If you’re just talking about changing the IP address to suit the IP addresses for the PCs at your head office. Then you could just refer to this guide.

“Change FOG Server IP Address”

[url]http://www.fogproject.org/wiki/index.php?title=Change_FOG_Server_IP_Address[/url]

Reinstalled Ubuntu/Fog, restored the database, and PXEboot on the clients is working again. There was a probably a simpler way to get it going without being so drastic, but I was running out of time…