Computer showing wrong IP Address in Manage>Computers

I have a computer that the Management Console tried pushing the Agent to unsuccessfully.  The computer was, at the time, using a VPN from his home network.  SMC is now showing his home IP of 192.168.x.x and when I try to ping the computer I get a second IP, which is in the VPN range.  How do I clear the IP Addresses and have SMC pull a new one for the computer?