This is probably an obvious question, but I'm drawing a blank and not having much luck searching docs and NOW.

Is there a good way to verify which connections (particularly NFS connections) are coming over a specific interface? We're switching to a new IP range and I've had a server running two nics on both ranges for a few weeks now, with DNS only pointing to the new IP.

I'm trying to find a good way to verify if any clients are still NFS mounting over the old interface. If possible I'd like to avoid causing a stream of stale file handles when I shut that interface down.