[BSD:root@mao] ~# tcpdump -i bce0 -n -vv port 80
tcpdump: listening on bce0, link-type EN10MB (Ethernet), capture size 65535 bytes
11:07:44.515819 IP (tos 0x0, ttl 64, id 4922, offset 0, flags [DF], proto TCP (6), length 60)
    10.0.101.3.14436 > 204.152.213.17.80: Flags [S], cksum 0x10dc (incorrect -> 0x59e7), seq 519640890, win 65535, options [mss 1460,nop,wscale 6,sackOK,TS val 3053435013 ecr 0], length 0
11:07:44.716252 IP (tos 0x0, ttl 47, id 0, offset 0, flags [DF], proto TCP (6), length 60)
    204.152.213.17.80 > 10.0.101.3.14436: Flags [S.], cksum 0xd4f2 (correct), seq 1473249240, ack 519640891, win 5792, options [mss 1460,sackOK,TS val 106565699 ecr 3053435013,nop,wscale 4], length 0
11:07:44.716269 IP (tos 0x0, ttl 64, id 4933, offset 0, flags [DF], proto TCP (6), length 52)
    10.0.101.3.14436 > 204.152.213.17.80: Flags [.], cksum 0x10d4 (incorrect -> 0x1585), seq 1, ack 1, win 1040, options [nop,nop,TS val 3053435212 ecr 106565699], length 0
11:07:44.716333 IP (tos 0x0, ttl 64, id 4935, offset 0, flags [DF], proto TCP (6), length 197)
    10.0.101.3.14436 > 204.152.213.17.80: Flags [P.], cksum 0x1165 (incorrect -> 0xdc3d), seq 1:146, ack 1, win 1040, options [nop,nop,TS val 3053435213 ecr 106565699], length 145
11:07:44.760228 IP (tos 0x0, ttl 82, id 58221, offset 0, flags [none], proto TCP (6), length 40)
    204.152.213.17.80 > 10.0.101.3.14436: Flags [R], cksum 0x8f18 (correct), seq 1473249241, win 32701, length 0