[111250] in North American Network Operators' Group
Re: Private use of non-RFC1918 IP space
daemon@ATHENA.MIT.EDU (sthaug@nethelp.no)
Mon Feb 2 13:55:55 2009
Date: Mon, 02 Feb 2009 19:55:49 +0100 (CET)
To: darcy@druid.net
From: sthaug@nethelp.no
In-Reply-To: <20090202133047.9ecb7d82.darcy@druid.net>
Cc: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
> > Company A uses public IP block A internally. Company B uses public IP
>
> OK, so we start out with a bad network design then.
No. We start with blocks A and B which are both properly allocated by
the relevant addressing authorities.
> > block B internally. Company A and B later merge, and connect their
> > networks. No conflict, no renumbering needed (at least not right away).
>
> Maybe. What if they both happened to choose 1.2.3.4/8? Is this just a
> matter of decreasing the odds of a conflict? It still seems like bad
> network management to me.
My assumption throughout this whole discussion, which clearly has not
been understood, is that the public IP block used internally is a
properly allocated by the relevant addressing authority. That is, for
me, the whole point of using public addresses to guarantee uniqueness.
Steinar Haug, Nethelp consulting, sthaug@nethelp.no
