I have a situation where we will be moving part of our building, however, we do not want to change any IP addresses. This would not be a problem, except we have a PPP link to a third building that we need to keep. As part of the migration, this third building will have a new connection to both buildings. As a result, we will have the same subnet in two locations, and I'm trying to figure out the best way to handle this.
I've thought about Mobile IP (not likely), source-destination NAT-ing (also not likely), trying to get a layer 2 connection between the new and old building (is that even possible with carriers?), possibly a wireless bridge if line-of-site is possible, or ???
Has anyone done something similar, and if so, what options did you consider? I haven't had a chance to sit down and really think this through, but I feel like I'm missing something simple!
It seems to me that the NAT for Overlapping Addresses would be the optimum solution for you, especially as far as access to/from the third building is concerned.
You have described the new and the old building as connected to the third building. Are they connected to anything else? Especially if there is Internet connectivity then there may be more challenges to address.
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