error while update from dhcp

Simon Hobson shobson0309 at colony.com
Wed Sep 22 08:05:38 UTC 2004


Kevin Darcy wrote:

>  >Sep 21 13:48:15 voyager2 named[9212]: error processing update packet
>>(YXRRSET) id 60797 from [127.0.0.1].33370
>>Sep 21 13:48:15 voyager2 dhcpd: if IN A DIAL_NEUMAIR.sb-brixen.it rrset
>>doesn't exist add 175000 IN A DIAL_NEUMAIR.sb-brixen.it 10.1.2.11: RRset
>  >already exists.


>It's not really an error; it's informational. Basically, what all of
>that cryptic stuff means is "I tried to add the name
>DIAL_NEUMAIR.sb-brixen.it to DNS, but it already existed".


Further to that, in the second entry we can see what the DHCP server 
was attempting. The normal form of an update (from the ISC server at 
least) is :

if <some record> doesn't exist add <some record>

Ie, there is a conditional update to avoid overwriting existing 
records. Because the record already exists, the condition fails, and 
so the update is not performed and the first line above is logged.


Normally, the dhcp server will manage it's 'own' dns records. A 
common issue is where someone switches from static addressing to 
dynamic with dns updates - you already have entries for the hosts and 
so the test above fails until the admin manually removes the original 
dns entries.

Simon

-- 

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Simon Hobson MA MIEE, Technology Specialist
Colony Gift Corporation Limited
Lindal in Furness, Ulverston, Cumbria, LA12 0LD
Tel 01229 461100, Fax 01229 461101

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Regd. Office : 100 New Bridge Street, London, EC4V 6JA.


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