Wednesday, August 04, 2010

ICMP Parameters

A quick revision on the ICMP type (for reference).

Commonly used ICMP types and codes:

  • 0, 0 - echo reply
  • 8, 0 - echo request
  • 3, 0 - dest. unreachable: network
  • 3, 1 - dest. unreachable: host
  • 3, 2 - dest. unreachable: protocol
  • 3, 3 - dest. unreachable: port
  • 3, 4 - dest. unreachable: frag needed and DF was set
  • 13, 0 - timestamp request
  • 14, 0 - timestamp reply
  • 15, 0 - info request
  • 16, 0 - info reply
  • 17, 0 - mask request
  • 18, 0 - mask reply
For the full list, please refer to IANA site.