From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?windows-1252?Q?J=F6rg_Harmuth?= <harmuth@mnemon.de>
Subject: Re: port filtering
Date: Thu, 02 Jun 2005 17:30:17 +0200
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Hi,

Eduardo Spremolla schrieb:
> I suppose you have a firewall that allow outgoing traffic on port 21 ?
> or is incoming?
> 
> Any way you can't tell if the traffic on port 21 if ftp , telnet or http
> without looking a hi layers protos. Don't know of any support for that
> in netfilter. May be you need to setup a transparent proxy.
> 
May be this is of use:

http://l7-filter.sourceforge.net/L7-HOWTO-Netfilter

Have a nice time,

Joerg