-d option does not listen to the port I choose

[James Hozier <guitarscn1 () yahoo com>]

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?


      

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