Hi swymer,
Thank you for using the Xerox forum.
I would suggest that you review the following solutions from the WorkCentre 7545 support page to see if they can help.
Solutions for : How To Set a Static IP Address at the Control Panel
Solutions for : Cannot Modify the IP Address From the Control Panel
If they do not resolve your issue you may consider contacting our specific product support experts at the following link:
Gm, I am having a problem changing the IP addres on a Xerox Workcentre 7545. When i log in as an administrator, change the IP address along with the subnet mask and gateway and then reboot after saving changes, the machine reverts back to the old ip address previously on the machine. Any help would be appreciated. thanks.