After nothing but hassles with my POS Linksys WAG120N, I bought a  Cisco RV110W instead. Yesterday, I tried setting it up with the Linksys being used only as a modem. I was unable to, though because when I entered 192.168.1.1 into my browser as per the Cisco setup instructions, I was taken to the admin login for the Linksys. This seemed odd to me, because the Linksys was not connected to the PC at all. The connection setup was exactly as specified in the RV110W instructions: modem connected to dsl line,  ethernet cable from modem (Linksys WAG120N) to the slot marked "WAN" on the RV110W, another ethernet cable from RV110W to my PC. Despite this, the admin page was for the linksys not the cisco. 

Today, I exchanged the WAG120N for a Netgear DM111P, just a modem, not a router. Same setup configuration: modem connected to dsl line,  ethernet cable from modem (NetgearDM111P) to the slot marked "WAN" on the RV110W, another ethernet cable from RV110W to my PC. Same result - type in 192.168.1.1 and get taken to the admin page for "Netgear DM111P" 

Clearly, there's a serious PEBKAC situation here, but what exactly is it? Any help resolving this will be very gratefully received.