Are you relocating a server? Or creating a new copy of the server?
1. If it's a relocation job, and the server is physically moving / being readdressed, then there's no problem - if client sstill connect using their existing connection strings, you'll be able to see the traffic on the server. If they don't, then you'll need to make sure that nothing else has gone wrong.
2. Linked servers - again, if it's a server move (physical relocation), then there should be nothing to worry about - assuming that the firewall paths are all good.
If you're doing a side-by-side, ie going from one server to another, the easiest thing to do is turn off the original server (or at least disable the SQL Server services) and see what still works / what's broken.
Much better (in my mind) to do a side-by-side upgrade, ie transfer just the data across from one to another - that way, you've got a much faster fallback should things go wrong.
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