Changing IP address of AD server

[Cameron Biggart]

Hi a quick question with (hopefully) a quick answer.

We have a AD setup with 2 DC's and around 100 workstations. Currently the
internal address range has been set up to be 128.1.1.x mask 255.255.255.0
which is a live address range allocated to BBN Communications.

I want to change the internal addresses used to 192.168.120.0/24. I have
added the ip address 192.168.120.115 as well as the existing 128.1.1.115 to
the TCP/IP properties of the server NIC and can ping it from my laptop at
192.168.120.11 but the laptop can't find a domain controller to log into
the domain.

How can I tell the Active Directory that it belongs to the 192.168.120
range as well as the 128.1.1 range when workstations try to authenticate?

 

[Dmitry Korolyov [MVP]]

1) Ensure you have an IP connectivity for the new subnet, i.e. that routing
is set up propertly etc.
2) You will need to add that subnet to Subnets under AD Sites and Services,
and assign to appropriate site
3) You need to make sure that from the new subnet, you can access at least
one DNS server which can be used by clients for finding and resolving AD
resource records. If you have DNS server installed on a DC its a pretty
straightforward thing, otherwise you'll need to modify your configuration
accordingly. And in case if you are using DHCP - don't forget to change DNS
server and default gateway options there as well

At some point you should have a configuration where a computer with an IP
address from the new subnet can use any resources in your domain,
successfully authenticate, resolve names etc. Then you may start removing
old addressing scheme and associated resources.

--
Dmitry Korolyov [[email protected]]
MVP: Windows Server - Active Directory

Hi a quick question with (hopefully) a quick answer.

We have a AD setup with 2 DC's and around 100 workstations. Currently the
internal address range has been set up to be 128.1.1.x mask 255.255.255.0
which is a live address range allocated to BBN Communications.

I want to change the internal addresses used to 192.168.120.0/24. I have
added the ip address 192.168.120.115 as well as the existing 128.1.1.115
to
the TCP/IP properties of the server NIC and can ping it from my laptop at
192.168.120.11 but the laptop can't find a domain controller to log into
the domain.

How can I tell the Active Directory that it belongs to the 192.168.120
range as well as the 128.1.1 range when workstations try to authenticate?