Compression / Pointers on returned queries

Brian Feeny bfeeny at
Thu Jun 5 02:48:39 UTC 2008

> -----Original Message-----
> From: Mark_Andrews at [mailto:Mark_Andrews at]
> Sent: Wednesday, June 04, 2008 9:57 PM
> To: Brian Feeny
> Cc: bind-users at
> Subject: Re: Compression / Pointers on returned queries
> 	Why do you care?  As long as you get the answer in a single
> 	packet it makes little to no difference.  Also why are you
> 	asking recurive queries?  If you want to test authoritative
> 	servers then you should be making non-recursive queries.
> 	The server should also be configured not to accept recursive
> 	queries from anywhere.

Because a response of >512 bytes causes pain because of firewalls/etc that
may drop the packets by default.
So the goal would be a <512 byte response, which is what happens when the
compression is used.

I re-did the query without recursion, but it's a similar result, I think it
shaved 30 bytes or so, but I am still
Over 512 bytes.  

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


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