“`” \u53c2\u8003\u56de\u7b54\uff1a<\/p>\n
1\uff09TCP\u8fde\u63a5\uff08\u4e09\u6b21\u63e1\u624b\uff09\u8fc7\u7a0b\uff1a<\/p>\n
\u5ba2\u6237\u7aefA\uff1a\u53d1\u9001SYN\u8fde\u63a5\u62a5\u6587\uff0c\u5e8f\u5217\u53f7\u4e3ax\uff0c\u8fdb\u5165SYNC-SENT\u72b6\u6001\u3002<\/p>\n
\u670d\u52a1\u7aefB\uff1a\u53d1\u9001SYN\u8fde\u63a5\u786e\u8ba4\u62a5\u6587\uff08SYN=1\uff0cACK = 1\uff09\uff0c\u5e8f\u5217\u53f7\u4e3ay\uff08seq = y\uff09\uff0c\u786e\u8ba4\u62a5\u6587x\uff08ack = x + 1\uff09\uff0c\u8fdb\u5165SYNC-RCVD\u72b6\u6001\u3002<\/p>\n
\u5ba2\u6237\u7aefA\uff1a\u53d1\u9001ACK\u786e\u8ba4\u62a5\u6587\uff08ACK = 1\uff09\uff0c\u5e8f\u5217\u53f7\u4e3ax+1\uff08seq = x + 1\uff09\uff0c\u786e\u8ba4\u62a5\u6587y+1\uff08ack = y + 1\uff09\uff0c\u8fdb\u5165ESTABLISHED\u72b6\u6001\u3002<\/p>\n
\u670d\u52a1\u5668B\uff1a\u6536\u5230\u540e\u8fdb\u5165ESTABLISHED\u72b6\u6001\u3002<\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/uploadfiles.nowcoder.com\/images\/20190315\/308571_1552654514757_B2186A0EB2E4E9A381061A1CC4706248""><\/p>\n
2\uff09\u4e09\u6b21\u63e1\u624b\u539f\u56e0\uff1a<\/p>\n
\u4e09\u6b21\u63e1\u624b\u662f\u4e3a\u4e86\u9632\u6b62\uff0c\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u62a5\u6587\u5728\u7f51\u7edc\u6ede\u7559\uff0c\u5ba2\u6237\u7aef\u8d85\u65f6\u91cd\u4f20\u4e86\u8bf7\u6c42\u62a5\u6587\uff0c\u670d\u52a1\u7aef\u5efa\u7acb\u8fde\u63a5\uff0c\u4f20\u8f93\u6570\u636e\uff0c\u91ca\u653e\u8fde\u63a5\u4e4b\u540e\uff0c\u670d\u52a1\u5668\u53c8\u6536\u5230\u4e86\u5ba2\u6237\u7aef\u6ede\u7559\u7684\u8bf7\u6c42\u62a5\u6587\uff0c\u5efa\u7acb\u8fde\u63a5\u4e00\u76f4\u7b49\u5f85\u5ba2\u6237\u7aef\u53d1\u9001\u6570\u636e\u3002<\/p>\n
\u670d\u52a1\u5668\u5bf9\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u8fdb\u884c\u56de\u5e94(\u7b2c\u4e8c\u6b21\u63e1\u624b)\u540e\uff0c\u5c31\u4f1a\u7406\u6240\u5f53\u7136\u7684\u8ba4\u4e3a\u8fde\u63a5\u5df2\u5efa\u7acb\uff0c\u800c\u5982\u679c\u5ba2\u6237\u7aef\u5e76\u6ca1\u6709\u6536\u5230\u670d\u52a1\u5668\u7684\u56de\u5e94\u5462\uff1f\u6b64\u65f6\uff0c\u5ba2\u6237\u7aef\u4ecd\u8ba4\u4e3a\u8fde\u63a5\u672a\u5efa\u7acb\uff0c\u670d\u52a1\u5668\u4f1a\u5bf9\u5df2\u5efa\u7acb\u7684\u8fde\u63a5\u4fdd\u5b58\u5fc5\u8981\u7684\u8d44\u6e90\uff0c\u5982\u679c\u5927\u91cf\u7684\u8fd9\u79cd\u60c5\u51b5\uff0c\u670d\u52a1\u5668\u4f1a\u5d29\u6e83\u3002<\/p>\n
