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Bellcore Technical Journal Volume 1 Issue 1 04
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%$% Ethernet Fields $%$
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This is dedicated to The Prophet :
Below are the current lists of values known at BBN for: Ethernet
Type Fields; Ethernet Address Vendor assignments; Ethernet
Multicast Address assignments. As these values are not published
by the IEEE, we maintain these lists for OUR use, and for distribution.
Current Ethernet and IEEE802.3 "Type" Fields 5/5/88
The 13th and 14th octets of an Ethernet or IEEE802.3 packet (after the preamble)
consist of the "Type" or "Length" field. These are formerly assigned by
Xerox, currently assigned by IEEE. Some assignments are public, others private.
Information currently available includes: Xerox Public Ethernet Packet
Type documentation; IEEE802.3 Std, but not yet further documentation from
IEEE; NIC RFC960; knowledge of some BBN Private Type Field values.
Hex
0000-05EE IEEE802.3 Length Field
0600 Xerox NS IDP *
0800 DOD Internet Protocol (IP) * #
0801 X.75 Internet
0802 NBS Internet
0803 ECMA Internet
0804 CHAOSnet
0805 X.25 Level 3
0806 Address Resolution Protocol (ARP) * (for IP and for CHAOS)
0807 XNS Compatibility
081C Symbolics Private
1000 Berkeley Trailer negotiation
1001-100F Berkeley Trailer encapsulation
1600 VALID-machine protocol? *
5208 BBN Simnet Private %
6000 DEC unassigned
6001 DEC Maintenance Operation Protocol (MOP) Dump/Load Assistance
6002 DEC Maintenance Operation Protocol (MOP) Remote Console
6003 DECNET Phase IV
6004 DEC Local Area Transport (LAT)
6005 DEC diagnostic protocol (at interface initialization?)
6006 DEC customer protocol
6007 DEC Local Area VAX Cluster (LAVC)
6008 DEC unassigned
6009 DEC unassigned
8003 Cronus VLN
8004 Cronus Direct
8005 HP Probe protocol
8006 Nestar
8010 Excelan
8035 Reverse Address Resolution Protocol (RARP)
8038 DEC LanBridge Management
8039 DEC unassigned
803A DEC unassigned
803B DEC unassigned
803C DEC unassigned
803D DEC Ethernet Encryption Protocol
803E DEC unassigned
803F DEC LAN Traffic Monitor Protocol
8040 DEC unassigned
8041 DEC unassigned
8042 DEC unassigned
805B Stanford V Kernel, experimental
805C Stanford V Kernel, production
809B EtherTalk (AppleTalk over Ethernet)
80F3 AppleTalk Address Resolution Protocol (AARP)
9000 Loopback (Configuration Test Protocol)
FF00 BBN VITAL-LanBridge cache wakeups %
* These protocols use Ethernet broadcast, where multicast would be preferable.
# BBN Butterfly Gateways also use 0800 for non-IP, with IP version field = 3.
% BBN Private Protocols, not registered
E 4/29/88
Ethernet hardware addresses are 48 bits, expressed as 12 hexadecimal digits
(0-9, plus A-F, capitalized). These 12 hex digits consist of
the first/left 6 digits (which should match the vendor of the Ethernet interface
within the station) and the last/right 6 digits which specify the interface
serial number for that interface vendor.
Currently we have noted the following vendor addresses, on the
BBN Corporate Ethernet.
000093 Proteon
0000AA Xerox Xerox machines
000102 BBN BBN internal usage (not registered)
00DD00 Ungermann-Bass
020701 Interlan UNIBUS or QBUS machines
020406 BBN BBN internal usage (not registered)
02608C 3Com IBM PC; Imagen; Valid
02CF1F CMC Masscomp
080002 Bridge
080005 Symbolics Symbolics LISP machines
080009 Hewlett-Packard
080010 AT+T
080014 Excelan BBN Butterfly, Masscomp
08001A Data General
08001E Apollo
080020 Sun Sun machines
080028 TI Explorer
08002B DEC UNIBUS or QBUS machines, VAXen, LANBridges
(DEUNA, DEQNA, DELUA)
080047 Sequent
08004C Encore
080068 Ridge
080089 Kinetics AppleTalk-Ethernet interface
08008B Pyramid
08008D XyVision XyVision machines
AA0003 DEC Physical address for some DEC machines
AA0004 DEC Logical address for systems running DECNET
Ethernet addresses might be written unhyphenated (e.g. 123456789ABC),
or with one hyphen (e.g. 123456-789ABC), but should be written hyphenated
by octets (e.g. 12-34-56-78-9A-BC).
These addresses are physical station addresses, not multicast nor
broadcast, so the second hex digit (reading from the left)
will be even, not odd.
At present, it is not clear how the IEEE assigns Ethernet block addresses.
Whether in blocks of 2**24 or 2**25, and whether multicasts are assigned
with that block or separately. A portion of the vendor block address
is reportedly assigned serially, with the other portion intentionally
assigned randomly. If there is a global algorithm for which addresses
are designated to be physical (in a chipset) versus logical
(assigned in software), I am unaware of the algorithm.
Cdresses 5/5/88
Ethernet Type
Address Field Usage
Multicast Addresses:
09-00-2B-01-00-01 8038 DEC LanBridge Hello packets
1 packet per second, sent by the
designated LanBridge
AB-00-00-01-00-00 6001 DEC Maintenance Operation Protocol (MOP)
Dump/Load Assistance
AB-00-00-02-00-00 6002 DEC Maintenance Operation Protocol (MOP)
Remote Console
1 System ID packet every 8-10 minutes, by every:
DEC LanBridge
DEC DEUNA interface
DEC DELUA interface
DEC DEQNA interface (in a certain mode)
AB-00-00-03-00-00 6003 DECNET Phase IV end node Hello packets
1 packet every 15 seconds, sent by each DECNET host
AB-00-00-04-00-00 6003 DECNET Phase IV Router Hello packets
1 packet every 15 seconds, sent by the DECNET router
AB-00-00-05-00-00 ???? Reserved DEC
through
AB-00-03-FF-FF-FF
AB-00-04-00-00-00 ???? Reserved DEC customer private use
through
AB-00-04-FF-FF-FF
AB-00-04-01-xx-yy 6007 DEC Local Area VAX Cluster
(LAVC Cluster group yy)
CF-00-00-00-00-00 9000 Ethernet Configuration Test protocol (Loopback)
Broadcast Address:
FF-FF-FF-FF-FF-FF 0600 XNS packets, Hello or gateway search?
6 packets every 15 seconds, per XNS station
FF-FF-FF-FF-FF-FF 0800 IP (e.g. RWHOD via UDP) as needed
FF-FF-FF-FF-FF-FF 0806 ARP (for IP and CHAOS) as needed
FF-FF-FF-FF-FF-FF 1600 VALID packets, Hello or gateway search?
1 packets every 30 seconds, per VALID station
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