Ipx Packet Delivery; Sending Node's Responsibility - 3Com LANPLEX 2500 EXTENDEDPLEX®2500 EXTENDED User Manual

6-6 C 6: R
HAPTER OUTING WITH

IPX Packet Delivery

Network = 000000AA
Node =
Socket =
IPX
On a NetWare network, the successful delivery of a packet depends both on
the proper addressing of the packet and on the internetwork configuration.
Packet addressing is handled in the packet's Media Access Control (MAC)
protocol header and IPX header address fields.
To send a packet to another node, the sending node must know the
complete internetwork address including the network, node, and socket of
the destination node. Once the sending node has the destination node's
address, it can proceed with addressing the packet. However, the way the
MAC header of that packet is addressed depends on whether the sending
and destination nodes are separated by a router. See Figure 6-3.
Sending Node
000000000001
4003
MAC Header
Destination Node = 000000000020
Source Node = 000000000001
IPX Header
Checksum = FFFF
Packet Length = 011E
Tranport Control = 00
Packet Type = 11
Dest Network = 000000BB
Dest Node = 000000000003
Dest Socket = 0451
Source Network = 000000AA
Source Node = 000000000001
Source Socket = 4003
Data
Figure 6-3 IPX Packet Routing

Sending Node's Responsibility

When a node needs to send information to another node with the same
network number, the sending node can simply address and send packets
directly to the destination node. However, if the sending and receiving
nodes have different network numbers, the sending node must find a
router on its own network segment that can forward packets to the
destination node's network segment.
Router
Node Node
000000000020 000000000021
MAC Header
Destination Node = 000000000003
Source Node =
IPX Header
Checksum =
Packet Length =
Tranport Control = 01
Packet Type =
Dest Network =
Dest Node =
Dest Socket =
Source Network = 000000AA
Source Node =
Source Socket =
Data
Destination Node
Network = 000000BB
Node = 000000000003
Socket = 0451
000000000021
FFFF
011E
11
000000BB
000000000003
0451
000000000001
4003