In message <878vupuiu0.fsf@mid.deneb.enyo.de>, Florian Weimer writes:
* William Herrin:
Anyone else having trouble with .gov DNS failing with edns-udp-size set to 512?
You need an UDP size of at least 1220 for DNSSEC, see RFC 3226, section 3. A query that advertises a smaller buffer size is non-compliant. BIND will send such queries, but this is a controversial feature.
This has been noted before, for example:
From: Mark Andrews <marka@isc.org> Subject: [dnsext] Failure to add glue MUST cause TC to be set. To: dnsext@ietf.org Date: Sun, 20 Feb 2011 08:07:15 +1100 Message-Id: <20110219210716.72943A5602B@drugs.dv.isc.org>
And nameservers that don't set TC when they can't fit glue are broken RFC 1034. -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka@isc.org