I want to filter my pcap file by their domains. I mean, I want to see the packets comes on a website ends with ".com", ".org" or ".net".
I tried: dns contains "com", ip.src_host == com, ip.src_host == com, http contains "com". None of them worked correctly.
Assuming it's http web traffic, try http.host contains ".com"
Better yet, try http.host matches "\.com$"
Neither one will require DNS resolution since they search on the web host.
From http://wiki.wireshark.org/DisplayFilters
The matches operator makes it possible to search for text in string fields
and byte sequences using a regular expression, using Perl regular expression
syntax. Note: Wireshark needs to be built with libpcre in order to be able to
use the matches operator.