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List:       dhcp-server
Subject:    RE: DHCP Cleints not updating A records to DNS Server
From:       Simon Hobson <shobson0309 () colony ! com>
Date:       2003-09-30 12:19:29
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Manjunath H N wrote:

>  > Now, for a client to update it's DNS record, it first needs to know
>>  that it should do so. Certain MS clients default to this, others
>>  don't. Secondly, the DNS server must accept the update - if you have
>>  not given it permission to accept an update, then (with the ISC
>>  server at least) the default will be to refuse it (and something
>>  should be logged in the server logs).
>
>The DHCP was running on M$, then the clients were updating, now it has =
>been migrated to Linux, but now the clients are not updating, (DNS still =
>runnig on M$)
>
>Have I missed out any option in my conf file.

First off you need to figure out whether it is :

a) The client is no longer attempting to update DNS

b) The client is still attempting an update, but it fails

Probably the easiest way to do this is to use a packet sniffer and 
see what exchanges are going on on the network. You should see the 
discover-offer-request-ack between client and dhcp server, and a 
separate exchange between the client and the DNS server. If the 
client makes no attempt to contact any DNS server then you would 
appear to have case a) - in which case an examination of the packets 
should allow you to see what is different between the MS and ISC DHCP 
servers (you would have to temporarily turn the MS server back on).

If the client is attempting to connect to a DNS server to update it, 
you should be able to see which one (is it the right one ?), and what 
the response is. The server logs should also offer some clues.

For a packet sniffer, your could use etherreal (free), or there are 
commercial packages. I happen to use EtherPeek (www.wildpackets.com, 
I think they have a free demo) - mostly because it's available for 
Mac.

Simon

-- 

NOTE: This is a throw-away email address which will reach me for as 
long as it stays spam-free, remove date for real address.

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

Registered in England No. 1499611
Regd. Office : 100 New Bridge Street, London, EC4V 6JA.

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