[136122] in North American Network Operators' Group
Re: Using IPv6 with prefixes shorter than a /64 on a LAN
daemon@ATHENA.MIT.EDU (Jack Bates)
Tue Feb 1 10:43:52 2011
Date: Tue, 01 Feb 2011 09:43:47 -0600
From: Jack Bates <jbates@brightok.net>
To: Tim Franklin <tim@pelican.org>
In-Reply-To: <9175394.51296573804403.JavaMail.root@jennyfur.pelican.org>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 2/1/2011 9:23 AM, Tim Franklin wrote:
> I really,*really* expect my CPE router*not* to remove global
> addresses from the LAN interface(s) when the link to the Internet
> goes down. My internal services should go on working with their
> global addresses. This is how my tunneled IPv6 works today.
>
> Am I being an unreasonable engineer in this respect?
This depends. Will you have a static assignment? What will be the
lifetime values issued by your ISP? Granted, You should be able to
maintain them at least 2 hours, though in a multiple router scenario,
I'm not sure how well they'll take to routing unpreferred prefixes.
ULA isn't a bad thing. It also doesn't interfere with your GUA. There's
really no reason NOT to have ULA in CPE devices. If your DSL is down for
a day or two, do you really want to worry about addressing? Do you want
to connect to the Internet before you can have addressing?
Jack
