Originally Posted by
scaryjim
Hang on, am I getting this right? You've got an ADSL modem router, and you want to use it as a switch and access point - you're not connecting it to an ADSL line at all?
It's certainly possible, your main issue is likely to be accessing the router's web-based admin interface. The router will expect to use its own DHCP server and you may have difficulty connecting to the router if your PCs are getting their IP addresses from a different DHCP server.
As far as what you want to do: disable the router's DHCP server, and give it a static IP address on the same network as the office (presumably that's 10.0.25.* from what you've already said) - you may have to do this in isolation from the office network (i.e. only have one client machine plugged into the router - nothing else). Turn on the wireless AP, enable WPA encryption and (if I was you) also enable MAC filtering, which allows you to specify the hardware address of devices that can connect to the network. With the router's DHCP server turned off wireless devices should then get their IP addresses off the office network.
All the options to do the above should be fairly obvious in the web-based admin interface. I've managed a couple of netgear routers in the past and never had any problems with them...
An unusual choice of hardware for the purpose, but you should be able to make it work.