Copyright (C) 1997, 1998 by International Business Machines Corporation

# TCP/IP Configuration Notebook Online Help

## Configuring Routing Information

This task describes how to add, change, or delete routing table entries. A routing table entry consists of the following information:

- Route type

- Destination address

- Router address

- Metric count

- Subnet mask

To do this task, use the Routing tab. To use your computer as a router, check the IP Forwarding box on the Routing tab. Routing table information is saved in the SETUP.CMD file.

Using TCP/IP through a LAN Connection and the Internet Connection Kit

If you plan to simultaneously use TCP/IP through a LAN connection and the Internet Connection Kit through a service provider, you must define the net route to your LAN. (A "net" route is one of several route types, the others being "host," and "default.")

In this case, the net route specifies the internet address of the LAN you want to access while simultaneously connected to the Internet. Once you have established a route to your network, you can access all hosts on that network.

To have TCP/IP calculate the net route for you, click the Create Default Net Route for a Given Host push button. (This is a "net" route to be used by default, not to be mistaken for a "default" route.)

Note: To create this net route you must already have a default route configured and added to the Route Type... list box (or routing table) on the Routing tab; this is what enables the Create Default Net Route... push button. The TCP/IP Configuration Notebook uses the default route address to construct a working "net" route for you automatically.

Adding this alternate net route is necessary because the default route you would normally use to connect to other computers on your LAN is ignored by Internet service providers. They use their own default, and only one default route can be active at a time.

Therefore, should you ever find yourself unable to access a computer on your LAN while connected to the Internet:

1. Log in to the TCP/IP Configuration Notebook.

2. Select the Routing tab.

3. Click the Create Default Net Route for a Given Host push button (recall that you must have a "default" route configured and added to the Routing table for this push button to be enabled).

4. Enter the IP address or host name of the computer you are trying to access.

5. Click OK on the entry window.

   The TCP/IP Configuration Notebook will then calculate the correct net route automatically.

6. Click OK at the bottom of the page to save and exit.

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