Malformed response asking for SRV records

[Barry Margolin]

In article <caqgmj$mo2$1 at sf1.isc.org>,
 "Humes, David  G." <David.Humes at jhuapl.edu> wrote:

> We've noticed a situation recently where a remote name server is sending
> what appear to be malformed response to queries for external SRV records.
> Here's an example:
> 
> 1.  Our DNS server sends request for SRV record
> 08:32:00.828185 128.244.197.32.53 > 216.52.184.230.53:  [udp sum ok] 44929
> [1au] SRV ?
> _ldap._tcp.3c73ad35-bf08-471e-b10e-4445085745b7.domains._msdcs.chemimage.com
> . . OPT  UDPsize=2048 (105) (DF) (ttl 252, id 57663, len 133)
> 
> 2.  Remote server responds.  Transaction ID=0, QR=0, RCODE=02
> 08:32:00.875685 216.52.184.230.53 > 128.244.197.32.53:  [udp sum ok] 0
> [b2&3=0x2] [0q] (12) (ttl 112, id 38777, len 40)

It looks like your server is making use of EDNS0 extensions, but this is 
confusing the remote server.  Try turning this off and see if it helps.

-- 
Barry Margolin, barmar at alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***