Understanding your objective - both as a concept and as implemented within the system is critical. Knowing a command exists or how it can be applied is next in importance. Remembering the exact parameters or syntax is normally then trivial. Command documentation is normally close at hand. Also, (re)verifying your assumptions (or recollections) is always a wise decision.
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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