ICMP in Action
If you were to look at all of the ICMP traffic crossing your network, you would probably be surprised at the amount that gets generated and exchanged during a normal day. This is not necessarily a bad thing, since ICMP is what keeps IP working so well. Most web sites will experience a significant amount of Path MTU Discovery messages, for example. In addition, sites that move services around on different hosts frequently will see a lot of Destination Unreachable messages, as clients attempt to connect to relocated services.
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