packetdiag — TCP header

packetdiag {
  colwidth = 32
  0-15:   Source port
  16-31:  Destination port
  32-63:  Sequence number
  64-95:  Acknowledgement number
  96-99:  Data offset
  100-105: Reserved
  106-111: Flags
  112-127: Window size
  128-143: Checksum
  144-159: Urgent pointer
}