[111242] in North American Network Operators' Group
Re: Private use of non-RFC1918 IP space
daemon@ATHENA.MIT.EDU (sthaug@nethelp.no)
Mon Feb 2 13:07:12 2009
Date: Mon, 02 Feb 2009 19:06:58 +0100 (CET)
To: darcy@druid.net
From: sthaug@nethelp.no
In-Reply-To: <20090202125935.f351d377.darcy@druid.net>
Cc: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
> > > How does that help? If you are renumbering due to a merger, couldn't
> > > you just agree on separate private space just as easily?
> >
> > It would ensure that you could get the networks to communicate, without
> > IP address conflicts, *before* you started any renumbering.
>
> Can you expand? I assume that everyone understand VPNs so connecting
> over the Internet is not the issue. If you pick a public IP block you
> still have to agree on that block. How is using a public block
> different than agreeing on a private one?
Company A uses public IP block A internally. Company B uses public IP
block B internally. Company A and B later merge, and connect their
networks. No conflict, no renumbering needed (at least not right away).
Compare this with company A and B both using overlapping part of for
instance 192.168.0.0/16, and then merging. Conflict ensues, renumbering
or NATs required in order to connect the networks.
Steinar Haug, Nethelp consulting, sthaug@nethelp.no
