In a doctor's surgery there was a LAN comprising of an ADSL modem + D-Link Router + several PCs.
I replaced the ADSL modem + D-Link Router with a new 877w Cisco Router (which has an in-built ADSL modem). The cisco router is DHCP enabled - ie, is a DHCP server.
The original D-Link Router's IP address was 192.168.1.1 and as it was a DHCP server all the PCs were automatically give a 192.168.1.x address.
The factory default address of the Cisco Router was 10.10.10.1 Using this address I accessed the router's HTML configuration pages and changed the Cisco Router's IP address to: 192.168.1.1
Then I restarted all the PCs and verified that they had IP addresses in the range 192.168.1.2 - 192.168.1.254
However, every time I re-visit the surgery, all the PCs have reverted to 10.10.10.x addresses and the router has gone back to being 10.10.10.1
Can anyone tell me why this is happening and how to permanently change the Cisco Routers IP address to 192.168.1.1?
Many thanks, James