Yes well, but when I look at that picture I'm not seeing some Cisco device with individually configured ethernet ports, i'm seeing a simple home network using a switching configuration and of course two different subnets. What I'm trying to say is of all the ADSL routers I've seen (ADSL being is the most common here), they simply include a built in switch, no multiple networks If he has two different subnets on the network, it's because he has two DHCP servers. The first one, being where his modem is connected, and the second one being either some kind of D-Link or Linksys wireless router.