Join Date: Apr 2002
Sportbike: 2002 Turbo Hayabusa
Years Riding: Lost Track
How you found us: Tony
Misconfigured wireless is a huge security hole. Essentially you need to not exchange security keys in the open and make encryption manditory. If possible, do not broadcast the ESSID.
Badly configured wireless routers can even be reconfigured by someone accessing externally. Make sure you router is password protected and that the password is not simple to guess.
They don't appear to have a firewall because you are on the LAN side of their firewall. If they don't have firewall software on their attached PC and have open services (i.e. file shares, etc.) you may have direct access to their system(s).
If you don't know what your doing, you should probably avoid a wireless LAN for home use or make it a subnet attached to another router so you are firewalled from the wireless LAN and the WAN.