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上周刚刚从fedora13升级到fedora14,刚刚安装完系统的时候,发现有的网站可以打开,有的网站不能打开,重新启动系统后恢复正常,刚刚再次出现这个问题,本来访问网站都是正常的,突然就很多网站打不开,firefox提示访问超时,于是抓包看了一下,发现了奇怪的现象:
测试news.qq.com的80端口,超时,抓包如下:
10:28:19.491634 IP 192.168.0.188.46895 > 119.147.74.18.80: Flags [S], seq 2811511189, win 5840, options [mss 1460,sackOK,TS val 34563148 ecr 0,nop,wscale 6], length 0
10:28:19.505913 IP 119.147.74.18.80 > 192.168.0.188.46895: Flags [S.], seq 1151192811, ack 2811511190, win 5712, options [mss 1440,sackOK,TS val 887380790 ecr 34538912,nop,wscale 2], length 0
10:28:19.506013 IP 192.168.0.188.46895 > 119.147.74.18.80: Flags [R], seq 2811511190, win 0, length 0
10:28:22.495077 IP 192.168.0.188.46895 > 119.147.74.18.80: Flags [S], seq 2811511189, win 5840, options [mss 1460,sackOK,TS val 34566152 ecr 0,nop,wscale 6], length 0
10:28:22.509145 IP 119.147.74.18.80 > 192.168.0.188.46895: Flags [S.], seq 1154196288, ack 2811511190, win 5712, options [mss 1440,sackOK,TS val 887381541 ecr 34538912,nop,wscale 2], length 0
10:28:22.509220 IP 192.168.0.188.46895 > 119.147.74.18.80: Flags [R], seq 2811511190, win 0, length 0
10:28:28.503089 IP 192.168.0.188.46895 > 119.147.74.18.80: Flags [S], seq 2811511189, win 5840, options [mss 1460,sackOK,TS val 34572160 ecr 0,nop,wscale 6], length 0
10:28:28.517329 IP 119.147.74.18.80 > 192.168.0.188.46895: Flags [S.], seq 1160205032, ack 2811511190, win 5712, options [mss 1440,sackOK,TS val 887383043 ecr 34538912,nop,wscale 2], length 0
10:28:28.517409 IP 192.168.0.188.46895 > 119.147.74.18.80: Flags [R], seq 2811511190, win 0, length 0
测试baidu的80端口,正常,抓包如下
10:29:33.040674 IP 192.168.0.188.48287 > 220.181.6.19.80: Flags [S], seq 3958308825, win 5840, options [mss 1460,sackOK,TS val 34636697 ecr 0,nop,wscale 6], length 0
10:29:33.172081 IP 220.181.6.19.80 > 192.168.0.188.48287: Flags [S.], seq 1203562261, ack 3958308826, win 8192, options [mss 1440,nop,nop,sackOK], length 0
10:29:33.172171 IP 192.168.0.188.48287 > 220.181.6.19.80: Flags [.], ack 1, win 5840, length 0
于是我关闭了tcp的时间戳选项,sysctl -w 'net.ipv4.tcp_timestamps=0',马上一切恢复正常,内核问题还是fedora问题?大家用fedora14会这样么? |
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