I am a member of a non-profit group. We have a network with basic accounting data, membership lists, etc. None of the IP addresses are static (I think, at least), and there is currently no firewall. The building is roughly 150x150 on two floors; we don't think that the floor between the first and second story is concrete---we are not certain at this point. All inside walls are wood and plaster.
We are considering installing a wireless hub to allow members to use the Internet while in the building. We have been presented with a couple of options, of course one is expensive while the other is the opposite.
Expensive: Put in a firewall, and multiple access points
Not Expensive: Put in three routers. One to the outside, the other two would get their "outside" IP from the main router, but each would use a different IP scheme for the users. I believe that the tech suggested a new series G wireless hub might cover the entire building, although he wasn't certain.
I am certain that a firewall will provide a more secure solution, but I doubt that it is worth the cost. I just want to be reasonably sure that a wireless user won't spread a worm or virus throughout out network, and reasonable sure that some 16 year old kid with a laptop won't take our network down. Of course, nothing is certain.
Thanks in advance, Rick