Occasionally devices fail to respond to a ping. This can result from devices being off-line, having a local firewall enabled or the perimeter firewall configuration. The Cisco ASA ICMP packet-tracer options differ from the TCP or UDP command options. An example is below: packet-tracer input outside icmp A.B.C.D 8 0 E.F.G.H The ICMP type is "8" (echo request) with code"0" (none). There are no options on destination IPv4 address E.F.G.H. Complete ICMP documentation at URL http://www.iana.org/assignments/icmp-parameters/ Complete Cisco ASA packet-tracer documentation at URL http://www.cisco.com/en/US/docs/security/asa/asa80/command/reference/p.html#wp1878788
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