[dns-operations] Strange Responses for 20.in-addr.arpa

[Mark Andrews]

> > ns1.csc.com and ns2.csc.com respond to queries for KEY, NXT and SIG RRs 
> > but time out
> > for DS, DNSKEY, NSEC, RRSIG and SSHFP RRs, so one guess is that there is a 
> > middlebox
> > of some description blocking queries for RR types that it doesn't know 
> > about.
> 
> In addition, NS[12].CSC.COM aren't authoritative for 20.in-addr.arpa, but
> for $N.20.in-addr.arpa with N = [0 .. 255].
> 
> -Peter

	Which indicates a delegation problem as 20.in-addr.arpa is
	delegated to those servers.  ipadmin at csc.com has been CC'd
	this response.

20.in-addr.arpa.        86400   IN      NS      NS2.CSC.COM.
20.in-addr.arpa.        86400   IN      NS      NS1.CSC.COM.
;; Received 76 bytes from 128.8.10.90#53(D.ROOT-SERVERS.NET) in 245 ms

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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org