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→Filter by protocol
=== Filter by protocol ===
=== Filter by protocol ===
tcpdump icmp
tcpdump icmp
=== Filter by packet size ===
tcpdump less 32
tcpdump greater 64
tcpdump <= 128
=== Read/Write File ===
==== Write ====
tcpdump port 80 -w capture_file
==== Read ====
tcpdump -r capture_file
== Combinations ==
* AND
and or &&
* OR
or or ||
* EXCEPT
not or !
=== traffic from 10.5.2.3 going to any host on port 3389 ===
tcpdump -nnvvS src 10.5.2.3 and dst port 3389
=== Traffic from one network to another ===
tcpdump -nvX src net 192.168.0.0/16 and dst net 10.0.0.0/8 or 172.16.0.0/16
=== non icmp traffic going to a specific ip ===
tcpdump dst 192.168.0.2 and src net and not icmp