3\uff09 TCP\u91ca\u653e\uff08\u56db\u6b21\u5206\u624b\uff09\u8fc7\u7a0b\uff1a<\/p>\n
\u670d\u52a1\u7aefA\uff1a\u53d1\u9001FIN\u62a5\u6587\uff08FIN = 1\uff09\uff0c\u5e8f\u5217\u53f7\u4e3au\uff08seq = u\uff09\uff0c\u8fdb\u5165FIN-WAIT 1\u72b6\u6001\u3002<\/p>\n
\u5ba2\u6237\u7aefB\uff1a\u53d1\u9001ACK\u786e\u8ba4\u62a5\u6587\uff08ACK = 1\uff09\uff0c\u5e8f\u5217\u53f7\u4e3av\uff08seq = v\uff09\uff0c\u786e\u8ba4\u62a5\u6587u\uff08ack = u + 1\uff09\uff0c\u8fdb\u5165CLOSE-WAIT\u72b6\u6001\uff0c\u7ee7\u7eed\u4f20\u9001\u6570\u636e\u3002<\/p>\n
\u670d\u52a1\u7aefA\uff1a\u6536\u5230\u4e0a\u8ff0\u62a5\u6587\u8fdb\u5165FIN-WAIT2\u72b6\u6001\uff0c\u7ee7\u7eed\u63a5\u53d7B\u4f20\u8f93\u7684\u6570\u636e\u3002<\/p>\n
\u5ba2\u6237\u7aefB\uff1a\u6570\u636e\u4f20\u8f93\u5b8c\u6bd5\u540e\uff0c\u53d1\u9001FIN\u62a5\u6587\uff08FIN = 1\uff0cACK = 1\uff09\uff0c\u5e8f\u5217\u53f7\u4e3aw\uff08seq = w\uff09\uff0c\u786e\u8ba4\u62a5\u6587u\uff08ack = u + 1\uff09\uff0c\u8fdb\u5165LAST-ACK\u72b6\u6001\u3002<\/p>\n
\u670d\u52a1\u7aefA\uff1a\u53d1\u9001ACK\u786e\u8ba4\u62a5\u6587\uff08ACK = 1\uff09\uff0c\u5e8f\u5217\u53f7\u4e3au+1\uff08seq = u + 1\uff09\uff0c\u786e\u8ba4\u62a5\u6587w\uff08ack = w + 1\uff09\uff0c\u8fdb\u5165TIME-WAIT\u72b6\u6001\uff0c\u7b49\u5f852MSL\uff08\u6700\u957f\u62a5\u6587\u6bb5\u5bff\u547d\uff09\uff0c\u8fdb\u5165CLOSED\u72b6\u6001\u3002<\/p>\n
\u5ba2\u6237\u7aefB\uff1a\u6536\u5230\u540e\u4e0a\u8ff0\u62a5\u6587\u540e\u8fdb\u5165CLOSED\u72b6\u6001\u3002<\/p>\n
4\uff09\u4e3a\u4ec0\u4e48TCP\u534f\u8bae\u7ec8\u6b62\u94fe\u63a5\u8981\u56db\u6b21\uff1f<\/p>\n
1\u3001\u5f53\u5ba2\u6237\u7aef\u786e\u8ba4\u53d1\u9001\u5b8c\u6570\u636e\u4e14\u77e5\u9053\u670d\u52a1\u5668\u5df2\u7ecf\u63a5\u6536\u5b8c\u4e86\uff0c\u60f3\u8981\u5173\u95ed\u53d1\u9001\u6570\u636e\u53e3\uff08\u5f53\u7136\u786e\u8ba4\u4fe1\u53f7\u8fd8\u662f\u53ef\u4ee5\u53d1\uff09\uff0c\u5c31\u4f1a\u53d1FIN\u7ed9\u670d\u52a1\u5668\u3002<\/p>\n
2\u3001\u670d\u52a1\u5668\u6536\u5230\u5ba2\u6237\u7aef\u53d1\u9001\u7684FIN\uff0c\u8868\u793a\u6536\u5230\u4e86\uff0c\u5c31\u4f1a\u53d1\u9001ACK\u56de\u590d\u3002<\/p>\n
