Compression / Pointers on returned queries
Mark_Andrews at isc.org
Thu Jun 5 03:25:40 UTC 2008
> Brian Feeny wrote:
> >> -----Original Message-----
> >> From: Mark_Andrews at isc.org [mailto:Mark_Andrews at isc.org]
> >> Sent: Wednesday, June 04, 2008 9:57 PM
> >> To: Brian Feeny
> >> Cc: bind-users at isc.org
> >> 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.
> How old are these devices? RFC 2671 was published in August of 1999.
RFC 1034 was published in 1987. These boxes aren't even
RFC 1034 compliant.
> Note that you can configure named use 512 as its EDNS0 buffer size, to
> get around middlebox obsolescence/brokenness. See "edns-udp-size" in the
> ARM documentation.
> - Kevin
Which only works if the server talks EDNS which it doesn't.
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark_Andrews at isc.org
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