[142177] in North American Network Operators' Group
Re: So... is it time to do IPv6 day monthy yet?
daemon@ATHENA.MIT.EDU (Mark Andrews)
Sun Jun 19 21:43:34 2011
To: Jimmy Hess <mysidia@gmail.com>
From: Mark Andrews <marka@isc.org>
In-reply-to: Your message of "Sun, 19 Jun 2011 13:43:24 EST."
<BANLkTikL4aTchdf9CNeLu_DEjBa+0N4jHw@mail.gmail.com>
Date: Mon, 20 Jun 2011 11:42:34 +1000
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Adding AAAA records for existing nameservers will NOT cause TC to
be set where it would not be set without AAAA records unless you
do a "ANY" lookup of the nameserver where it MAY result in TC being
set.
All current implementations, including named, fail to set TC when
adding glue records to a referral in contradiction on RFC 1034.
This issue has been raised with the IETF dnsext wg. Fixing this
would result in most COM/NET referrals, from the root, setting TC.
Note: recent version of named will add glue which matches the
question section is added to a referral in preference to other glue
and if that glue rrset won't fit it then named will set TC to prevent
the resolution process getting wedged. Usually only EDNS/512 +
DO=1 queries result in a referral which fits the critera to set TC
even then most such queries don't.
Mark
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: marka@isc.org
