James Hozier wrote:
tshark -i en1 -tad -lnx -d tcp.port==7001,irc -R 'irc'
When I start to see the packets on my screen, they are from port 6667,
not from port 7001. Anything from port 7001 I do not see, but it listens
to port 6667 for some reason? Why does it do this?
-d ... means decode any traffic on tcp port 7001 as irc;
(it does *not* mean 'listen on this port)
-R .. means filter on irc packets.
So: I think the above means filter on irc:
- on port 6667 which is the normal tcp port for irc
(from looking at the irc dissector code);
- and on on port 7001;
If you want to just see port 7001 traffic you should use
-R 'tcp.port==7001'