[97113] in North American Network Operators' Group
Re: ULA BoF
daemon@ATHENA.MIT.EDU (Fred Baker)
Fri Jun 1 19:28:30 2007
In-Reply-To: <2AEB03D1-6DF9-4D00-B1ED-413FB8390DAF@muada.com>
Cc: Joel Jaeggli <joelja@bogus.com>, NANOG list <nanog@nanog.org>
From: Fred Baker <fred@cisco.com>
Date: Fri, 1 Jun 2007 16:27:21 -0700
To: Iljitsch van Beijnum <iljitsch@muada.com>
Errors-To: owner-nanog@merit.edu
On Jun 1, 2007, at 4:05 PM, Iljitsch van Beijnum wrote:
> Solution: new type of local addresses that doesn't require any
> router magic to keep the packets within the site, and is globally
> unique so network merging isn't an issue.
But ULAs *do* require router magic. They require a policy to be in
place that causes them to not be advertised unless the policy is
overridden, and a policy that doesn't believe them even if they are
mistakenly advertised. The simple way to accomplish this is to either
(small installations) list the prefixes one will advertise or accept,
or (larger installations) explicitly deny ULAs before permitting
those in the relevant communities (send side) or accepting anything
received.
