Multiple IPs on a DC

The situation is fairly complex, but in short:

I need to DCPromo down a server with IP x.x.2.3 and change it's IP address
in preparation for a coming upgrade process.

In the end I will have a new DC with x.x.2.3.

The problem being that I have some devices that are hard coded for LDAP
lookups, DNS lookups etc to x.x.2.3.

Until I get the new server up, can I simply assign a secondary IP to a DC of
x.x.2.3. No DNS record is necessary.

Thanks,
Bob

Jorge
Thu Mar 27 14:30:10 PDT 2008

Hi
When you remove that server, don't forget to check and remove any record
left by that server, after that you add the second ip address to the
existing server, restart the netlogon service and you should get the new ip
for that server registered in the DNS. If possible test it first.

--
I hope that the information above helps you.
Have a Nice day.

Jorge Silva
MCSE, MVP Directory Services

v-chanyin
Fri Mar 28 04:58:58 PDT 2008

Hello,

Thank you for your post and as well as to Jorge for the inputting.

Generally speaking, it is not recommended to configure multiple IP
addresses on a network adapter of a domain controller as it may cause
browsing and other Active Directory communication issues. Some problems are
described in the following Microsoft Knowledge Base articles:

191611 Symptoms of multihomed browsers
http://support.microsoft.com/kb/191611

272294 Active Directory communication fails on multihomed domain controllers
http://support.microsoft.com/default.aspx?scid=kb;EN-US;272294

If you really want to add another IP address to the network adapter, I
suggest that you uncheck the "Register this connection's address in DNS"
option on the network and then register the IP address on the DNS server
manually. To do so, please ensure that your domain controller has been
updated to Window Server 2003 SP1 as it resolves a known issue with DNS
name registration.

Clients cannot log on to domain controllers that are Windows Server
2003-based DNS servers, and network interfaces that are not registered in
DNS can still perform dynamic updates
http://support.microsoft.com/kb/832478/en-us

Meanwhile, if the new server is on another hardware, you may consider the
following procedure:

1. Add a new server to the domain and promote it to domain controller.
2. After you ensure that everything is working, demote the original DC.
3. Change the IP address of the old DC and then the change IP address of
the new DC to x.x.2.3.

In this way, the x.x.2.3 IP address will only be unavailable when you
change the IP address of the two DCs. You may perform the operation in
non-working hour to control its potential influence.

I hope that the above information can be of assistance. If anything is
unclear or you have any concerns, please feel free to let me know.

Sincerely,
George Yin
Microsoft Online Support
Microsoft Global Technical Support Center

Get Secure! - www.microsoft.com/security
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Jorge
Fri Mar 28 07:29:00 PDT 2008

Ok,
I though that Bob was referring to one NIC with 2 different IP address
within the same subnet, is this what you want to do?
Or are you tihinking in multiple NICs?

--
I hope that the information above helps you.
Have a Nice day.

Jorge Silva
MCSE, MVP Directory Services

v-chanyin
Thu Apr 03 03:59:06 PDT 2008

Hello,

I am just writing to see how everything is going. If you have any updates
or need any further assistance on this issue, please feel free to let me
know. I am glad to be of assistance.

Sincerely,
George Yin
Microsoft Online Support
Microsoft Global Technical Support Center

Get Secure! - www.microsoft.com/security
=====================================================
When responding to posts, please "Reply to Group" via your newsreader so
that others may learn and benefit from your issue.
=====================================================
This posting is provided "AS IS" with no warranties, and confers no rights.