From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Rob Sterenborg" <rob@sterenborg.info>
Subject: RE: REJECT target not as policy
Date: Mon, 20 Aug 2007 21:11:53 +0200
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References: <20070820135206.GA18644@bart.bertram-scharpf.homelinux.com>	<200708201608.39032.r.laban@ism.nl>	<46C9B8A2.5040201@plouf.fr.eu.org><20070820174642.GA22613@bart.bertram-scharpf.homelinux.com>
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>> On an other list I was told it were a good idea to set
>> REJECT as policy.
>
> I could be a good idea if it was possible. Maybe the person who told
> you mixed up iptables and ipchains, its "predecessor" for 2.2
> kernels. IIRC ipchains allowed REJECT as a policy.

You could emulate a REJECT policy by having this as the very last rules:

$ipt -A INPUT -p tcp -j REJECT --reject-with tcp-reset
$ipt -A INPUT -j REJECT

(I thought it was like this..)
But, if you dynamically add rules then you have to take care of at/from
which position you insert/delete them.