our LAN has been typically just a vpn wired router with a couple of hubs and a cable modem for internet. Now have people needing a wireless router. What is best way to use a wireless router with our existing setup in a way that does not allow outside attacks to penetrae our LAN via the new to be added wireless router? To be more clear, the ultimate question is once the wireless router is in the mix, how can I be sure it has not created a vulnerability to areas that are now protected by the vpn router? I am trying to avoid opening up a way for hacks to get it via the wireless where previously they have not been able. Is this even a valid concern?