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Netopia ISDN Router Reference Guide
Internetwork Packet Exchange (IPX)
IPX is a datagram, connectionless protocol that Novell adapted from
Xerox Network System’s (XNS) Internet Datagram Protocol (IDP). IPX
is dynamically routed, and the routing architecture works by
“learning” network addressing automatically.
IPX address
An IPX address consists of a network number, a node number, and a
socket number. An IPX network number is composed of eight
hexadecimal digits. The network number must be the same for all
nodes on a par ticular physical network segment. The node number
is composed of twelve hexadecimal digits and is usually the
hardware address of the inter face card. The node number must be
unique inside the par ticular IPX network. Socket numbers
correspond to the par ticular ser vice being accessed.
Socket
A socket in IPX is the equivalent of a por t in TCP/IP. Sockets route
packets to different processes within a single node. Novell has
reser ved several sockets for use in the NetWare environment:
Field Value
Packet Type
Description
00h
Unknown Packet Type
Used for all packets not
classified by any other type
01h
Routing Information
Packet
Unused for RIP packets
04h
Ser vice Adver tising
Packet
Used for SAP packets
05h
Sequenced Packet
Used for SPX packets
11h
NetWare Core Protocol
Packet
Used for NCP packets
14h
Propagated Packet
Used for Novell NetBIOS
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