Ping is not a stateful protocol. To allow pings from the inside to the outside interface you need to create an access-list. If you want to ping the same interface that you are physicly connected you need to configure the "icmp" command.
example:
See: Handling ICMP Pings with the PIX Firewall
http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_tech_note09186a0080094e8a.shtml
The PIX and the traceroute Command
http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_tech_note09186a00800e9312.shtml
examples:
Traveroute
Microsoft:
access-group 101 in interface outside
access-list 101 permit icmp any host YourPublicIP unreachable
access-list 101 permit icmp any host YourPublicIP time-exceeded
access-list 101 permit icmp any host YourPublicIP echo-reply
UNIX:
access-group 101 in interface outside
access-list 101 permit icmp any host YourPublicIP unreachable
access-list 101 permit icmp any host YourPublicIP time-exceeded
ICMP command example
icmp deny any outside
icmp permit any echo-reply outside
icmp permit any echo-reply inside
icmp permit host 192.168.1.30 echo inside
icmp permit host 192.168.1.31 echo inside
icmp permit host 192.168.1.20 echo inside
icmp permit host 192.168.1.40 echo inside
icmp permit host 192.168.1.100 echo inside
sincerely
Patrick
