Configuring IPX Type 20 Packet Forwarding
Many applications in the NetWare environment use the Network Basic Input/Output System (NetBIOS) request services from IPX servers. These services include session establishment and termination and information transfer.
On a NetWare client, a NetBIOS application using IPX broadcasts type 20 propagation packets to all IPX networks to get information about named nodes on the network. NetBIOS uses named nodes for resources on the network. To communicate with these resources, NetWare
NetBIOS uses an IPX mechanism to map named nodes to IPX address. As you have seen throughout this book, Cisco routers block all network layer broadcast packets by default, including IPX type 20 propagation packets. If a router does not forward any type 20 propagation packets, and a NetWare client with an application using NetBIOS needs to traverse the router to obtain information about a named node on the network, the NetWare client is not capable of communicating with the server.
The IOS interface subcommand
instructs the router to accept and forward type 20 propagation packets to other IPX interfaces that also have this subcom-mand configured. The IOS attempts to forward the IPX type 20 propagation packets in an
Instead of forwarding IPX type 20 propagation packets to multiple network segments, you can forward these packets to a specific IPX network address, thereby
In the following configuration on the ZIP network, we forward all IPX type 20 packets on the Singapore router, via interface Ethernet 0, to a specific IPX server in San Francisco at IPX address aa.0005.0112.0474:
Singapore# configure Configuring from terminal, memory, or network [terminal]? Enter configuration commands, one per line. End with CTRL+Z. Singapore(config)# ipx type-20-helpered Singapore(config)# interface ethernet 0 Singapore(config-if)# ipx helper-address aa.0005.0112.0474 Singapore(config-if)# ^Z
We have covered the basics of the IPX protocol suite, the
Table 6-4. Summary of EXEC Commands for Configuring IPX
Table 6-5. Summary of Configuration Commands for IPX Networks