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Date: Fri, 7 Feb 1997 19:00:02 +1100 (EST)
From: "Daniel O'Callaghan" <danny@panda.hilink.com.au>
To: Robert Chalmers <robert@nanguo.chalmers.com.au>
cc: bsd <freebsd-questions@freebsd.org>, FreeBSD ISP <freebsd-isp@freebsd.org>
Subject: Re: can ppp work through virtual host?
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On Fri, 7 Feb 1997, Robert Chalmers wrote:

> In other words, can I turn the server .5 into a machine that also
> runs pppd, with pppd thinking its on .4, because I have ifconfig
> setting up a virtual or alias host?
> 
> or...
> 
> Should I turn .5 into a Virtual-Server, and rename and re-IP the
> physical, true machine to be .4, running pppd?
> 
> The PPPD _must_ run as .4. There is no option there.

Basically, just tell pppd that its local IP address is .4.

pppd a.b.c.4:x.x.x.x (substitute remote IP address)

pppd does not care about the status of the IP address w.r.t. other 
interfaces.  It can be used or not used by other interfaces, as aliases 
or not.  Just be careful running gated :-)

Danny