my configuration is
internet-->netopia router-->cisco pix firewall-->client computers
i am trying to establish a vpn connection where the client computers are on the inside of the firewall and the server is outside, offsite. i can open the vpn tunnel fine, but when i enable the gre for the IP of the vpn client computer, all our sites we host here, and our mail server (which is also hosted on the inside of the firewall) no longer function. in other words, they are not accessable to anything outside the firewall.