Collin Clark Wed, 10/14/2009 - 12:03
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Suppose Device A wants to see if it can reach Device B. Device A begins the test process by sending an ICMPv4 Echo message to B. Device B, when it receives the Echo, responds back to Device A with an Echo Reply message. When Device A receives this message, it knows that it is able to communicate (both send and receive) successfully with Device B.


Can you rephrase your 2nd question?

anthic.lobo Fri, 10/16/2009 - 08:27
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So does this mean that i need to allow both echo reply and echo for me to ping the device

Collin Clark Fri, 10/16/2009 - 10:48
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Echo-reply for sure and if you'll be pinging from the device, you'll need echo as well.

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