Protocol
ICMP
ICMPv6
Lab ready Full lab
ICMP/ICMPv6 carries control and error messages for IP: echo, unreachable, time exceeded, and (for v6) Neighbor Discovery. Operators filter it aggressively, yet PMTUD and many diagnostics still depend on it. Treat soft errors as signals, not noise.
Tags
diagnosticsechopmtudnd
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