# ICMPv4 protocol
---
protocol: &icmpv4
  name: icmpv4
  longname: Internet Control Message Protocol
  osilayer: 3
  fields:
    - field: type
      length: 1
    - field: code
      length: 1
    - field: checksum
      length: 2
    - field: roh
      desc: rest of header
      length: 4
    - field: data
      data: true
      optional: true