Restrict Wireless Client access to only 1 router

Is there a way to limit access from a wireless client to connect to
only 1 router and no others? More simply, we would like to limit our
clients to be able to access the router at our office to download
information collected throughout the day with out them being able to
connect to unsecured wireless networks they may encounter throughout
the city, during the day. With the popularity of wireless networks and
particularly unsecured ones, this is becoming a problem. All of the
equipment is Dlink.

Thanks in advance

> Is there a way to limit access from a wireless client to connect to
> only 1 router and no others? More simply, we would like to limit our
> clients to be able to access the router at our office to download

You could try the hotspot defense kit

http://tinfoilhat.shmoo.com/

Not sure how it would work out for you but you can specify the MAC
addresses of the AP's that are in the allowed list as far as I know.
Not sure how well you'll be able to lock it down to prevent users
modifying the list.

David.