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10 site Ip Configuration Change

mleman asked
Medium Priority
Last Modified: 2012-05-06

Im looking to redesign my ip address scheme across 9 sites, with 1 main site called a

current dns setup, is all sites point to site a for dns forwarding and site A forward requests for extneral dns to the isp

dns is fine across the whole network.

site A hosts all the fsmo role across 2 domain controllers.

the remaining sites 6 have single dc setups, and 2 have 2 dcs at each site. all in standard configuration.

every site is in a different subnet, 172.21 / 172.22, etc

i need to do 1 site at a time starting with site A,

is it as simple as, add routing to route everything to site A's new range,
change master DC ip address, and run dcdiag /fix to update all the dns service records.(repeat on second dc in same site)
clients on site a would have a new range pushed via a dhcp scope
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Top Expert 2013
In addition, add the new subnets in sites and services and associate those with the proper sites.
Is your internal DNS Active Directory Integrated?  If so then once the DC registers again that info will replicate.
You can also just restart the netlogon service to register the SRV records again.
How long is your DHCP lease set for?
A few other things is to make sure to change anything that may have the old IP hard coded (Anything with static IPs, any applications that may point to that box by IP)

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thank you,

its a clients site so things like statics etc i had already thought about, i just needed some confirmation

dns is intergrated yes

i would change dhcp leases to as short as possible,

the new subnets in s'n's i presume you would add them as you went a long, the work is scheduled to last about 10 months, so it will be phased quite slowly.
Top Expert 2013

Adding them as you went a long is fine.  By the time you get to the last few sites you will have any issues worked out.
The hub site is the important one; once you get by that I think the others will be easy.
Are you also changing the IPs on your printers?  If anyone is using IP printing then that is another thing to check out.


so all in all its a pretty smooth task to do,

change the ip address on each dc in turn at site a, adding the subnet to s'n's and configuring routing and any static ip addresses, connections on that site and connecting sites, dns forwarding etc.

and repeat to each site inturn
Top Expert 2013

Yes, I know you want to start with the hub first.  Is that being mandated by management.  I'd start with a hub site first just to make sure everything goes ok.


just to throw something else in the mix, its a mixed 2000 / 2003 network, majority are enterprise level dcs
Top Expert 2013

2000/2003 won't cause any issues for you



cheers thanks a lot, great help.
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