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Date: Sat, 1 Jul 95 20:32:10 EDT
From: jleppek@suw2k.ess.harris.com (James Leppek)
Message-Id: <9507020032.AA00609@borg.ess.harris.com>
To: freebsd-current@freefall.cdrom.com
Subject: Re: ppp
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I suspect the fact that 0.0.0.0 was invalid is why my provider chose it.
This allows them to detect that someone must be provided an IP
(although I would not mind if they would give me a permanent IP :-) )

I am still unclear as to the reason for the non-intuitive mapping
of 0 to 192.0.0.1 Hmmmmmmm

Ahh well another mystery of life, thats what sources are for :-)

Jim

> From owner-freebsd-current@freefall.cdrom.com Sat Jul  1 14:59:04 1995
> From: J Wunsch <j@uriah.heep.sax.de>
> Subject: Re: ppp
> To: jleppek@harris.com (Jim Leppek)
> Date: Sat, 1 Jul 1995 11:37:32 +0200 (MET DST)
> Cc: freebsd-current@freefall.cdrom.com
> Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch)
> X-Phone: +49-351-2012 669
> X-Mailer: ELM [version 2.4 PL23]
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> 
> As Jim Leppek wrote:
> > 
> > why does a requested IP of 0.0.0.0 get converted to
> > 192.0.0.1 in ipcp.c line 164 ?
> > 
> > 
> >   if (icp->want_ipaddr.s_addr == 0)
> >     icp->want_ipaddr.s_addr = htonl(0xc0000001);
> > 
> > 
> > My provider expected an IP of 0.0.0.0 to indicate a dynamic ppp connection
> > and this "feature" did cause a bit of confusion as a ifaddr 0 0
> > does not really work.
> 
> 0.0.0.0 is an invalid address.  It's used to access any listener on
> the localhost (e.g. you can telnet 0 to your own host), and to
> describe a default route.
> 
> No idea about the 192.0.0.1 however.
> 
> Dynamic PPP address assignment requires valid IP addresses, but those
> addresses must be negotiated by the PPP peers.  This is part of the
> PPP protocol (AFAIK).
> 
> -- 
> cheers, J"org
> 
> joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/
> Never trust an operating system you don't have sources for. ;-)
>