作弊条：tcpdump的几个flag
- SYN:
'tcp[13] & 2 != 0' - ACK:
'tcp[13] & 16 !=0' - URG:
'tcp[13] & 32 !=0' - PSH:
'tcp[13] & 8 !=0' - RST:
'tcp[13] & 4 !=0' - FIN:
'tcp[13] & 1 !=0' - SYN-ACK:
'tcp[13] = 18'
Ref: A tcpdump Tutorial and Primer
Last modified on 2010-10-13