TCPDUMP Example

On 17/01/2014, in Genel, by Specialist

To print IP broadcast or multicast packets that were not
sent via ethernet broadcast or multicast: tcpdump ‘ether[0] & 1 = 0 and ip[16] >= 224’

To print all ICMP packets that are not echo
requests/replies (i.e., not ping packets): tcpdump ‘icmp[icmptype] != icmp-echo and icmp[icmptype] != icmp-echoreply’

For example, `ether[0] & 1 != 0′ catches all multicast traffic. The expression `ip[0]  &0xf  !=  5′ catches all IP packets with options. The expression `ip[6:2] & 0x1fff =0′ catches only unfragmented datagrams and frag zero of fragmented datagrams.

 

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