Configure multiple IPs/interfaces on RND4000

Although I have marked mdgm's answer as the right solution there is another one that is possible and which works out considerably cheaper without breaking the networks, that is to connect those home computers that need access to the drive to both networks.

This can be done relatively easily although depending on the machine it might be 'fussy'.

If you have a desktop then you can add a second interface card, either wired or wireless, and connect that to the second home network. You will have to update your computer's network config so that one of the broadband connections is the default gateway but otherwise there should be no problems with the connectivity. Desktops can have multiple wired connections, multiple wireless ones or one of each type, about the only thing that won't work easily is havng a single wireless card since you cannot connect to both wireless connections at the same time (see below). Obviously you are going to need to be able to reach both hubs via cable or wifi signal and using wifi can make for slower file access.

With laptops and wireless devices it is unlikely that you will be able to add in a second interface, although not impossible depending on your hardware (I know for a fact that some laptops have built-in wifi cards and also PCMCIA slots that will take a second wifi interface). In this instance you will have to get used to switching between the two networks, or just using the one network that has the shared drive on it.