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Date:      Sat, 23 Sep 2000 23:21:43 -0600
From:      Ben Schumacher <ben@henshaw.net>
To:        "Louis Valentine" <bwolf@u.washington.edu>, <freebsd-questions@FreeBSD.ORG>
Subject:   Re: Routing UDP Packets...?
Message-ID:  <5.0.0.25.2.20000923231412.01f65380@pop.henshaw.net>
In-Reply-To: <000a01c025b0$92716270$382bd080@louisv>

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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.

Hope this helps,
- Ben Schumacher



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