**      $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