I have a PIX 501 (V.6.3) behind a cable modem that assigns the PIX an IP on the outside interface. For some reason I am able to PING the outside interface although the security is set to 0 and i have no statements allowing ICMP in or out. I can not PING from inside the network to the outside (i know how to change that) but I am able to ping the outside interface from outside the PIX. I am thinking it has something to do with the cable modem but I am not sure. Help!