From mboxrd@z Thu Jan  1 00:00:00 1970
From: Luigi Corsello <mlreader@lucomp.net>
Subject: Unicast packets to multiple destinations  -only-
Date: Thu, 18 Nov 2004 10:48:35 +0100
Message-ID: <419C6FF3.9070908@lucomp.net>
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To: Netfilter ML <netfilter@lists.netfilter.org>

Hi all,

I got 3 IPs in one interface (ip addr add, not aliasing), and wanted to 
only allow unicast packets to any of them (and/or their subnet in one 
case, to allow broadcasts for the local net).
Aim: no broadcasts, no multicast, spoofing prevention?.

You can't have multiple -d in rules. My quick solution was 3 tables
(this is a sample):

iptables -N ta
iptables -N tb
iptables -N tc

iptables -A tc -d ! $ip3 -j DROP
iptables -A tb -d ! $ip2 -j tc
iptables -A ta -d ! $ip1 -j tb

iptables -A INPUT -j ta

It works, much junk stays out.  All services work.
 From the list point of view, is this insane(a) stupid(b) or clever(c)? 
and why?

Cheers,
/lc