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From: Sven Schuster <schuster.sven@gmx.de>
To: netfilter@lists.netfilter.org
Cc: david@atd.es
Subject: Re: mail relay
Date: Thu, 20 Mar 2003 17:00:36 +0100	[thread overview]
Message-ID: <3E79E5A4.50701@gmx.de> (raw)
In-Reply-To: OFF04453C4.ECF4132D-ONC1256CEF.00548382-C1256CEF.00543F77@LocalDomain

david@atd.es wrote:

>
> Hi everybody,
> I would like to know how can I filter the mail relay received in my 
> port 25 with the firewall,..  I want only accept the packets from only 
> one ip, my ISP.
> This is possible this rule with iptables ??


If your mailserver is on the firewall itself, you should give this one a 
try (this is very
basic, one would usually add some more rules, set default policy to 
drop, then even
this rule wouldn't be right anymore):

iptables -A INPUT -p tcp --dport 25 -s ! 1.2.3.4 -j REJECT --reject-with 
tcp-reset


Sven




      parent reply	other threads:[~2003-03-20 16:00 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <OFF04453C4.ECF4132D-ONC1256CEF.00548382-C1256CEF.00543F77@LocalDo main>
     [not found] ` <OFF04453C4.ECF4132D-ONC1256CEF.00548382-C1256CEF.00543F77@LocalDomain>
2003-03-20 15:33   ` mail relay Andreas Czerniak
2003-03-20 15:39   ` Rob Sterenborg
2003-03-20 16:00   ` Sven Schuster [this message]

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