Tech Stuff - 802.3 Type/Length Fields
The Type/Length field is assigned and controlled by the IEEE which we are delighted to say is now publicly available. IANA maintains a public list of values that have been culled from various sources BUT IS NOT DEFINITIVE and in fact shows a number of conflicts.
The list below was derived from personal inspection and research and is INCOMPLETE and in the interests of consistency will not be maintained. Use the DEFINITIVE IEEE source referenced above.
| Value (Hex) |
Status |
Assigned to/Used by |
| 0600 |
? |
Xerox XNS |
| 0800 |
Active |
IP (TCP/IP) IETF |
| 0801 |
? |
X.75 over LAN |
| 0805 |
? |
X.25 Level 3 over LAN |
| 0806 |
Active |
ARP (IP) Address Resolution
Protocol. IETF |
| 08AD |
? |
Banyan |
| 6004 |
? |
DEC LAT |
| 6005 |
? |
DECNet diagnostics |
| 8035 |
Active |
RARP (Reverse ARP) IETF |
| 8046 - 8047 |
? |
AT&T |
| 80D5 |
? |
IBM SNA Service over Ethernet |
| 8100 |
Active |
IEEE VLAN 802.1Q Tag Protocol
Identifier (TPID) followed by a 16 bit TCI value. IEEE. |
| 8137 - 8138 |
? |
Novell IPX/SPX |
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