3\u3001\u4f46\u8fd9\u65f6\u5019\u670d\u52a1\u5668\u53ef\u80fd\u8fd8\u5728\u53d1\u9001\u6570\u636e\uff0c\u6ca1\u6709\u60f3\u8981\u5173\u95ed\u6570\u636e\u53e3\u7684\u610f\u601d\uff0c\u6240\u4ee5\u670d\u52a1\u5668\u7684FIN\u4e0eACK\u4e0d\u662f\u540c\u65f6\u53d1\u9001\u7684\uff0c\u800c\u662f\u7b49\u5230\u670d\u52a1\u5668\u6570\u636e\u53d1\u9001\u5b8c\u4e86\uff0c\u624d\u4f1a\u53d1\u9001FIN\u7ed9\u5ba2\u6237\u7aef\u3002<\/p>\n
4\u3001\u5ba2\u6237\u7aef\u6536\u5230\u670d\u52a1\u5668\u53d1\u6765\u7684FIN\uff0c\u77e5\u9053\u670d\u52a1\u5668\u7684\u6570\u636e\u4e5f\u53d1\u9001\u5b8c\u4e86\uff0c\u56de\u590dACK\uff0c \u5ba2\u6237\u7aef\u7b49\u5f852MSL\u4ee5\u540e\uff0c\u6ca1\u6709\u6536\u5230\u670d\u52a1\u5668\u4f20\u6765\u7684\u4efb\u4f55\u6d88\u606f\uff0c\u77e5\u9053\u670d\u52a1\u5668\u5df2\u7ecf\u6536\u5230\u81ea\u5df1\u7684ACK\u4e86\uff0c\u5ba2\u6237\u7aef\u5c31\u5173\u95ed\u94fe\u63a5\uff0c\u670d\u52a1\u5668\u4e5f\u5173\u95ed\u94fe\u63a5\u4e86\u3002<\/p>\n
5\uff092MSL\u610f\u4e49\uff1a<\/p>\n
1\u3001\u4fdd\u8bc1\u6700\u540e\u4e00\u6b21\u63e1\u624b\u62a5\u6587\u80fd\u5230B\uff0c\u80fd\u8fdb\u884c\u8d85\u65f6\u91cd\u4f20\u3002<\/p>\n
2\u30012MSL\u540e\uff0c\u8fd9\u6b21\u8fde\u63a5\u7684\u6240\u6709\u62a5\u6587\u90fd\u4f1a\u6d88\u5931\uff0c\u4e0d\u4f1a\u5f71\u54cd\u4e0b\u4e00\u6b21\u8fde\u63a5\u3002<\/p>\n
<pre><code> "“`
\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
“`” \u53c2\u8003\u56de\u7b54\uff1a 1\uff09TCP\u8fde\u63a5\uff08\u4e09\u6b21\u63e1\u624b\uff09\u8fc7\u7a0b\uff1a \u5ba2\u6237\u7aefA\uff1a\u53d1\u9001SYN\u8fde\u63a5\u62a5\u6587\uff0c\u5e8f […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-46677","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/46677","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=46677"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/46677\/revisions"}],"predecessor-version":[{"id":46678,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/46677\/revisions\/46678"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=46677"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=46677"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=46677"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}