From mboxrd@z Thu Jan  1 00:00:00 1970
From: Willy TARREAU <willy@w.ods.org>
Subject: Re: Invalid friggen argument
Date: Sun, 12 Oct 2003 13:08:47 +0200
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To: Herman <Herman@AerospaceSoftware.com>
Cc: netfilter@lists.netfilter.org

Hi !

On Sun, Oct 12, 2003 at 01:41:15AM -0600, Herman wrote:
 
> Now, I get this result with iptables 1.2.7a-2mdk and with 1.2.9rc1:
> 
> # iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 6390 \
>  -j DNAT --to 192.168.10.245
> iptables: Invalid argument

your kernel might be too old and incompatible with these more recent versions.
I got the same when upgrading from iptables-1.2.4 to 1.2.5, IIRC.

Willy