ICMP

[treiher]

Schemas

Destination Unreachable Message, Time Exceeded Message, Source Quench Message

• Fixed-size field systematization-binary-schemas#1
• Checksum field systematization-binary-schemas#10 (Checksum)

The checksum is the 16-bit ones's complement of the one's
complement sum of the ICMP message starting with the ICMP Type.
For computing the checksum , the checksum field should be zero.
This checksum may be replaced in the future.

• Field type: enumeration systematization-binary-schemas#22 (Type, Code, unused)
• Field type: opaque systematization-binary-schemas#23 (Internet Header + 64 bits of Original Data Datagram)

Parameter Problem Message

• Fixed-size field systematization-binary-schemas#1
• Checksum field systematization-binary-schemas#10 (Checksum)
• Field type: enumeration systematization-binary-schemas#22 (Pointer)
• Field type: enumeration systematization-binary-schemas#22 (Type, Code, unused)
• Field type: opaque systematization-binary-schemas#23 (Internet Header + 64 bits of Original Data Datagram)

Redirect Message

• Fixed-size field systematization-binary-schemas#1
• Checksum field systematization-binary-schemas#10 (Checksum)
• Field type: enumeration systematization-binary-schemas#22 (Gateway Internet Address)
• Field type: enumeration systematization-binary-schemas#22 (Type, Code)
• Field type: opaque systematization-binary-schemas#23 (Internet Header + 64 bits of Original Data Datagram)

Echo or Echo Reply Message

• Fixed-size field systematization-binary-schemas#1
• Field length defined by available space systematization-binary-schemas#3 (Data)
• Checksum field systematization-binary-schemas#10 (Checksum)
• Field type: enumeration systematization-binary-schemas#22 (Identifier, Sequence Number)
• Field type: enumeration systematization-binary-schemas#22 (Type, Code)
• Field type: opaque systematization-binary-schemas#23 (Data)

Timestamp or Timestamp Reply Message

• Fixed-size field systematization-binary-schemas#1
• Checksum field systematization-binary-schemas#10 (Checksum)
• Field type: enumeration systematization-binary-schemas#22 (Identifier, Sequence Number, Originate Timestamp, Receive Timestamp, Transmit Timestamp)
• Field type: enumeration systematization-binary-schemas#22 (Type, Code)

Information Request or Information Reply Message

• Fixed-size field systematization-binary-schemas#1
• Checksum field systematization-binary-schemas#10 (Checksum)
• Field type: enumeration systematization-binary-schemas#22 (Identifier, Sequence Number)
• Field type: enumeration systematization-binary-schemas#22 (Type, Code)

Specification

https://tools.ietf.org/html/rfc792