I am in the process of changing ISP for our site. Our server is an SBS 2003 box and provides DHCP for the network. Our current ADSL connection (through our existing ISP) is via a Netgear Modem/Router and the web interface has a control button to turn the DHCP server on or off. Nice and easy.
The new ISP has provided a Cisco SRP527W modem/router and I can't successfully turn off its DHCP server.
I've had the new ADSL connection put onto a different phone line so I currently have both services working. The SBS and the network is still using the old service through the Netgear device. If I connect a PC to the new Cisco router I can connect to the Internet no problems on the new ADSL connection. But I need to turn off DHCP in the Cisco device before I use it for the main network and the SBS.
The CISCO device has a DHCP Server set up in it and then a VLAN using the DHCP server. I can't delete the DHCP server because it says a VLAN is currently using it.
If I try to delete the VLAN, I lose access to the router. I can no longer see the router through the gui, I can't even ping the router.
I've tried changing the VLAN setting from 'DHCP server' to 'Static' and to 'Dynamic'. Either way I still have the same result - I lose access to the router. I even set the Cisco router's IP address to an unused IP in the SBS's subnet, and connected it to the main network, with the VLAN set to 'Dynamic'. The theory was that the router would be dymanically given IP addresses from the SBS for each of its ports. I connected a PC to the router as well as the router to the main network. The PC got IP issued from the DHCP of the SBS through the router's switch, but I still can't talk to the router.
So, at this point I don't think I can use the Cisco router because I can't disable the DHCP successfully.
I cannot believe that it can be this hard to configure!
Does anyone out there no how to disable the DHCP server on this router?