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小編給大家分享一下linux中如何使用tcpdump,相信大部分人都還不怎么了解,因此分享這篇文章給大家參考一下,希望大家閱讀完這篇文章后大有收獲,下面讓我們一起去了解一下吧!
tcpdump
在分析fastcgi程序時(shí),我們利用這個(gè)命令來查看tcp包的情況:
[root@localhost ~]# tcpdump -i lo -s 1500 port 9000 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on lo, link-type EN10MB (Ethernet), capture size 1500 bytes 15:23:16.901004 IP localhost.localdomain.50867 > localhost.localdomain.9000: S 3482201970:3482201970(0) win 32767 <mss 16396,sackOK,timestamp 2296841391 0,nop,wscale 7> 15:23:16.901025 IP localhost.localdomain.9000 > localhost.localdomain.50867: S 3473410857:3473410857(0) ack 3482201971 win 32767 <mss 16396,sackOK,timestamp 2296841391 2296841391,nop,wscale 7> 15:23:16.901039 IP localhost.localdomain.50867 > localhost.localdomain.9000: . ack 1 win 256 <nop,nop,timestamp 2296841391 2296841391> 15:23:16.901150 IP localhost.localdomain.50867 > localhost.localdomain.9000: P 1:1377(1376) ack 1 win 256 <nop,nop,timestamp 2296841391 2296841391> 15:23:16.901170 IP localhost.localdomain.9000 > localhost.localdomain.50867: . ack 1377 win 256 <nop,nop,timestamp 2296841391 2296841391> 15:23:16.901214 IP localhost.localdomain.9000 > localhost.localdomain.50867: P 1:97(96) ack 1377 win 256 <nop,nop,timestamp 2296841391 2296841391> 15:23:16.901222 IP localhost.localdomain.50867 > localhost.localdomain.9000: . ack 97 win 256 <nop,nop,timestamp 2296841391 2296841391> 15:23:16.901236 IP localhost.localdomain.9000 > localhost.localdomain.50867: F 97:97(0) ack 1377 win 256 <nop,nop,timestamp 2296841391 2296841391> 15:23:16.901822 IP localhost.localdomain.50867 > localhost.localdomain.9000: F 1377:1377(0) ack 98 win 256 <nop,nop,timestamp 2296841392 2296841391> 15:23:16.901836 IP localhost.localdomain.9000 > localhost.localdomain.50867: . ack 1378 win 256 <nop,nop,timestamp 2296841392 2296841392>
我們通過這個(gè)命令可以發(fā)現(xiàn)是9000端口主動(dòng)關(guān)閉了連接,這說明在另一端保持連接是沒有效果的。
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