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bridge between ppp and ethernet - 1 IP address and assign it to another

To: netdev@xxxxxxxxxxx
Subject: bridge between ppp and ethernet - 1 IP address and assign it to another host
From: bert hubert <ahu@xxxxxxx>
Date: Sat, 5 Mar 2005 23:04:30 +0100
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Hi people,

I have an application that wants a Real IP Address, but for a variety of
good reasons, I can't connect the machine to the internet directly.

So, I need this:

DSL - Linux - Windows PC

Where I need the Windows PC to think it has the real single IP addres
assigned to me by the DSL provider. I run PPTP on the Linux box, which
should not touch traffic for that IP address.

Now I know that several DSL routers are capable of this stunt, so we should
be able to do this too. But how?

Linux is pretty stubborn in routing packets for its own IP address elsewhere
(rightfully so). I previously spent some time on this with a lot of
SNAT/DNAT trickery but it is not very pleasing, nor did it work.

What we're trying to do is a lot like building a bridge between ethernet and
ppp, but not quite.

Anybody have ideas? If we find something I'll post it on http://lartc.org.

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