\u534f\u8bae\u6808        \u2502<br \/>\n\u2502  \u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518  \u2502                         \u25bc                   \u2502<br \/>\n\u2502  \u2502                     \u2502              \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510    \u2502<br \/>\n\u2502  \u2502  \u2022 \u5df2\u5230\u8fbe\u4f46\u672a\u8bfb      \u2502              \u2502     IP\u534f\u8bae\u5c42            \u2502    \u2502<br \/>\n\u2502  \u2502  \u2022 \u6bcf\u4e2a\u6570\u636e\u62a5\u72ec\u7acb    \u2502   \u25c0\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 \u2502  \u2022 \u8def\u7531\u67e5\u627e            \u2502    \u2502<br \/>\n\u2502  \u2502  \u2022 \u53ef\u80fd\u4e22\u5931\u6216\u4e71\u5e8f    \u2502     \u56de\u9000\u8def\u5f84  \u2502  \u2022 \u5206\u7247\u5904\u7406            \u2502    \u2502<br \/>\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518              \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518      \u2502<br \/>\n\u2502             \u2502                                    \u2502                   \u2502<br \/>\n\u2502             \u2193 \u6570\u636e\u6765\u81ea\u7f51\u7edc                        \u2502 \u52a0\u5165Qdisc\u961f\u5217      \u2502<br \/>\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25bc\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510              \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25bc\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510      \u2502<br \/>\n\u2502  \u2502    UDP\u534f\u8bae\u5c42        \u2502              \u2502  Qdisc (\u6392\u961f\u89c4\u5219)    \u2502\u25c0\u2550\u2550\u2550\u2550\u2550\u2461  \u2502<br \/>\n\u2502  \u2502  \u2022 \u53bb\u9664UDP\u5934        \u2502              \u2502  \u2022 \u7cfb\u7edf\u7684\u53d1\u9001\u7f13\u51b2\u533a  \u2502      \u2502<br \/>\n\u2502  \u2502  \u2022 \u6821\u9a8c\u548c\u68c0\u67e5       \u2502              \u2502  \u2022 \u9ed8\u8ba4pfifo_fast    \u2502      \u2502<br \/>\n\u2502  \u2502  \u2022 \u6839\u636e\u7aef\u53e3\u5206\u53d1      \u2502              \u2502  \u2022 \u5927\u5c0f\u7531txqueuelen  \u2502      \u2502<br \/>\n\u2502  \u2502  \u2022 \u65e0\u987a\u5e8f\u4fdd\u8bc1       \u2502              \u2502    \u51b3\u5b9a(\u9ed8\u8ba41000)    \u2502      \u2502<br \/>\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518              \u2502  \u2022 \u5982\u679c\u6ee1\u4e86:\u4e22\u5305\u2462    \u2502      \u2502<br \/>\n\u2502             \u2502                         \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518      \u2502<br \/>\n\u2502             \u2193                                    \u2502                   \u2502<br \/>\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25bc\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510                         \u2193                   \u2502<br \/>\n\u2502  \u2502      IP\u534f\u8bae\u5c42       \u2502              \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25bc\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510      \u2502<br \/>\n\u2502  \u2502   (\u7f51\u7edc\u5c42\u5904\u7406)      \u2502\u25c0\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2502     \u7f51\u5361\u9a71\u52a8        \u2502      \u2502<br \/>\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518   \u4eceQdisc     \u2502  (\u53d1\u9001DMA\u4f20\u8f93)      \u2502      \u2502<br \/>\n\u2502             \u2502              \u53d6\u51fa\u6570\u636e\u62a5   \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518      \u2502<br \/>\n\u2502             \u2193                                    \u2502                   \u2502<br \/>\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25bc\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510                         \u2193 DMA\u62f7\u8d1d           \u2502<br \/>\n\u2502  \u2502     \u7f51\u5361\u9a71\u52a8        \u2502              \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25bc\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510      \u2502<br \/>\n\u2502  \u2502  (\u63a5\u6536\u4e2d\u65ad\u5904\u7406)     \u2502              \u2502   \u7f51\u5361\u786c\u4ef6\u7f13\u51b2\u533a    \u2502      \u2502<br \/>\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518              \u2502   (Ring Buffer)    \u2502      \u2502<br \/>\n\u2502             \u2502                         \u2502   \u2022 \u5982\u679c\u6ee1\u4e86:\u4e22\u5305\u2463  \u2502      \u2502<br \/>\n\u2502             \u2193 DMA\u62f7\u8d1d                   \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518      \u2502<br \/>\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25bc\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510                         \u2502                   \u2502<br \/>\n\u2502  \u2502   \u7f51\u5361\u786c\u4ef6\u7f13\u51b2\u533a    \u2502                         \u2193 \u7f51\u7edc\u4f20\u8f93         \u2502<br \/>\n\u2502  \u2502   (Ring Buffer)    \u2502              \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25bc\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510      \u2502<br \/>\n\u2502  \u2502   \u2022 \u63a5\u6536\u6570\u636e\u6682\u5b58    \u2502              \u2502       \u7269\u7406\u7f51\u7ebf       \u2502      \u2502<br \/>\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518              \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518      \u2502<br \/>\n\u2502             \u2502                                    \u2502                   \u2502<br \/>\n\u2502             \u2193 \u7f51\u7edc\u4f20\u8f93                            \u2502                   \u2502<br \/>\n\u2502         \u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500               \u2502<br \/>\n\u2502                           \u7f51\u7edc                                       \u2502<br \/>\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 <\/p>\n<h3 id=\"2.3%E8%AF%BB%E5%86%99%E6%93%8D%E4%BD%9C%E7%9A%84%E6%9C%AC%E8%B4%A8\">2.3\u8bfb\u5199\u64cd\u4f5c\u7684\u672c\u8d28<\/h3>\n<p><span style=\"color:#fe2c24\">TCP\/UDP\u8bfb\u5199\u64cd\u4f5c\u672c\u8d28\u4e0a\u662f\u5bf9\u5185\u6838\u4e2d\u53d1\u9001\u7f13\u51b2\u533a\u548c\u63a5\u6536\u7f13\u51b2\u533a\u7684\u6570\u636e\u62f7\u8d1d<\/span><\/p>\n<p>\u5199\u64cd\u4f5c&#xff1a;\u7528\u6237\u7a7a\u95f4 -&gt; \u5185\u6838\u7a7a\u95f4&#xff08;\u62f7\u8d1d&#xff09;<\/p>\n<ul>\n<li>TCP&#xff1a;\u62f7\u8d1d\u5230\u53d1\u9001\u7f13\u51b2\u533a&#xff0c;\u7531\u534f\u8bae\u6808\u8d1f\u8d23\u540e\u7eed\u91cd\u4f20\u3001\u6392\u5e8f\u3001\u6d41\u91cf\u63a7\u5236<\/li>\n<li>UDP&#xff1a;\u62f7\u8d1d\u5230\u53d1\u9001\u7f13\u51b2\u533a&#xff0c;\u534f\u8bae\u6808\u5c3d\u5feb\u53d1\u9001&#xff0c;\u4e0d\u6392\u961f\u7b49\u5f85 ACK<\/li>\n<\/ul>\n<p>\u8bfb\u64cd\u4f5c&#xff1a;\u5185\u6838\u7a7a\u95f4 -&gt; \u7528\u6237\u7a7a\u95f4&#xff08;\u62f7\u8d1d&#xff09;<\/p>\n<ul>\n<li>\u4e24\u8005\u90fd\u4ece\u63a5\u6536\u7f13\u51b2\u533a\u62f7\u8d1d\u3002\u82e5\u65e0\u6570\u636e&#xff0c;\u884c\u4e3a\u53d6\u51b3\u4e8e I\/O \u6a21\u5f0f&#xff08;\u963b\u585e\/\u975e\u963b\u585e\/\u4fe1\u53f7\u9a71\u52a8&#xff09;<\/li>\n<\/ul>\n<p>\u5199\u64cd\u4f5c\u5c06\u7528\u6237\u6570\u636e\u62f7\u8d1d\u5230\u5185\u6838\u53d1\u9001\u7f13\u51b2\u533a\u7b49\u5f85\u7f51\u7edc\u53d1\u9001&#xff0c;\u8bfb\u64cd\u4f5c\u4ece\u5185\u6838\u63a5\u6536\u7f13\u51b2\u533a\u62f7\u8d1d\u6570\u636e\u5230\u7528\u6237\u7a7a\u95f4&#xff0c;\u8fd9<span style=\"color:#fe2c24\">\u4e24\u4e2a\u7f13\u51b2\u533a\u5b8c\u5168\u72ec\u7acb\u3001\u4e92\u4e0d\u5e72\u6270<\/span>&#xff0c;\u56e0\u6b64\u8bfb\u5199\u64cd\u4f5c\u53ef\u4ee5\u540c\u65f6\u8fdb\u884c\u800c\u4e0d\u4f1a\u51b2\u7a81&#xff1b;\u5f53\u63a5\u6536\u7f13\u51b2\u533a\u4e3a\u7a7a\u65f6\u8bfb\u64cd\u4f5c\u4f1a\u963b\u585e&#xff08;\u9664\u975e\u8bbe\u7f6e\u975e\u963b\u585e&#xff09;&#xff0c;\u5f53\u53d1\u9001\u7f13\u51b2\u533a\u6ee1\u65f6\u5199\u64cd\u4f5c\u4f1a\u963b\u585e&#xff0c;\u8fd9\u79cd\u8bbe\u8ba1\u5b9e\u73b0\u4e86\u5168\u53cc\u5de5\u901a\u4fe1&#xff0c;\u4f7f\u5f97\u7f51\u7edc\u6570\u636e\u7684\u6536\u53d1\u53ef\u4ee5\u5e76\u53d1\u5904\u7406&#xff0c;\u5927\u5927\u63d0\u9ad8\u4e86\u901a\u4fe1\u6548\u7387<\/p>\n<h2 id=\"3.%E6%9C%8D%E5%8A%A1%E5%99%A8%E7%AB%AF%E5%8F%A3%E5%A4%8D%E7%94%A8\">3.