From owner-freebsd-questions  Sun Sep 24 21:42:16 2000
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Date: Sun, 24 Sep 2000 21:42:05 -0700
From: "Crist J . Clark" <cjclark@reflexnet.net>
To: Ben Schumacher <ben@henshaw.net>
Cc: Louis Valentine <bwolf@u.washington.edu>,
	freebsd-questions@FreeBSD.ORG
Subject: Re: Routing UDP Packets...?
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Reply-To: cjclark@alum.mit.edu
References: <000a01c025b0$92716270$382bd080@louisv> <5.0.0.25.2.20000923231412.01f65380@pop.henshaw.net>
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On Sat, Sep 23, 2000 at 11:21:43PM -0600, Ben Schumacher wrote:
> At 03:49 PM 9/23/2000 -0700, Louis Valentine wrote:
> >   Hey, I'm trying to setup my FreeBSD box with 4.1-RELEASE to act as a 
> > UDP router.  I only have one interface, my ethernet card, and what I want 
> > to do is listen for UDP packets on a port, say 20000, and redirect these 
> > packets to some destination, say my.host.com:20000. So far I have:
> >
> >1. Recompiled the kernel with the IPFIREWALL and IPDIVERT options.
> >2. Set firewall_enable=YES, firewall_type=OPEN, gateway_enable=YES, 
> >natd_enable=YES, natd_interface=de0 in rc.conf.
> >3. Added natd to /etc/services.
> >3. Started natd with "-redirect_port udp my.host.com:20000 20000 -n de0".
> >
> >   I have then tried sending a UDP packet to the machine at that port, but 
> > it doesn't seem to be listening properly. I tried running natd with the 
> > -verbose option to debug it, but it never shows any output. Please help!
> 
> Louis-
> 
> Trying compiling the kernel with IPFIREWALL_FORWARD instead of 
> IPDIVERT.  Then add a firewall rule that forwards the packets.  Ex:
> 
> ipfw add fwd my.host.com,20000 udp from any to local.ip.address 20000
> 
> I'm not 100% certain that this will work, but I believe it will.

No it won't. That is not what ipfw forwarding does.
-- 
Crist J. Clark                           cjclark@alum.mit.edu


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