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arcnet.txt
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1992-11-10
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** $Filename: ARCNET.txt $
** $Revision: 1.3 $
** $Date: 92/01/10 15:18:56 $
S2WireType_Arcnet 7
ios2_DataLength:
506 byte MTU (because of the possibility of two byte Types).
Packets of size 254, 255, or 256 bytes are padded to 257 bytes before
transmition.
Station Address:
ARCNET hardware may have addresses set with jumpers, DIP switches
or software. Different drivers may therefore behave differently
with S2_CONFIGINTERFACE.
Hardware addresses should be assigned by users from highest to lowest
because there is some efficiency gained in the token passing scheme
this way. For example, on a three node network, hardware numbers 254,
253 and 252 should be used rather than 1, 2 and 3.
Raw reads and writes:
Short Packets (1-253 bytes)
Destination Address (1 byte)
Source Address (1 byte)
Count (256-N-Type length) (1 byte)
Padding (to byte number Count)
Type (1 or 2 bytes)
Data (N bytes)
Long Packets (257-506 bytes)
Destination Address (1 byte)
Source Address (1 byte)
zero (1 byte)
Count (512-N-Type length) (1 byte)
Padding (to byte number Count)
Type (1 or 2 bytes)
Data (N bytes)
Multicast: Not Supported
Broadcast: Supported
Promiscuous: Generally Not Supported
Packet Type Numbers for ARCNET are assigned by:
Datapoint Corporation
Some Common Packet Type Numbers
decimal hex description
------- --- -----------
221 DD AppleTalk
240 F0 TCP/IP -- IP (RFC 1051)
241 F1 TCP/IP -- ARP (RFC 1051)
212 F0 TCP/IP IP (RFC 1201, proposed)
213 F1 TCP/IP -- ARP (RFC 1201, proposed)
214 D6 TCP/IP -- RARP (RFC 1201, proposed)
247 F7 Banyan Vines
250 FA Novell IPX