Connected: An Internet Encyclopedia
RFC 1812 - 4.3.2.1 Unknown Message Types
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4.3.2.1 Unknown Message Types

If an ICMP message of unknown type is received, it MUST be passed to the ICMP user interface (if the router has one) or silently discarded (if the router does not have one).


Next: 4.3.2.2 ICMP Message TTL

Connected: An Internet Encyclopedia
RFC 1812 - 4.3.2.1 Unknown Message Types