*BSD News Article 78025


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From: Ken Bigelow <kbigelow@www.play-hookey.com>
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: IP forwarding
Date: Tue, 10 Sep 1996 21:18:30 +0000
Organization: Erol's Internet Services
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Brian Somers wrote:
> 
> On a machine w/ 3 interfaces, is there any way to forward IP between two
> of them, but not the third ?  For example, I have two subnets & a ppp
> to the internet - I want the subnets to talk, but not send crap onto
> the 'net.
> 

As long as a packet was specifically addressed to the 'other' subnet, I
wouldn't expect it to go over the PPP link. As near as I can tell,
anything I send internally to one of the other computers on my subnet
stays here, although my primary server has GATEWAY set to "YES." I think
it only forwards packets that don't already have a local home.

Or is that just wishful thinking?
-- 

Ken

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