ICMP

• Found in RFC 1885 and originally found in RFC 792.

  • The functions of ICMP are explained in 1885, but many other RFCs are referenced:
    • 1970 for Neighbor Discovery
    • 1191 for Path MTU Discovery

• IPv4 extension.

• Continues to provide some maintenance for an unreliable IPv6.

• No ICMPv6 messages are sent for ICMPv6 errors.

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