\u670d\u52a1\u5668\u7aef\u53e3\u590d\u7528<\/h2>\n<p>\u670d\u52a1\u5668\u4e3b\u52a8\u5173\u95ed\u540e&#xff0c;\u7aef\u53e3\u53ef\u80fd\u8fdb\u5165TIME_WAIT\u72b6\u6001&#xff0c;\u5bfc\u81f4\u7acb\u5373\u91cd\u542f\u65f6\u7ed1\u5b9a\u5931\u8d25<\/p>\n<p>\u7ed1\u5b9a\u5931\u8d25\u7684\u539f\u56e0&#xff1a;\u5f53\u7aef\u53e3\u88ab\u6807\u8bb0\u4e3aTIME_WAIT\u72b6\u6001&#xff0c;\u64cd\u4f5c\u7cfb\u7edf\u4f1a\u62d2\u7edd\u670d\u52a1\u5668\u5c1d\u8bd5\u91cd\u542f\u5e76\u7ed1\u5b9a\u5230\u540c\u4e00\u7aef\u53e3\u7684\u64cd\u4f5c<\/p>\n<p>TIME_WAIT\u72b6\u6001\u7684\u4f5c\u7528&#xff1a;\u786e\u4fdd\u6700\u540e\u4e00\u4e2aACK\u80fd\u591f\u5230\u8fbe\u5bf9\u7aef&#xff08;\u5ba2\u6237\u7aef&#xff09;&#xff0c;\u5e76\u8ba9\u7f51\u7edc\u4e2d\u5269\u4f59\u7684\u65e7\u8fde\u63a5\u6570\u636e\u5305\u81ea\u7136\u6d88\u4ea1&#xff0c;\u907f\u514d\u5e72\u6270\u65b0\u8fde\u63a5<\/p>\n<p>\u89e3\u51b3\u65b9\u6cd5&#xff1a;\u901a\u8fc7\u8bbe\u7f6e\u5957\u63a5\u5b57\u9009\u9879SO_REUSEADDR&#xff0c;\u53ef\u4ee5\u5141\u8bb8\u670d\u52a1\u5668\u5728\u7aef\u53e3\u5904\u4e8eTIME_WAIT\u72b6\u6001\u65f6\u91cd\u65b0\u7ed1\u5b9a\u5230\u8be5\u7aef\u53e3<\/p>\n<p>int opt &#061; 1;<br \/>\nsetsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &amp;opt, sizeof(opt)); <\/p>\n<h2 id=\"4.%E4%BF%A1%E5%8F%B7%E5%A4%84%E7%90%86%E4%B8%8E%E5%86%99%E5%A4%B1%E8%B4%A5\">4.\u4fe1\u53f7\u5904\u7406\u4e0e\u5199\u5931\u8d25<\/h2>\n<p>SIGPIPE\u4fe1\u53f7&#xff1a;\u5f53\u5bf9\u7aef\u5173\u95ed\u8fde\u63a5\u540e&#xff0c;\u7ee7\u7eed\u5411\u8be5\u8fde\u63a5\u5199\u5165\u6570\u636e&#xff0c;\u5185\u6838\u4f1a\u53d1\u9001SIGPIPE\u4fe1\u53f7&#xff0c;\u9ed8\u8ba4\u884c\u4e3a\u662f<span style=\"color:#fe2c24\">\u7ec8\u6b62\u8fdb\u7a0b<\/span>\u3002\u901a\u5e38\u9700\u8981\u5ffd\u7565\u6216\u5904\u7406\u8be5\u4fe1\u53f7<\/p>\n<p> signal(SIGPIPE, SIG_IGN); <\/p>\n<p>\u89e6\u53d1\u573a\u666f&#xff1a;\u6700\u5e38\u89c1\u4e8e\u7f51\u7edc\u7f16\u7a0b\u4e2d&#xff0c;\u5ba2\u6237\u7aef\u5173\u95ed\u8fde\u63a5\u540e&#xff0c;\u670d\u52a1\u5668\u4ecd\u5c1d\u8bd5\u5199\u5165\u6570\u636e<\/p>\n<p>\u5e38\u89c1\u505a\u6cd5\u662f\u5728\u670d\u52a1\u5668\u521d\u59cb\u5316\u65f6\u8c03\u7528\u00a0signal(SIGPIPE, SIG_IGN)&#xff0c;\u5728\u5173\u952e\u5199\u5165\u64cd\u4f5c\u540e\u68c0\u67e5\u00a0errno &#061;&#061; EPIPE&#xff0c;\u5904\u7406\u8fde\u63a5\u65ad\u5f00\u903b\u8f91<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u76ee\u5f55<br \/>\n1\u3001TCP\u670d\u52a1\u5668-\u5ba2\u6237\u7aef\u57fa\u672c\u6a21\u578b<br \/>\n1.1.\u670d\u52a1\u5668\u521d\u59cb\u5316&#xff1a;\u88ab\u52a8\u76d1\u542c\u51c6\u5907<br \/>\n1.2.\u8fde\u63a5\u5efa\u7acb&#xff1a;\u4e09\u6b21\u63e1\u624b&#xff08;\u540c\u6b65\u5e8f\u5217\u53f7\u4e0e\u786e\u8ba4\u901a\u4fe1\u80fd\u529b&#xff09;<br \/>\ntelnet<br 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