Re: Microsoft DHCP server not updating non-Microsoft DNS

There are no firewalls between the DHCP Server and DNS Servers. The DHCP
server can update it's own DNS Records without any problem.

The SOA is listed as the InfoBlox which is hosting the Zone. If you do a
NSLOOKUP for the domain's SOA it returns the InfoBlox.

If we stop the DNS Service on the MS Server running DHCP, we do see the SOA
Query and it does return the InfoBlox server record. But it does not send
any update requests for the client. If we have the DNS Service running on
the DHCP server and the secondary Zone is available, we do not see the SOA
request on the packet capture because the DNS request is handled locally. We
still do not see an update request for the client though.

The InfoBlox Zone is setup to allow DDNS Updates from the DHCP server only.
The clients cannot do their own DDNS updates. Although this doesn't matter
since the requests are not being sent to the InfoBlox at all.

Do you have any idea why there are no updates being sent out.

Jeff


"Ace Fekay [MVP]" wrote:

In news:6567848E-D9C7-4994-B372-DF884A4973D5@xxxxxxxxxxxxx,
JLarmore <JLarmore@xxxxxxxxxxxxxxxxxxxxxxxxx> typed:
We have a Windows 2003 server at a remote location running DHCP and
DNS. It only has secondary zones on it. At our main location we are
running InfoBlox DNS appliances with the primary DNS zones. We have
configured DHCP to Always Update DNS A and PTR records and to discard
records when the lease expires. In the Server Options we have the MS
DNS server and the Infoblox server listed, as well as, the DNS Domain
name.

When a client gets a DHCP lease the DHCP server is not sending out
and DNS Update records. (Monitored network traffic with a sniffer).
If you ipconfig /registerdns from the server it will update it's own
records. We have also tried disabling the MS DNS service and
removing it's IP Address from the DNS options. But the DHCP server
still does not send any DNS Updates to anything. (Once again
monitoring traffic with a sniffer.)

It was my understanding that the DHCP service should send the update
to the DNS server based on the SOA record for the zone. Does the MS
DHCP server not follow this convention?

Thanks,

Jeff

Yes it does query for the SOA of the zone. Read the following to see if you
missed anything in your configuration:

How to configure DNS dynamic updates in Windows Server 2003
http://support.microsoft.com/kb/816592/en-us

Also, I assume there are no firewall rules blocking UDP 53, the primary zone
on InfoBlox is allowing updates and it's listed as the SOA. However since
your sniffs say there is no updates being sent whatsoever is interesting.
Did you check to see if it is querying for the SOA?

I'm not familiar with InfoBlox. Is there any type of security set on the
zone for updates at the SOA?

--
Regards,
Ace

This posting is provided "AS-IS" with no warranties or guarantees and
confers no rights.

Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSE+I, MCT,
MVP Microsoft MVP - Directory Services
Microsoft Certified Trainer

For urgent issues, you may want to contact Microsoft PSS directly. Please
check http://support.microsoft.com for regional support phone numbers.

Infinite Diversities in Infinite Combinations



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