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How ICMP is used in ping and traceroute facilities
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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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