From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Rob Sterenborg" <rob@sterenborg.info>
Subject: RE: Port Forwarding
Date: Wed, 3 Dec 2003 09:44:34 +0100
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> iptables -t nat -A PREROUTING -d $EXTERNALIP_1 -s 
> some_external_IP -p 47 -j
> DNAT --to 192.168.0.19
> 
> How to add more source addresses which will be able to connect?

Add more rules like these that allow it.
Or maybe you compiled a new kernel with netfilter iprange support.
http://www.netfilter.org/documentation/pomlist/pom-combined.html#iprange


Gr,
Rob