How to change IP addresses on a DC running DNS, DHCP and Wins

[Luc Gagnier]

I need to change IP addresse on two DCs running DNS and DHCP. When I change
it, everything seems to be ok except for the DHCP and Wins services that I
can't connect to. I receive an error:" Cannot find the DHCP Server. The
DHCP server you specified cannot be located. The DHCP server might be down,
there might be network problem or the DHCP service might not be installed."
I receive the same message with the Wins Server.

What can I do??

 

[Marina Roos [SBS-MVP]]

If you change the IP of a nic, you will also have to reconfigure DHCP, DNS
and WINS.

 

[Luc Gagnier]

So we can't juste change the IP of the server. Is it possible to make a
backup of these service? We already have over than 1200 reservations...

 

[Kevin D. Goodknecht [MVP]]

In

So we can't juste change the IP of the server. Is it possible to
make a backup of these service? We already have over than 1200
reservations...

The best way to change the IP address on a DC is to first add the new IP to
the server. Then run netdiag /fix which will cause the registration of the
new IP. Then check the bindings on the DNS server, DHCP server, and WINS
server to make sure the new IP is bound.
Configure DHCP option 006 (DNS) and option 044 (WINS) with the new address,
make sure the static clients have the new address for WINS and DNS.

After you verify that the new address is registered in DNS with netdiag
/test:dns /v and replication is working without errors with DCDIAG you can
remove the old address from the DC and delete the old address from the WINS
database.

Repeat the process on all DCs that you are changing addresses on.
Anytime you want to change IP on _any_ mechine netdiag (On the server CD or
download from http://download.microsoft.com) is your best friend. I keep my
copy of netdiag on a network drive so I can access it from any machine I'm
at.

 

[Chris Edson [MSFT]]

Chances are, you'll just need to remove the DHCP Server from the MMC
console, then re-add it with the correct IP, then re-authorize it with AD.
Then cleanup the older authorization entry.
-Chris

--
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Chris Edson
(e-mail address removed)

This posting is provided "AS IS" with
no warranties, and confers no rights.
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