RFC 1132 (rfc1132) - Page 2 of 4

Standard for the transmission of 802

RFC 1132            802.2 Packets over IPX Networks        November 1989


Maximum Transmission Unit

   The maximum data size of a IPX datagram is 546 bytes.  As the
   combined size of the 802.2 LLC and SNAP headers is 8 bytes, this
   results in a Maximum Transmission Unit (MTU) of 538 bytes.

Address Mappings

   The mapping of Internet Protocol addresses to 802.IPX addresses is
   done using the Address Resolution Protocol in the same fashion as
   with other IEEE 802.X physical addresses.  However, the length of an
   802.IPX physical address is 10 bytes rather than 2 or 6.  This 10
   byte physical address consists of the 4 bytes of the IPX network
   address followed by the 6 bytes of the IPX node address.

Byte Order

   The byte transmission order is "big-endian" [8].

Broadcast Addresses

   IPX packets may be broadcast by setting the IPX header Packet Type
   field to 0x14, the Destination Network field to the local network
   number, the the Destination Node field to 0xffffff, and the Immediate
   Address field of the IPX Event Control Block to 0xffffff.

Unicast Addresses

   IPX packets may be unicast by setting the IPX header Packet Type
   field to 0x04, the Destination Network field and Destination Node
   field to those values found by address resolution, and the Immediate
   Address field of the IPX Event Control Block to the physical address
   of the destination node or the appropriate IPX bridge.

Checksum

   Like most IPX applications, this specification does not use IPX
   checksum.

Reserved values

   The IPX socket 0x8060 has been reserved by Novell for the
   implementation of this protocol.

Implementation

   The encapsulation of Internet packets within IPX networks has proved
   to be quite useful.  Because the IPX interface insulates knowledge of



McLaughlin