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From: Etaoin Shrdlu <shrdlu@unlimitedmail.org>
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Subject: Re: [gentoo-user]  Re: {OT} TCP or UDP?
Date: Tue, 24 Feb 2009 18:51:31 +0100
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On Tuesday 24 February 2009, 18:21, Florian Philipp wrote:
> Nikos Chantziaras schrieb:
> > Grant wrote:
> >> How can I find out whether I should be specifying TCP, UDP, or both
> >> for iptables (shorewall) config?
> >
> > By knowing the application's protocol for which you write the rules
> > for :P [...]   So you have to research a bit to see if the
> > application uses TCP or UDP.
>
>   You can also have a look at /etc/services which lists the more
> common protocols and their ports.

Or even sniff the traffic and see which protocols are used.