0x11, 0x22, 0x33, 0x44, 0x55, 0x66, # destination_mac
  0x66, 0x55, 0x44, 0x33, 0x22, 0x11, # source_mac
  0x08, 0x00, # ether_type
  0b0100_0101, # ip_version, ip_header_length
  0x00, # ip_type_of_service