Hi--

On Oct 17, 2011, at 3:37 PM, Karl Auer wrote:
> To see it, do (for example):
> 
>   dig+trace biplane.com.au ns
> 
> Some such queries return correctly, some end up in a BHR loop.

I don't see a "bad horizontal referral" being returned anywhere, but I do get 
errors against ppsdns6.pps.com.au since that appears to be an IPv6 only 
nameserver:

% dig +trace biplane.com.au ns                                                  
                                                

; <<>> DiG 9.6.0-APPLE-P2 <<>> +trace biplane.com.au ns
;; global options: +cmd
[ ... ]
;; Received 412 bytes from 58.65.253.73#53(b.au) in 89 ms

biplane.com.au.         14400   IN      NS      ppsdns6.pps.com.au.
biplane.com.au.         14400   IN      NS      ppsdns2.pps.com.au.
biplane.com.au.         14400   IN      NS      ppsdns1.pps.com.au.
biplane.com.au.         14400   IN      NS      ppsdns4.pps.com.au.
;; Received 184 bytes from 69.36.146.34#53(o.au) in 108 ms

dig: couldn't get address for 'ppsdns6.pps.com.au': not found

I don't believe the world is ready for IPv6-only nameservers, but YMMV:

  http://www.dnsvalidation.com/reports/4e9cb0d37d79ee5fbe000008

Regards,
-- 
-Chuck

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