Previous PageNext Page

Chapter 9 - Managing Routing Through TCP/IP

Introduction

Manage the default gateway entry
Manage specific routes
Manage adjacent networks
Enable and disable directed broadcasts

Worksheets

Figure 9-1. Sample Routing Information Worksheet (Part 1)

Figure 9-2. Sample Routing Information Worksheet (Part 2)

Figure 9-3. Sample Adjacent Networks Worksheet

Accessing TCP/IP Routing Functions

Slot - The number of the slot in which the interface's LAN card resides. This field does not apply to the VINES interface.

IP address - The interface's IP address.

Subnetwork mask - The subnetwork mask that was specified for the interface's IP address.

Default Gateway Management Tasks

Specifying the Default Gateway
Changing the Default Gateway
Deleting the Default Gateway

Specifying the Default Gateway

If the default gateway is a VINES server accessible only through VINES, use the Manage Routing through VINES Networks menu to add an entry for the server. Refer to Chapter 10 for instructions.
If the default gateway is a foreign host gateway or a VINES server accessible only through IP, you must either define a direct route to the gateway or specify the interface that connects your server to the gateway. Refer to this chapter for instructions.

1. At the Manage Routing through TCP/IP Networks menu, choose SPECIFY/CHANGE Default Gateway.

2. The TCP/IP configuration program asks if the gateway is a VINES server accessed only through VINES. Specify YES or NO.

3. If you specified YES in step 2, you see a list of the servers in your VINES network that were specified through the Manage Routing through VINES Networks function. Choose the appropriate server.

If you specified NO in step 2, the Specify/Change Default Gateway screen appears. Specify the IP address of the foreign host gateway that will act as the default gateway.

Changing the Default Gateway

Deleting the Default Gateway

1. At the Manage Routing through TCP/IP Networks menu, choose DELETE Default Gateway.

2. The configuration program prompts you for confirmation. Specify YES to delete the default gateway, or NO to cancel the deletion. YES is the default.

Specific-Route Management Tasks

Adding a Route
Modifying a Route
Deleting a Route

1. At the Manage Routing through TCP/IP Networks menu, choose MANAGE Specific Routes.

2. Select the interface for which you are managing specific routes.

Gateway - The IP address of the gateway.

Dest Type - The type of destination. The destination type can be Network (which includes subnetworks) or Host.

Dest IP address - The IP address of the destination. For the default gateway entry, no IP address is shown, since the default gateway does not define a specific route to a destination.

Subnetwork mask - The subnetwork mask for the destination IP address.

Status - The route's status, either in use (the route can be used) or NOT in use (the route is unusable).

Adding a Route

The IP address of a gateway.
The IP address of a destination. The destination can be either a network, a subnetwork, or a host.
The subnetwork mask if the destination is a subnetwork.

Adding a Route to a Network or Subnetwork

1. At the Manage Specific Routes menu, choose ADD a Route.

2. Enter the IP address of the route's gateway. Using the sample worksheet in Figure 9-1, you would enter 145.179.1.2 for a route to network 147.190.

3. The configuration program asks if the destination you want to specify is a host. Specify NO (the default).

4. At the Specify Destination IP Address screen, enter the IP address of the destination network or subnetwork. Using the sample worksheet, you would specify 147.190 as the destination network that can be reached through 145.179.1.2.

5. At the Specify Subnetwork Mask screen, enter the subnetwork mask if the destination is a subnetwork. Use the default if you specified a non-subnetted network as the destination - for example, 255.255.0.0 for 147.190.

6. The configuration program asks if you want to reach any more destinations through the gateway you specified. In our example, the configuration program would ask if you want to reach any more destinations through 145.179.1.2.

If you answer YES, the Specify Destination IP Address screen appears, allowing you to specify another destination that can be reached through the gateway. Follow the steps in this procedure, beginning at step 3, to add another entry. If you answer NO, the program returns to the Manage Specific Routes menu.

Adding a Route to a Host

1. At the Manage Specific Routes menu, choose ADD a Route.

2. Enter the IP address of the route's gateway. Using the sample worksheet in Figure 9-1, you would enter 145.179.1.2 for a route to network 147.190.

The configuration program asks if the destination you want to specify is a host. Specify YES.

3. At the Specify Destination IP Address screen, specify the IP address of the destination host that can be reached through the specified gateway.

The configuration program asks if you want to reach any more destinations through the gateway you specified. Specifying YES enables you to specify another destination. Specifying NO returns you to the Manage Specific Routes menu.

