I've got a Linksys here at home, as well ... WRT54G, and the wireless in it is limited with a 128 bit encryption. Of course, it's not the best in the world and a good hacker would be able to get in in about an hour, but then I don't have that much "wireless" activity, that I really need to worry, even I were running the pentagon here :)
They "could" get in. In about an hour, only if you left your Linksys WRT54G wtih the factory defaults and you were running open ports on your computers. I do agree that 128 bit could be turned up a lot more; But for the most part it's not easily deciphered "just like that!". It takes work, A lot of work with a very, very fast pc and patience! ;( I too, take security measures with my Linksys WRT54G and network in general pretty seriously. A wardriver can do a lot of damage if you leave your wireless router wide open. Not only to your computer (s), but to some company and using your network for the damage.
Limiting access by IP ... not too secure
Agreed, A very bad idea!
The way I see it, a real hacker is likely to be more tempted to break into a safe, than he is in entering the closet. So, a "safe" is only partial security as it will "draw" the attention of those interested in the breaking. Thus, the way I see it ... physical security is much more important than other types. Breaking up the network, and having proper firewalls and bridges that will limit physical access according to needed security levels.
You can never have enough layers of security. Networking is like an Art and Science. Education is key here. Read,Read,Read! JD