3Com 6000 - page 52

5-6 CHAPTER 5: ROUTING WITH IPX

IPX Packet Delivery On a NetWare network, the successful delivery of a packet depends on the

proper addressing of the packet and the internetwork conﬁguration. Packet

addressing is handled in its 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 (network, node, and socket) of the node it

wishes to send to. 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 5-3.

Figure 5-3 IPX Packet Routing

Sending Node’s Responsibility

When a node wants 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 two nodes have different

network numbers, the sending node must ﬁnd a router on its own segment

that can forward packets to the destination node’s network segment.

To ﬁnd this router, the sending node broadcasts a RIP packet requesting the

best route to the destination node’s network number. The router residing on

the sending nodes segment with the shortest path to the destination

Network = 000000AA

Node = 000000000001

Socket = 4003 Node Node

000000000020 000000000021

Network = 000000BB

Node = 000000000003

Socket = 0451

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

MAC Header

Destination Node = 000000000003

Source Node = 000000000021

IPX Header

Checksum = FFFF

Packet Length = 011E

Tranport Control = 01

Packet Type = 11

Dest Network = 000000BB

Dest Node = 000000000003

Dest Socket = 0451

Source Network = 000000AA

Source Node = 000000000001

Source Socket = 4003

Data

Sending Node Router Destination Node

Contents

Main 3Com Corporation 95052-8154 Santa Clara, California 5400 Bayfront Plaza C ONTENTS S IG P R II A III A R P DMINISTERING A OUTING IPX R 9 IV A Page A BOUT Introduction T UIDE Conventions Table 1 and Table 2 list conventions that are used throughout this guide. LANplex 6000 Documentation Documentation Comments Page Page 1 F About LANplex Extended Switching 1-2 CHAPTER 1: LANPLEX EXTENDED SWITCHING FEATURES Using Menus to Perform Tasks Option Descriptions Options (These vary per level of access.) Using Menus to Perform Tasks 1-3 Figure 1-1 IP Menu Hierarchy 1-4 CHAPTER 1: LANPLEX EXTENDED SWITCHING FEATURES Figure 1-2 IPX Menu Hierarchy Page Page 2 SWITCHING SOFTWARE About Installing Software Copying Software to a Hard Disk Page Page Loading Software Page Page Page Page 3 S What is Routing? Page Page Bridging/Routing Models Page Page Page Page 4 IP Routing and the OSI Model The Elements of Page Page Page Page Page Page IP Routing Transmission Errors IP Routing References IPX Routing in the NetWare Environment ROUTING WITH IPX Page Page How IPX Routing Works Page Page Page The Elements of IPX Routing Page Page Page Page Page Page Page Page About AppleTalk AppleTalk Network Elements ROUTING WITH APPLETALK Page Page AppleTalk Protocols Page Page Page Page Page About AARP Page Page Page Page 7 Page Page Page Page Page Page 7-8 CHAPTER 7: ADMINISTERING IP ROUTING Removing a Route To remove a route: ip route remove ip route flush ip route default Administering the ARP Cache Page Administering UDP Helper Page Enabling/ Disabling IP Setting the RIP Pinging an IP Station Displaying IP The IP statistics you can view are described in Table 7-2. To display IP statistics: 8 Page Page Page Page Page Administering Routes 8-7 6Enter the node address of the route. A static route is dened in the following example: Removing a Route To remove a route: ipx route remove ipx route flush Administering Servers Page 8-10 CHAPTER 8: ADMINISTERING IPX ROUTING Removing a Server To remove a server: ipx server remove ipx server flush Setting IPX Setting the RIP Setting the Enhanced RIP Setting the SAP Displaying Displaying Statistics 8-15 Displaying IPX RIP Statistics To display IPX RIP statistics: The IPX RIP statistics you can view are described in Table 8-2. ipx statistics rip Statistics appear as in the example below: Displaying IPX SAP Statistics To display IPX SAP statistics The IPX SAP statistics you can view are described in Table 8-3. ipx statistics sap Statistics are displayed, as shown in the example below: Page Page 9 R Page Page Page Page Administering the AARP Cache Administering the AARP Cache 9-7 Displaying the AARP Cache appletalk aarp display Displaying the Zone Table Displaying the Zone Table 9-9 appletalk zone display network Zone Table by Network Numbers Zone Table by Zones OR appletalk zone display zone Conguring Conguring Checksum Pinging an AppleTalk Node Viewing Appletalk The AppleTalk DDP statistics you can view are described in Table 9-1: Displaying RTMP To display RTMP statistics: The RTMP statistics you can view are described in Table 9-2: Displaying ZIP To display ZIP statistics: The ZIP statistics you can view are described in Table 9-3: 9-16 CHAPTER 9: ADMINISTERING APPLETALK ROUTING Displaying NBP appletalk statistics nbp Table 9-3 ZIP Statistics (continued) Page Page Page Page A On-line Technical Services Page Support from Your Network Supplier Support from 3Com Returning Products for Repair I Numerics A B C D E F G H L M N O P R S T U Z