Wireshark-users: [Wireshark-users] UDP port range in Tshark

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From: Boaz Galil <boaz20@xxxxxxxxx>
Date: Tue, 1 Dec 2009 19:26:14 +0200
Hi Experts,
 
 
I want to run Tshark command that will capture packets according to port range.

When I am using the filter " -f "host x.x.x.x  and  ((tcp [2:2] >= 20 and tcp [2:2] <= 80) or (tcp [0:2] >= 20 and  tcp [0:2] <= 80))" I am capturing the TCP packets with no problems.

 

The problem is  when I want to use the same command for UDP e.g : “" -f "host x.x.x.x  and  ((udp [2:2] >= 20 and udp [2:2] <= 80) or (udp [0:2] >= 20 and  udp [0:2] <= 80))" I am not getting any error but I am also not getting any results inside the packet capture file.



--
Boaz.