So... is it time to do IPv6 day monthy yet?
marka at isc.org
Mon Jun 20 01:42:34 UTC 2011
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
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 Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: marka at isc.org
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