Monitoring multiple ports in tcpdump

I am trying to find a way to read multiple ports using tcpdump.开发者_开发知识库 Suppose I have two ports, p1 and p2, and I want to read the traffic moving through both ports simultaneously. Is there any way to do it using tcpdump or will I have to use some other tool?

Basically I am running a proxy server which is running on some port. I want to read the traffic moving through this port as well traffic moving through port 80(HTTP).

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tcpdump port 80 or port 3128

or, alternatively,

tcpdump port '(80 or 443)'

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if you want to filter ports based on the range then use portrange.

E.g:

tcpdump -an portrange 1-25

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You can also select an interface (change -i any to -i en0 for example) and the communication protocol :

tcpdump -i any 'udp port 1812 or tcp port 1813'