Monitoring multiple ports in tcpdump

Question

I am trying to find a way to read multiple ports using tcpdump. 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).

Answer 1

tcpdump port 80 or port 3128

Answer 2

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

E.g:

tcpdump -an portrange 1-25