From mboxrd@z Thu Jan  1 00:00:00 1970
From: Antony Stone <Antony@Soft-Solutions.co.uk>
Subject: Re: Blocking broadcasts
Date: Wed, 10 Jul 2002 20:40:00 +0100
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On Wednesday 10 July 2002 8:36 pm, Faruk Grozdanic wrote:

> Hello,
>
> I am trying to block broadcast IP traffic, that is IP traffic that has
> 255.255.255.255 in the destination feild. I pushed a rule:
>
> iptables -I FORWARD -i eth4 -d 255.255.255.255 -j DROP
>
> and it did not filter these out.

Broadcasts do not go through routers, therefore they will enter the INPUT 
table of your firewall, not the FORWARD table.

 

Antony.