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Standard for the transmission of 802.2 packets over IPX networks (RFC1132)

IP.com Disclosure Number: IPCOM000001943D
Original Publication Date: 1989-Nov-01
Included in the Prior Art Database: 2000-Sep-12
Document File: 4 page(s) / 7K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

L.J. McLaughlin: AUTHOR

Abstract

The goal of this specification is to allow compatible and interoperable implementations for transmitting Internet packets such as the Internet Protocol [3] (IP) and Address Resolution Protocol [4] (ARP) as well as the Connectionless-mode Network Protocol [5] (CLNP) over IPX networks.

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 40% of the total text.

Network Working Group L. McLaughlin III

Request for Comments: 1132 The Wollongong Group

November 1989

A Standard for the Transmission of 802.2 Packets over IPX Networks

Status of this Memo

This document specifies a standard method of encapsulating 802.2 [1]

packets on networks supporting Novell's Internet Packet Exchange

Protocol [2] (IPX). It obsoletes earlier documents detailing the

transmission of Internet packets over IPX networks. It differs from

these earlier documents in that it allows for the transmission of

multiple network protocols over IPX and for the transmission of

packets through IPX bridges. Distribution of this memo is unlimited.

Introduction

The goal of this specification is to allow compatible and

interoperable implementations for transmitting Internet packets such

as the Internet Protocol [3] (IP) and Address Resolution Protocol [4]

(ARP) as well as the Connectionless-mode Network Protocol [5] (CLNP)

over IPX networks.

IPX is a proprietary standard developed by Novell derived from

Xerox's Internet Datagram Protocol [6] (IDP). Defining the

encapsulation of the IEEE 802.2 Data Link Layer Standard over IPX in

terms of yet another 802.X Physical Layer standard allows for the

transmission of IP Datagrams as described in RFC 1042 [7]. This

document will focus on the implementation of that RFC over IPX

networks.

Description

In general, this specification allows IPX networks to be used to

support any network protocol which can use the IEEE 802.2 Data Link

Layer specification.

More specifically, IPX networks may be used to support IP networks

and subnetworks of any class. By encapsulating IP datagrams within

IPX datagrams and assigning IP numbers to the hosts on a IPX network,

IP-based applications are supported on these hosts. The addition of

an IP Gateway capable of encapsulating IP packets within 802.IPX

datagrams would allow those hosts on an IPX network to communicate

with the Internet.

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...