IPX/SPX Configuration and Management Manual

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Protocol Interfaces and Services for NonStop™

IPX/SPX

IPX/SPX Configuration and Management Manual—425731-001

A-7

IPX Packet Header Format

Node

identifies a specific machine within a network. The Node field is usually related to

the physical address of the network adapter; on Ethernet and token-ring LANs, the

Node field is the same as the MAC address of the adapter or controller. IPX uses the

combination of the Network and Node fields to transmit packets within a NetWare

internetwork. Because only one filter protocol is associated with an IPXPROTO

process, the node address maps directly to a configured IPXPROTO process.

Socket

identifies the higher-level protocol and/or application within a specific node. IPX

uses the IPX packet type field and the socket number to identify the process for

which an incoming packet is intended. IPX Socket Numbers

on page A-7 describes

socket-number usage. The NonStop™ IPX/SPX subsystem provides a Sockets

interface to IPX. See Sockets Interface on page 2-7 for more information.

If the destination address of an IPX packet contains a different Network field value than

that of the source address, IPX consults the RIP table to determine the best route on

which to send the packet. (See Routing Information Protocol (RIP) on page A-3.)

IPX addresses are usually displayed in hexadecimal notation. An example of an IPX

address is 000000F2:00001B30DD8C:0451.

IPX Socket Numbers

Socket numbers allow packets received on a system to be routed to the correct protocol

or application on that system. Novell has designated certain ranges of IPX socket

numbers for specific purposes. For example, IPX delivers NCP packets to socket 451h.

Table A-3 shows IPX socket numbers and their use.

Note. An IPX socket is distinct from a Berkeley Software Distribution (BSD) socket. An

IPX socket identifies a higher-level protocol or an application within a node. A BSD socket

identifies a connection or a communication endpoint.

Table A-3. IPX Socket Number Use

Socket

Number (in

Hex.) Use

0451 NCP (on NetWare file server)

0452 SAP

0455 NetBIOS (on client)

0456 Diagnostics

4000 - 6000 Temporary sockets, used for NetWare file server interaction and other

network communications