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!