Network Migration Help with the same subnet in two location

amb1s1

Hi, we are planning to move our Data center to another location outside our building. We are in the very early stages of planning. Our manager asked us if we can use the same ip's when we start moving servers. The most experience engineer told him that it is possible. After the meeting I asked how it was possible because I always thought you can't have the same subnet in two different locations. He started to explain me, but it was time to go home. He told me that it is possible using distribute-list. I'm the first one to say that I'm not good with distribute-list, but I started small GNS3 lab to see how it works and I don't even know how to start and like always this is my first place to ask if I'm stock.

Ok, here is the link of the lab that I'm using

http://farm4.static.flickr.com/3296/5772792294_c68494ce5a.jpg

Like you see R11 and R8 are in the same subnet 172.20.50.0/24. How can I tackle this issue, if possible? and if there is a better way to do migration. Thanks in advance

Monkerz

What size pipe will you have between the two locations? Being in the same subnet, you could setup a VPN tunnel, but all broadcast traffic would be sent across the pipe. With a significant amount of traffic, the delay would be noticeable.

amb1s1

The pipe is going to be 100mb and yes we are going to use VPN tunnel.

vinbuck

NAT is another possibility. You can NAT the traffic to and from the duplicate subnet to keep everything straight. Just depends on your preference, design requirements and equipment capabilities.