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Chapter 5 - Planning for Routing Through TCP/IP

Introduction

Specify/Change Default Gateway - Allows you to create an entry for the default gateway.

Manage Specific Routes - Allows you to create entries manually that define routes through gateways.

Manage Adjacent Networks - Allows you to create entries manually that define direct routes to networks or subnetworks.

Creating Routing Entries Automatically

The network numbers in the IP addresses of other servers in your VINES network.
The network and subnetwork numbers in the IP addresses of interfaces. If you assign an IP address to the VINES interface, the network and subnetwork numbers in the address are used to create a direct route to all the PCs running PC/TCP that have those numbers in their IP addresses. The PCs must run the PC/TCP VINES Transport version, which enables them to use the routing services of a server from anywhere in the server's VINES network. They must configure this server as their default gateway. Refer to your PC/TCP documentation for instructions.

Figure 5-1. Server 1's Knowledge of Its Network

The network numbers in the IP addresses of other servers. Obtain these numbers from the TCP/IP Server Information Worksheet.
The network and subnetwork numbers in the IP addresses you assign to interfaces. Obtain these numbers from the IP Interfaces Worksheet.

Figure 5-2. Server 1's Knowledge of Its Network (with Wrong Addresses)

Creating Routing Entries Manually

Default Gateway Planning

Figure 5-3. Default Gateway for Server 1

130.135.1.1

Default Gateways for Servers with the Routing Option

Default Gateways for Servers with the Server-to-Server Option

Planning for Managing Specific Routes

Figure 5-4. Server 1 in a Simple Topology

Figure 5-5. Server 1 in a Complex Topology

Figure 5-6. Using Other Servers Equipped with the Routing Option

Planning for Managing Adjacent Networks

Figure 5-7. Adjacent Networks

1. Using the IP Interfaces Worksheet, look at the IP address you plan to assign to each LAN interface on your server.

2. For each LAN interface, compare the network and subnetwork numbers in the IP address to the corresponding numbers in the IP addresses of the other hosts on the LAN segment. If the numbers are different, then proceed to step 3. If the numbers are the same, you do not have to manage adjacent networks.

3. Record the appropriate network and subnetwork numbers on the Adjacent Networks Worksheet. The section "Filling Out the Adjacent Networks Worksheet" later in this chapter provides information.

Figure 5-8. Adjacent Subnetworks

Defining Routes to Specific Hosts

Figure 5-9. Using a Route to a Host to Regulate Traffic

Filling Out the Routing Information Worksheet

Worksheet for Server - The name of your server.

Default Gateway - The IP address of the default gateway. If the default gateway is a VINES server accessible only across a VINES network, specify the server's name.

Interface Name - The name of each interface that IP will use. Use descriptive names such as Eth1 for an Ethernet interface or Pro1 for a ProNET-10 interface. Do not forget the interface to VINES if your server and other servers in your VINES network have the Routing option installed. You also need to consider the interface to VINES if workstations running PC/TCP will use your server as a gateway.

IP Address - Specify the address of each IP interface.

Gateways - Specify the IP address of each gateway on the interface. Write "Direct" for entries for direct routes.

Destinations - Write the IP address of each destination next to the IP address of the gateway your server uses to reach it.

Subnetwork Mask - If the destination is a network or subnetwork, write its subnetwork mask.

Type - Specify the type of destination: network, subnetwork, or host.

Auto or Manual? - Specify whether the route can be automatically created (Auto), or whether you must create it (Manual).

Figure 5-10. Sample Routing Information Worksheet (Part 1)

Figure 5-11. Sample Routing Information Worksheet (Part 2)

Filling Out the Adjacent Networks Worksheet

Worksheet for Server - The name of your server.

Interface Name - The name of each IP interface to a LAN segment that connects your server to hosts with different network or subnetwork numbers in their IP addresses.

IP Address - The IP address of each IP interface.

Destinations - The IP address of each destination network or subnetwork on each LAN segment.

Subnetwork Mask - The subnetwork mask to be used for each destination IP address.

Figure 5-12. Sample Adjacent Networks Worksheet

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