Modifying a Route

1. At the Manage Specific Routes menu, choose MODIFY a Route.

2. Choose the route entry you want to modify. You then can proceed to modify entries on the route configuration screens. The preceding section, "Adding a Route," provides information on these screens.

Deleting a Route

1. At the Manage Specific Routes menu, choose DELETE a Route.

2. Choose the route you wish to delete.

3. The configuration program prompts you for confirmation. Specify YES to delete the entry, or NO to cancel the deletion. YES is the default.

Adjacent Network Management Tasks

Adding an Adjacent Network
Modifying an Adjacent Network
Deleting an Adjacent Network

The interface associated with the adjacent network
The IP address of the adjacent network or subnetwork to which you are creating a route
The subnetwork mask for the IP address

1. At the Manage Routing through TCP/IP Networks menu, choose MANAGE Adjacent Networks.

2. Choose the interface that connects your server to the network or subnetwork to which you want to define a direct route. The Manage Adjacent Networks menu appears.

IP Address - The IP address of the adjacent network or subnetwork.

Subnetwork Mask - The subnetwork mask for the IP address.

Status - The status of the interface, either in use or NOT in use.

Adding an Adjacent Network

The IP address of an adjacent network or subnetwork
The subnetwork mask for the IP address

1. At the Manage Adjacent Networks menu, choose ADD an Adjacent Network.

2. At the Configure an Adjacent Network screen, specify the IP address of the network or subnetwork to which you are defining a direct route. Using the sample worksheet in Figure 9-2, you would enter 135.126.2.

3. At the Specify Subnetwork Mask Screen, specify the subnetwork mask if you specified a subnetwork as the destination. Use the default if you specified a network as the destination. For example, 255.255.255.0 would be the default for network 135.126.2.

Caution: If you specify an IP network address with no subnetwork mask, routes elsewhere in your network will not be usable if they meet the following criteria:

- They have the same network number as the network you established.

- They use a subnetwork mask.

Modifying an Adjacent Network

1. At the Manage Adjacent Networks menu, choose MODIFY an Adjacent Network.

2. Choose the adjacent network you want to modify. The configuration program steps you through the same screens that were used to add the network. The preceding section, "Adding an Adjacent Network," provides information.

Caution: If you specify an IP network address with no subnetwork mask, routes elsewhere in your network will not be usable if they meet the following criteria:

- They have the same network number as the network you established.

- They use a subnetwork mask.

Deleting an Adjacent Network

1. At the Manage Adjacent Networks menu, choose DELETE an Adjacent Network.

2. Choose the adjacent network you wish to delete.

3. The configuration program prompts you for confirmation. Specify YES to delete the adjacent network, or NO to cancel the deletion. YES is the default.

Server Management Options for TCP/IP Routing

Enabling and Disabling Directed Broadcasts
Displaying System Routes

Enabling and Disabling Directed Broadcasts

1. At the Manage Routing through TCP/IP Networks menu, choose ENABLE/DISABLE Directed Broadcasts.

2. The configuration program asks you to confirm your decision. Specify YES or NO. YES is the default. For example, if directed broadcasts were enabled, you would specify YES to disable them, or NO to keep them enabled.

Displaying System Routes

1. Select DISPLAY System Routes from the Manage Routing through TCP/IP Networks menu.

2. Select the interface associated with the routes you wish to view.

The next screen displays all the entries for the routes in use. The following information appears for each entry:

Gateway - The IP address of the gateway on the route.

Dest Type - This field provides information about the kind of destination that can be reached by way of the route. The destination can be any one of the following:

Network - A network or subnetwork.
Host - A host.
Direct - An automatically created network or subnetwork route.
Adjacent - A directly connected network or subnetwork.
Default - All destinations that can be reached through the default gateway, including networks, subnetworks, and hosts. The default gateway is used when no other routes in use provide a gateway to a destination.

Dest IP Address - The IP address of the destination network, subnetwork, or host.

Pkts Fwd - The number of packets forwarded to the destination that can be reached by way of this route.

Sts - The route's status, either UP (the route can be used), or DOWN (the route is unusable).

Flags can be any one of the following:

Manual - The route was manually defined.
Automatic - The configuration program defined the route using the IP address assigned to the selected interface.
Dynamic - The route was created using information from an ICMP redirect packet.
Modified - The route was created manually or dynamically and was updated based on information from an ICMP redirect packet.

Previous PageTop Of PageNext Page