Internet Control Message Protocol

A "helper" protocol that supports IP, provides information, and error reporting.

Many messages have been deprecated, reserved, or are obsolete.

Each message has a Type, and each type may have several Codes.

Type 0 Echo Reply:

  • Ping

Type 3 Destination Unreachable:

  • Code 0 Destination Network Unreachable
  • Code 1 Destination Host Unreachable
  • Code 3 Destination Port Unreachable (NOTE: See Layer 4 for slight modification regarding TCP)

Type 8 - Echo Request:

  • Ping

Type 11 Time Exceeded:

  • Code 0 TTL Exceeded
  • Code 1 Fragment Reassembly Time Exceeded

Type 30 Traceroute:

  • Deprecated

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