RIP

Reference Manual

HOW TO use the Routing Information Protocol RIP:

The Routing Information Protocol can be quite useful on private LANs which consist of multiple subnets interconnected by gateways. For example, consider a gateway which connects subnet 172.16.2.0 and subnet 172.16.3.0. The machines on each subnet will not know how to reach the machines on the other subnet, unless a network-specific route is added to each machine on each subnet. This is tedious and error-prone, so running RIP on the gateway will be of benefit. Of course, a RIP listener will be required on each machine, but most Operating Systems such as Windows (except Windows 95), Unix, and Linux have built-in RIP support, although it must usually be explicitly enabled. NAT32 fully supports RIP, and it is enabled by issuing the command:

start rip

The NAT32 RIP implementation can be configured to not propagate or accept RIP updates on a specific interface, so it is quite safe to use in an Internet Connection Sharing environment. To disable RIP on an interface, enter the following command:

setr ifn off

where "ifn" indicates the desired Interface. The value "p" can be used to specify the Primary (i.e. the Internet connected) interface, and the value "s" can be used to specify the current Secondary (i.e. the private LAN) interface. The second argument can also be "on", if you wish to enable RIP on an interface. The default setting is to allow RIP (if it has been started) on ALL interfaces.

All versions of Windows NT4 (SP4 and later) and 2000 support a RIP Listener (sometimes called "Silent RIP"), which is enabled as follows:

Open Control Panel, Add/Remove Programs.
Click Add/Remove Windows Components.
Click Networking Services.
Check the Rip Listener checkbox.
Click OK.

For Windows 98, enable the RIP listener as follows:

Open Control Panel, Network
Click Add.
In Select Network Component Type, select Service, and then click Add.
Click Have Disk, and then type the location of the RIP listening files. They are located on the Windows 98 CD, in the \Tools\RIP directory.
Select the file Irip.inf, and then click OK.
Restart Windows 98.

Thereafter, the machine will listen for RIP broadcasts at UDP Port 520 and update its Routing Table with any new routes it learns from the RIP service running on the NAT32 (or other) RIP-capable router. The RIP updates are broadcast every 30 seconds, so all your machines will have learnt of the existence of the other subnets within 30 sec after booting.

To force NAT32 to broadcast a RIP update within the next 5 seconds, simply enter the command rip from the NAT32 Console.

SEE ALSO

Internet Connection Sharing Modules Multiple Subnets

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