Caching-only Name server does Zone Updates

[Ashish]

Hi Barry,

Thank you for your reply.

There was a reverse lookup done as per the Debug content.
We have 4 Name servers so there should be 4 response containing NS records
in the Authority Section and the corresponding A records in the Additional
Section.

But we have thousands of statement like 
> Db_update
> Match
in the Debug file.

Kindly advice.

Kind Regards,
Ashish
-----Original Message-----
Date: Tue, 03 Feb 2009 03:42:32 -0500
From: Barry Margolin <barmar at alum.mit.edu>
Subject: Re: Caching-only Name server does Zone Updates
To: comp-protocols-dns-bind at isc.org
Message-ID: <barmar-900C8B.03423203022009 at mara100-84.onlink.net>

In article <gm8o6b$1vav$1 at sf1.isc.org>, "Ashish" <ashish.rao at wipro.com> 
wrote:

> Thank you Mark,
> 
> Doupdate is followed by lot of statements like 
> 
> Db_update
> Match
> 
> Please see the content below.
> =========================================================================
> Doupdate(zone 0, savens x, flags y)
> Doupdate: dname 21.in-addr.arpa type 6 class 1 ttl 600
> Db_update(21.in-addr.arpa, 0x12345, 0x56789, 087, 0x76543) match(0x9b430,
1,
> 6) 1, 6
> db_update: flags = 0x19, sizes = 71, 71 (1)
> match(0x9123v, 1, 6) 1, 6
> db_update: flags = 0x19, sizes = 71, 71 (1)
> match(0x9sd33, 1, 6) 1, 6
> db_update: flags = 0x19, sizes = 71, 71 (1)
> match(0xdg6d8, 1, 6) 1, 6
> db_update: flags = 0x19, sizes = 71, 71 (1)
> match(0x6abde, 1, 6) 1, 6
> ==========================================================================
> 
> Please correct me if I am wrong, I thought that for cache update it should
> update only one record. So why so many updates are been made.

The response probably contained NS records in the Authority Section and 
the corresponding A records in the Additional Section.  These update the 
cache as well.

-- 
Barry Margolin, barmar at alum.mit.edu
Arlington, MA
*** PLEASE don't copy me on replies, I'll read them in the group ***



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