Internet-work Packet exchange (IPX)

1. Network Protocol
TOPIC : INTERNETWORK PACKET EXCHANGE
(IPX)
BY
Muhammed Sidibeh

2. BRIEF OVERVIEW
• NetWare is a network operating system (NOS) that provides
transparent remote file access .
• NetWare was developed by Novell, Inc., from the Xerox*
Network System Datagram protocol and was introduced in
the early 1980s and based on a client server architecture.
• For connecting clients to its Network operating systems a
protocol was developed which is know as IPX.
• IPX was developed by Novell based on a research center
(PARC). Its core components are Internetwork packet
exchange (IPX) , Sequenced Packet exchange), Service
Advertising Protocol (SAP) etc..

3. WHAT IS INTERNETWORK PACKET
EXCHANGE (IPX)?
IPX (Internetwork Packet Exchange) is a
networking protocol from Novell that
interconnects network that use Novell’s
Netware Clients and servers. IPX is a
datagram or packet protocol.

4. Where does it Operate in the
OSI Model?
• IPX works at the Network layer.
• Connectionless Datagram Protocol.

5. Fig 1: The NetWare Protocol Suite Maps to All OSI layers
HIGHER
LEVEL
PROTOCOLS
(NETBIOS,SAP
,NCP,SPX,NSL
P and SPX
R
E
L
I
E
S
MAC
PROTOCOLS
and IPX

6. IPX Packet Structure
The IPX packet is similar to the XNS IDP packet
and comprises two parts:
1.A 30 bytes IPX header, which includes the
network, node, and socket addresses for both
destination and source.
2.Data section, which often includes the header of
a higher level protocol, such as SPX.

7. Structure of an IPX packet
Note: The IPX header is placed after the header and before the data.

8. PACKET TYPES

9. IPX Addressing
• For intranetwork addressing, IPX uses the physical
address assigned to the network interface board.
• IPX network address uniquely identifies an IPX server on
an IPX network and individual processes within the
server.
1. A 4-byte network number (server)
2. A 6-byte node number (server)
3. A 2-byte socket number (server process)

10. Communication
1. Client-Server
• Every Netware server builds a service
advertisement table comprising all the
network resource that it is aware of.
• Client use Get Nearest Server (GNS)
request to locate servers.
2. Server-Server
• Servers use SAP and RIP

11. Client Requesting Resources from Server Via (SAP)

12. How the Performance of IPX exceed that of
TCP/IP in LAN
• IPX addresses are formed using Ethernet
MAC and 32-bit network ID.
• Highly optimized for LAN- IPX/SPX uses
per packet nacks instead of per octet acks
in TCP.
• Clients that misses a packet can be re-
read from the disk/cache and re-sent.

13. LIMITATIONS OF IPX
• Not suitable for WAN.
• Packet reordering on WAN is
omnipresent causing a lot of spurious
NAKs.
• IPX addresses are not hierarchical.

14. SUMMARY
• IPX is a networking protocol originally used by
Novell Netware Operating System.
• IPX is connectionless.
• Also referred to as a datagram protocol-
meaning each packet is treated as a single
entity.
• IPX is very easy to configure and has a small
memory footprint.

15. REFERENCES
• https://en.wikipedia.org/wiki/Internetwork_Packet_Exchange#Description
• http://searchnetworking.techtarget.com/answer/TCP-IP-vs-IPX-SPX
• http://www.powershow.com/view/3bdf3d-
M2U0M/IPX_SPX_powerpoint_ppt_presentation
• http://www.powershow.com/view/3bdf3d-
M2U0M/IPX_SPX_powerpoint_ppt_presentation

16. THE
END