2 May
2011
2 May
'11
1:31 p.m.
* William Herrin:
On Mon, May 2, 2011 at 1:13 PM, Florian Weimer <fw@deneb.enyo.de> wrote:
* 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.
I have "dnssec-enable no;" in my bind config.
It does not seem to have the intended effect.
Were you able to determine from the tcpdump output that DNSSEC was being requested?
[udp sum ok] 10320 [1au] A? www.nsf.gov. ar: . OPT UDPsize=512 OK (40) 11:53:01.690414 IP (tos 0x0, ttl 249, id 28744, offset 0, flags "OK" means that DO=1 was set.