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tblinc

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how to murge two business network that have the same Subnet.

Our business recently murge with another one. We also need to murge both network with a VPN for the moment. My issue is that both network have the same subnet (10.0.0.0 /24).

On the branch office I have a Windows 2008 domain controller. I have multiple GPO, dns server, Active directory, ect...

I don't think that I can change the IP address of this DC like this. I want to know what should I do to prevent all possible trouble.

thank you.
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bluepig

Your description needs more detail; however, let's try to answer. I am guessing that you have two physical locations, and that you need a VPN between them. I am also guessing that some of the IP addresses in location A are identical to some IP addresses in location B (eg both locations have a device with the address 10.0.0.1).
If this is the case, you cannot make a VPN between the two locations. You will have to renumber one of the locations first. (You are going to have to renumber one of the locations sooner or later; you might as well do it now)
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rfc1180
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Excuse me, currently both network have the same subnet address. I'll change site B subnet to 10.0.1.0 /24.

Like this, I'll be able to successfully build my VPN tunnel.

My question is the following. At site B, I have a windows 2008 Domain controller. I need to have some advise to change it's IP address in the new subnet.

I'm not sure that we can change the Domain controller IP address as a simple workstation since it have every dns entry and multiple gpo on it, wsus and thing like this.

Could you tell me which step I should use to change my DC IP address ?

Thank you and I hope that this is easier to understand.

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rfc1180

This is actually not in place so I have time. Right now, this is what I want to do.. the Plan Of Action.
unfortunately, I can not give you any advice on merging/changing the IP address of a domain controller as that is not my forte. I can, however, give you advice on VPN, NAT, and overlapping networks and have already explained that you can have overlapping networks with utilizing NAT on both endpoints of the VPN tunnel. This can get a bit ugly and tedious to manage but very very possibly as a migration strategy.

Billy
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Multi-homing Update:  And when you've tested everything you can retire the old subnet.  Multi-homing gives you a more gradual migration option to simply moving a server to a new subnet.  For your purposes if you wanted to try it, it would likely only be as a migration tool.
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thanks