name: IPv4 Header (Bit Layout)
size: 4B
layout: 32b
fields:
  - offset: 0-3b
    name: Version
    type: bits
    description: "IP version (4 for IPv4)"
    color: blue
  - offset: 4-7b
    name: IHL
    type: bits
    description: "Header length in 32-bit words"
    color: cyan
  - offset: 1B
    name: DSCP+ECN
    type: uint8_t
    description: "Byte 1 using B suffix"
    color: yellow
  - offset: 16-31b
    name: TotalLength
    type: uint16_t
    description: "Total packet length (2 bytes = 16 bits)"
    color: green