[Unbound-users] Parent Child Disagreement Redux

Hauke Lampe lampe at hauke-lampe.de
Tue Jul 20 21:24:50 UTC 2010

On 07/20/2010 10:14 PM, Robert Edmonds wrote:

> what am i missing?  the only problem i see is that the nameservers for
> www.us.hsbc.com (broken loadbalancers?) don't respond to qtype=NS and
> some other qtypes, e.g. MX and TXT.  but they do send NOERROR for
> qtype=AAAA.

Not responding to NS records would be bad enough. To make it worse, the
nameservers only respond to all-lowercase queries.

$ dig +short www.us.hsbc.com @

$ dig +short wwW.Us.hsBc.cOm @
;; connection timed out; no servers could be reached

That breaks 0x20 randomization ("use-caps-for-id: yes").


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