[Unbound-users] unbound and newegg.com

W.C.A. Wijngaards wouter at NLnetLabs.nl
Wed Jun 25 10:02:59 UTC 2008

Hash: SHA1

Hi Robert,

Thank you for the detailed bug report.

In svn trunk rev1137 a fix is in.

The fix, for the curious, is only to mark the newegg server lame if it
responds lame to both the A and AAAA queries. So the users can intermix
A and AAAA queries, with AAAA failing and A working.

Man those newegg servers / load balancers are bad stuff. I just noticed
it completely drops class CH (e.g., version.bind CH TXT) queries too.
This is not a particular problem luckily.

This also fixes www.usps.com by the way. Which seems to be running a
different setup as version.bind CH TXT is answered with a neat NOTIMP
answer (good!).

Best regards,
~   Wouter

Robert Edmonds wrote:
| newegg.com's NS is hosted by ultradns:
| but interestingly ultradns delegates www.newegg.com and
| secure.newegg.com to other servers.
| these servers will answer authoritatively for the A records www and
| secure, but provide root referrals when asked about the AAAA records.
| unbound, when asked about the AAAA then the A record, as a typical
| resolver(3) client will do, responds with SERVFAILs, as it seems the
| referral from the failed AAAA query somehow poisons unbound (see
| attached newegg-fail.log).  when asked for only the A record, unbound
| doesn't receive any bad data and returns the record (see attached
| newegg-success.log).
| bind and dnscache handle this lameness, so include the usual
| new-kid-on-the-block / abuse-of-the-robustness-principle arguments.
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