[dns-operations] Unexpected behaviour from the B root servers?

[Duane Wessels]

On Mon, 26 Feb 2007, Paul Vixie said:

>> Feb 26 09:59:50 Mail named[38107]: checkhints: view mail_recursive: \
>> 	b.root-servers.net/A (192.228.79.201) missing from hints
>> Feb 26 09:59:50 Mail named[38107]: checkhints: view mail_recursive: \
>> 	b.root-servers.net/A (128.9.0.107) extra record in hints
>
> if it's load balancing and/or anycast, then not every priming query sent to
> "B" is going to be answered by the same server.  does anyone have a tcpdump
> showing a response to a priming query that has this other address for B?

Looks to me like there are two separate issues here.

(1) Your syslog output makes me think that someone has an outdated
hints file.  128.9.0.107 is B's old address, 192.228.79.201 is the
new one.

(2) Unrelated to that, someone noticed that the response source
does not match the query destination.  I cannot reproduce it but I
wouldn't say that I tried very hard.  Perhaps the load balancer
fails to translate the address when it becomes overloaded or under
some other interesting condition?

Duane W.