How ICMP is used in ping and traceroute facilities

Answer Posted / partha

Internet Control Message Protocol (ICMP) pings and
traceroute on the PIX Firewall are handled differently
based on the version of PIX and ASA code.

Inbound ICMP through the PIX/ASA is denied by default.
Outbound ICMP is permitted, but the incoming reply is
denied by default.

** ASA/PIX does not support ICMP redirects, because it does
not support asymmetric routing

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