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- ** $Filename: ethernet.txt $
- ** $Revision: 1.2 $
- ** $Date: 92/01/10 15:18:46 $
-
-
- #define S2WireType_Ethernet 1
-
- ios2_DataLength:
- valid ethernet packets have 64 to 1500 bytes of data.
-
- Address format:
- Ethernet addresses consist of 47 bits of address information and
- a 1 bit multicast flag. The standard for expressing ethernet
- addresses is as 6 bytes (octets) in the order in which the bytes
- are transmitted with the low-order bits in a byte transmitted
- first. The multicast flag bit is the least-significant bit of the
- first byte.
-
- Ethernet addresses in a Sana2IOReq occupy the first 6 bytes of
- an address field in transmission order with the low-order bits in
- a byte transmitted first.
-
- Station Address:
- Each ethernet board must have a unique ethernet hardware address.
- Drivers will override any attempt to set the address to anything
- other than the ROM address.
-
- Raw reads and writes:
- 6 bytes of destination address,
- 6 bytes of source address,
- 2 bytes of type,
- 64 to 1500 bytes of data
- (followed by 4 byte CRC value covering all of the above
- which is hardware generated and checked, hence not included
- in even raw packets)
-
- Multicast: Supported
-
- Broadcast: Supported
-
- Promiscuous: Supported
-
- Packet Type Numbers for Ethernet are assigned by:
-
- Xerox Corporation
- Xerox Systems Institute
- 475 Oakmead Parkway, Sunnyvale, CA 94086
- Attn: Ms. Fonda Pallone
- (408) 737-4652
-
-
- Some Common Packet Type Numbers:
-
- decimal Hex Description
- ------- --- -----------
- 000 0000-05DC IEEE 802.3 Length Field
- 2048 0800 TCP/IP -- IP
- 2054 0806 TCP/IP -- ARP
- 32821 8035 TCP/IP -- RARP
- 32923 809B Appletalk
- 33011 80F3 AppleTalk AARP (Kinetics)
- 33100 814C SNMP
- 33079 8137-8138 Novell, Inc.
-