3Com 2500 manual 2 shows the IPX packet format

6-4 CHAPTER 6: ROUTING WITH IPX

How IPX Routing A router operates at the network layer of the OSI Reference Model. This

Worksmeans that it receives its instructions to route packets from one segment to another from a network-layer protocol. IPX, with the help of RIP, performs these network layer tasks. These tasks include addressing, routing, and switching information packets to move single packets from one location to another. This section first describes the information included in an IPX packet that helps it get delivered and then it describes the IPX packet delivery process.

IPX Packet Format The IPX packet format consists of two parts: a 30-byte header and a data portion. The network, node, and socket address for both the destination and source are held within the packet’s IPX header.

Figure 6-2 shows the IPX packet format.

Checksum	(2 bytes)
Packet Length	(2 bytes)
Transport Control	Packet Type
(1 byte)	(1 byte)
Destination Network	(4 bytes)
Destination Node	(6 bytes)
Destination Socket	(2 bytes)
Source Network	(4 bytes)
Source Node	(6 bytes)
Source Socket	(2 bytes)
Upper-layer Data

Figure 6-2 IPX Packet Format