ICMP Protocol Types & Codes

[Resheph]

Below is a list of ICMP types and codes. The list is not complete and I have only included those I found somewhat useful.

ICMP types and codes

• Type 0 - Echo Reply
• Type 3 - Destination Unreachable
  • Code 0 - Net Unreachable
  • Code 1 - Host Unreachable
  • Code 2 - Protocol Unreachable
  • Code 3 - Port Unreachable
  • Code 4 - Fragmentation Needed and Don't Fragment was Set
  • Code 5 - Source Route Failed
  • Code 6 - Destination Network Unknown
  • Code 7 - Destination Host Unknown
• Type 5 - Redirect
  • Code 0 - Redirect Datagram for the Network (or subnet)
  • Code 1 - Redirect Datagram for the Host
  • Code 2 - Redirect Datagram for the Type of Service and Network
  • Code 3 - Redirect Datagram for the Type of Service and Host
• Type 8 - Echo
• Type 9 - Router Advertisement
  • Code 0 - Normal router advertisement
  • Code 16 - Does not route common traffic
• Type 10 - Router Selection
• Type 11 - Time Exceeded
  • Code 0 - Time to Live exceeded in Transit
  • Code 1 - Fragment Reassembly Time Exceeded
• Type 13 - Timestamp
• Type 14 - Timestamp Reply

Source: https://www.iana.org/assignments/icm...rameters.xhtml