I am in Fiji and we have one DSL provider. They provide a NetComm NB604N WiFi router (w/ modem) with their service. Normally, once connected, the router defaults to providing a gateway address of 192.168.1.1 and DHCP is turned on. At one specific location (i.e., one specific telephone line), when a NetComm router (which performs as above at all other locations) dials a connection, it hands out TWO sets of IP addresses, 192.168.1.x AND 192.168.10.x. Each time you connect to the router (wired or wirelessly) you have a 50% chance of getting an address from either subnet. If you do an ipconfig, you see TWO gateways, 192.168.1.1 AND 192.168.10.1. If you get the xxx.xxx.1.x addres,s you have Internet connectivity, but if you get a xxx.xxx.10.x address you do not.
The same router that hands out two sets of address at the one bad location works perfectly at two other locations. I have tested this with three different routers. All work perfectly everywhere except the one bad location. Every router I have tested at the bas location hands out two subnets, two gateways.
The local ISP appears clurless as to how it could happen. They keep sending out "line techs" to "fix the fault" but nothing gets fixed. Any idea HOW this can happen?