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From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
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Subject: Re: IPFW Antics
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"Tom Servo" <xtomservox@hotpop.com> writes:

> Each time that I see the request dialog come up in my IRC client the request
> times out because I think that my gateway is dropping the request packets
> instead of forwarding them to my IRC machine.  I know that ircd usually runs
> on port 6667 so I am guessing that DCC requests must land in the same area.
> I specified all ports from 6666-7000 to be safe but maybe these are the
> wrong ports???

You'd need to check the IRC docs for that.
Or look at the traffic on the wire; I use tcpdump(1) for that.