PLANET Internet SOHO Router

XRT-101 / XRT-711

xDSL/Cable Access Router


Appendix C. Routing

While the Internet Access Server includes a standard routing table, this feature can be completely ignored if you do not have a router in your LAN.
If you DO have a router, it is necessary to configure BOTH the Router and the Routing table in the Internet Access Server correctly, as described in the following sections.

 

C.1 Router Configuration

It is essential that all IP packets for devices not on the local LAN be passed to the Internet Access Server, so that they can be forwarded to the Internet. To achieve this, the Routers must be configured to use the Internet Access Server as the Default Route or Default Gateway.

Default Route

C.1.1 Local Router

The local router is the Router installed on the same LAN segment as the Internet Access Server. This router requires that the Default Route is the Internet Access Server itself. Typically, routers have a special entry for the Default Route. It should be configured as follows.

Destination IP Address Normally 0.0.0.0, but check your router documentation.
Network Mask Normally 0.0.0.0, but check your router documentation.
Gateway IP Address The IP Address of the Internet Access Server.
Metric 1

 

C.2 Other Routers

Other routers must use the Internet Access Server's Local Router as the Default Route. The entries will be the same as the Internet Access Server's local router, with the exception of the Gateway IP Address.


C.2 Routing Example

Figure 1: Routing Example

For the LAN shown above, with 2 routers and 3 LAN segments, the required entries would be as follows.

C.2.1 For the Internet Access Server's Routing Table

The Internet Access Server requires 2 entries as follows.

Entry 1 (Segment 1)
Destination IP Address 192.168.1.0
Network Mask 255.255.255.0
(Standard Class C)
Gateway IP Address 192.168.0.100 (Internet Access Server's local Router)
Entry 2 (Segment 2)
Destination IP Address 192.168.2.0
Network Mask 255.255.255.0
Gateway IP Address 192.168.0.100

 

C.2.2 For Router A's Default Route

Destination IP Address 0.0.0.0
Network Mask 0.0.0.0
Gateway IP Address 192.168.0.1
(Internet Access Server's IP Address)

 

C.2.3 For Router B's Default Route

Destination IP Address 0.0.0.0
Network Mask 0.0.0.0
Gateway IP Address 192.168.1.80
(Internet Access Server's local router)


C.3 Routing Screen

This screen is reached via the Routing option on the navigation bar. An example screen is shown below.

Figure 2 Routing Screen :

C.3.1 Operation

To create a new entry:

  1. Click the Clear Form to clear the form.
  2. Enter the data as described below.
  3. Click the Add button.

To edit an existing entry:

  1. Select the entry from the drop-down list.
  2. Click the Get Data button to view the data for the selected entry.
  3. Edit the the data necessary.
  4. Click the Update button.

Other Buttons

C.3.2 Routing Table Data

An entry in the routing table is required for each LAN segment on your Network, other than the segment to which this device is attached. The data for each entry is as follows.

Destination
IP Address
The network address of the remote LAN segment. For standard class "C" LANs, the network address is the first 3 fields of this Destination IP Address. The 4th (last) field can be left at 0.
Network Mask The Network Mask used on the remote LAN segment. For class "C" networks, the standard Network Mask is 255.255.255.0
Gateway
IP Address
The IP Address of the Router on the LAN segment to which this device is attached.(NOT the router on the remote LAN segment.)
Metric The number of routers which must be navigated to reach the remote LAN segment. The default value is 1.
Interface Select the appropriate value from the drop-down list. The options are Internal (LAN) or External (WAN).


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Copyright (C) 2001 PLANET Technology Corporation