DNS Problems

[TJM]

Have DNS setup for our network. It is AD Integrated. We also use DHCP for
all of our clients and they are setup to update DNS dynamically. The problem
we are having is if we rebuild a system, we use RIS for this, DHCP assignes
a new IP address to the system the record in DNS is not getting updated. Do
I have something configured wrong? The OS on these systems is Win XP Pro.

Thanks,

Tim M

 

[Herb Martin]

Have DNS setup for our network. It is AD Integrated. We also use DHCP for
all of our clients and they are setup to update DNS dynamically. The problem
we are having is if we rebuild a system, we use RIS for this, DHCP assignes
a new IP address to the system the record in DNS is not getting updated.

Do you mean the new registration (same name, different IP)
is not getting added, or that it is not overwriting the existing
record of the same name but adding a second?

Do
I have something configured wrong? The OS on these systems is Win XP Pro.

DHCP clients can change address for a variety of reasons,
so that is normal whether you re-install or not.

 

[Kevin D. Goodknecht Sr. [MVP]]

In

Have DNS setup for our network. It is AD Integrated. We
also use DHCP for all of our clients and they are setup
to update DNS dynamically. The problem we are having is
if we rebuild a system, we use RIS for this, DHCP
assignes a new IP address to the system the record in DNS
is not getting updated. Do I have something configured
wrong? The OS on these systems is Win XP Pro.

I can't say if you have something wrong from your post.
But if DHCP is responsible for DNS registration, you must use
Win2k/Win2k3 DHCP, option 015 must be configured with the
AD domain name, the NICs on the DHCP server machine must
be using the Windows DDNS server in TCP/IP properties.
The XP Pro machines can register themselves, as long as they
are using the Windows DDNS server in TCP/IP properties,
and they have the Primary DNS suffix of the DDNS zone or
Connection specific DNS suffix of the DDNS zone. The client
will also need permissions in the zone if it is allowing only secure
updates, non members will not be able to make DDNS registrations
in a secure zone, unless the DHCP server has permissions to update
the zone, which overrides secure dynamic updates because any
client getting its addresses from the DHCP will be able to register
by the DHCP server.

 

[Herb Martin]

in a secure zone, unless the DHCP server has permissions to update

the zone, which overrides secure dynamic updates because any
client getting its addresses from the DHCP will be able to register
by the DHCP server.

I agree with you post in general and think the above
needs a little clarification: DHCP doesn't "override
secure dynamic updates" it performs them on behalf
of the client machines -- i.e., the DHCP server must
still be authenticated and the security is applied to
the DHCP server rather than to clients individually.

 

[TJM]

Yes, the system has the same host name and DHCP assigns a different IP
address. The IP in DNS is not updated in DNS. If I compare the DNS record
with the DHCP lease they show different IP addresses. I then check the IP on
the computer and it matches the address in DHCP.

Tim M