I have a problem but not sure where it originates...
I've set up a very small business network and they've got an old Belkin cable router (F5D7231-4) that connects to the building LAN. The building LAN is provided by the landlord and other businesses within the building use the network also. We've basically created a small LAN inside a bigger LAN. We have no access to the building LAN configuration. It's either use it or don't use it.
The router is configured to obtain its public IP by DHCP.
The LAN side of the router has the DHCP server disabled (as we have a Windows server with DHCP server configured - 192.168.100.x range).
The router is also used to provide wifi to the office so company laptops can access the server resources.
Everything works fine sometimes but we're experiencing a problem where the Windows Server DHCP service keeps stopping because another DHCP server is on the network. The network being picked up by devices is the building network (10.10.50.x range) because we see the Windows network profile show "propertylink.local" rather than our "ISA.local".
My question is: Is it possible that a SoHo cable router (the Belkin that they've provided) could be letting through DHCP requests via the WAN port - and thus allowing client computers to obtain incorrect IP addresses?