From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alin Nastac <mrness@technosoft.ro>
Subject: Re: iptables question - how to securely allow *just* outgoing smtp
Date: Tue, 25 Jun 2002 09:55:46 +0300
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References: <20020621083228.A21833@spawar.navy.mil> <200206211535.g5LFZbU03196@vulcan.rissington.net> <20020622102824.A32585@spawar.navy.mil>
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To: Christian Seberino <seberino@spawar.navy.mil>
Cc: Antony Stone <Antony@Soft-Solutions.co.uk>, netfilter@lists.samba.org

Christian Seberino wrote:

> I *could* define $SSH_PORT and $SMPT_PORT but
> doesn't iptables recognize ssh and smtp /already/
> as 22 and 25?

iptables recognise all ports names from /etc/services. You could use
--dport ssh instead --dport 22. Still, you must add before that -p tcp.
Without that, iptables cannot interpret --dport.