From Wikipedia, the free encyclopedia
EtherType is a field in the
Ethernet networking standard (Ethernet II framing, specifically). It is used to indicate which
protocol is being transported in an Ethernet
frame.
It is claimed that some older (Xerox?) Ethernet specification had a 16-bit length field, although the maximum length of a packet was 1500 bytes. Versions 1.0 and 2.0 of the
Digital/Intel/Xerox (DIX) Ethernet specification,
however, have a 16-bit sub-protocol label field called the EtherType, with the convention that values between 0 and 1500 indicated the use of the original Ethernet format with a length field, while values of 1536 decimal (0600 hexadecimal)
and greater indicated the use of the new frame format with an EtherType sub-protocol identifier.
With the advent of the
IEEE 802 suite of standards, the
SNAP header, with the
IEEE 802.2
LLC header, is used to transmit the EtherType of the packet for IEEE 802 networks other than Ethernet, as well as for non-IEEE networks that use the IEEE 802.2 LLC header, such as
FDDI. However, for Ethernet, the Ethernet Version 2 header is still used.
| EtherType | Protocol |
|---|---|
| 0x0800 | Internet Protocol, Version 4 (IPv4) |
| 0x0806 | Address Resolution Protocol (ARP) |
| 0x8035 | Reverse Address Resolution Protocol (RARP) |
| 0x809b | AppleTalk (Ethertalk) |
| 0x80f3 | AppleTalk Address Resolution Protocol (AARP) |
| 0x8100 | IEEE 802.1Q-tagged frame |
| 0x8137 | Novell IPX (alt) |
| 0x8138 | Novell |
| 0x86DD | Internet Protocol, Version 6 (IPv6) |
| 0x8819 | CobraNet |
| 0x88a8 | Provider Bridging (IEEE 802.1ad) |
| 0x8847 | MPLS unicast |
| 0x8848 | MPLS multicast |
| 0x8863 | PPPoE Discovery Stage |
| 0x8864 | PPPoE Session Stage |
| 0x888E | EAP over LAN (IEEE 802.1X) |
| 0x889A | HyperSCSI (SCSI over Ethernet) |
| 0x88A2 | ATA over Ethernet |
| 0x88A4 | EtherCAT Protocol |
| 0x88CD | SERCOS-III |
| 0x88D8 | Circuit Emulation Services over Ethernet (MEF-8) |
| 0x88E5 | MAC security (IEEE 802.1AE) |
| 0x8906 | Fibre Channel over Ethernet |
| 0x8914 | FCoE initialization protocol |
| 0x9100 | Q-in-Q |
| 0xCAFE | Veritas Low Latency Transport (LLT) |
EtherType for some common protocols
1 Internet Control Message Protocol (ICMP)
2 Internet Group Management Protocol (IGMP)
3 Gateway to Gateway Protocol (GGP)
4 IP in IP
6 Transmission Control Protocol (TCP)
8 Exterior Gateway Protocol (EGP)
17 User Datagram Protocol (UDP)
35 Inter-Domain Policy Routing Protocol (IDPR)
45 Inter-Domain Routing Protocol (IDRP)
46 Resource Reservation Protocol (RSVP)
47 Generic Routing Encapsulation (GRE)
54 NBMA Next Hop Resolution Protocol (NHRP)
88 Cisco Internet Gateway Routing Protocol (IGRP)
89 Open Shortest Path First (OSPF)