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Linux----Small tcpdump

Source: Internet
Author: User
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1, by grasping the package to determine the approximate number of visits

#time tcpdump-nn-i eth0 ' tcp[tcpflags] = Tcp-syn '-C 10000 >/dev/null

According to the real time to determine the amount of traffic, if the value is very small, indicating a large number of visits.

2, through the Tcpdump capture packet analysis ETHERNET-IP-TCP-UDP

  • TCP Packet Structure-[Ethernet header [IP header [TCP header [DATA]]]
  • UDP packet Structure-[Ethernet header [IP header [UDP header [DATA]]]

#tcpdump-I eth0 Port 80-xx

Linux----Small tcpdump

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