ICMP Dev Typically used in tools like ping, traceroute
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ICMP Dev Tags

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ICMP Dev Description

ICMP is a protocol which can conceptually be placed above IP but which in fact is part of it. That's because IP uses it to transmit maintenance information and error reports like: unreachable host, incorrect parameter. If you want to know more about ICMP read the RFC 792. In this context reading the RFC 791 about the IP protocol is probably a good idea. The ICMP library is typically used in tools like ping, traceroute or bing. For example ping sends ICMP Echo Request packets and expects to receive in return ICMP Echo Reply packets or another type of ICMP packet indicating an error. It would not be possible to write a tool like ping without ICMP packets. ICMP is also used in other applications less tied to it. Squid for instance (a very good Web cache) uses it to determine its network environment caracteristics and then optimise its behavior accordingly.

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