[102355] in North American Network Operators' Group
Re: Repotting report
daemon@ATHENA.MIT.EDU (Mark Andrews)
Wed Feb 6 00:54:22 2008
To: "Christopher Morrow" <morrowc.lists@gmail.com>
Cc: nanog@merit.edu
From: Mark Andrews <Mark_Andrews@isc.org>
In-reply-to: Your message of "Wed, 06 Feb 2008 00:31:46 CDT."
<75cb24520802052131t1193fe6dx9bc422efbfeaab21@mail.gmail.com>
Date: Wed, 06 Feb 2008 16:48:56 +1100
Errors-To: owner-nanog@merit.edu
> On Feb 6, 2008 12:11 AM, Mark Andrews <Mark_Andrews@isc.org> wrote:
> >> (from me)
> > >How does a cache-resolver know that it's time to issue a query with edns0?
> >
> > cache-resolver that support EDNS0 will make EDNS0 queries
> > by default. They will fallback to plain DNS if the query
> > fails or they get a response that indicated the authoritative
> > server doesn't support EDNS.
> >
> > BIND's been making EDNS0 queries for ~8 years now. If your
> > cache-resolver doesn't support EDNS it is long past time to
> > upgrade.
> >
>
> excellent, thanks! (as always). Any thoughts on the possible lack of
> resilence from losing 9 server names/ips in the v4 to v6 move? (and I
> realize that later most/all root boxes will have both addresses)
It won't be a issue.
IPv6 capable nameservers are supposed to use EDNS (see IPv6
node requirements). The roots can be tuned to preference
A vs AAAA records. Most/all currently maintained caching
servers support EDNS now or the next release will support
EDNS.
Mark
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark_Andrews@isc.org
