21.2 超时与重传的简单例子

node1:/root#telnet 1.1.1.1 discard
Trying 1.1.1.1...
telnet: connect to address 1.1.1.1: Connection timed out
node1:/root#

node1:/root#tcpdump -S -i eth1 '((tcp) and  (port 9) )'
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes


19:14:28.656150 IP node1.46729 > 1.1.1.1.discard: Flags [S], seq 2645190984, win 10240, options [mss 1024,sackOK,TS val 13800765 ecr 0,nop,wscale 6], length 0
19:14:29.656021 IP node1.46729 > 1.1.1.1.discard: Flags [S], seq 2645190984, win 10240, options [mss 1024,sackOK,TS val 13801765 ecr 0,nop,wscale 6], length 0
19:14:31.656462 IP node1.46729 > 1.1.1.1.discard: Flags [S], seq 2645190984, win 10240, options [mss 1024,sackOK,TS val 13803765 ecr 0,nop,wscale 6], length 0
19:14:35.656719 IP node1.46729 > 1.1.1.1.discard: Flags [S], seq 2645190984, win 10240, options [mss 1024,sackOK,TS val 13807765 ecr 0,nop,wscale 6], length 0
19:14:43.657677 IP node1.46729 > 1.1.1.1.discard: Flags [S], seq 2645190984, win 10240, options [mss 1024,sackOK,TS val 13815766 ecr 0,nop,wscale 6], length 0
19:14:59.658790 IP node1.46729 > 1.1.1.1.discard: Flags [S], seq 2645190984, win 10240, options [mss 1024,sackOK,TS val 13831767 ecr 0,nop,wscale 6], length 0