While the Level One ISDN Router 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 Level One ISDN Router correctly, as described in the following sections.
It is essential that all IP packets for devices not on the local LAN be passed to the Level One ISDN Router, so that they can be forwarded to the Internet. To achieve this, the Routers must be configured to use the Level One ISDN Router as the Default Route or Default Gateway.
The local router is the Router installed on the same LAN segment as the Level One ISDN Router. This router requires that the Default Route is the Level One ISDN Router 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 Level One ISDN Router. |
Metric |
1 |
Other routers must use the Level One ISDN Router's Local Router as the Default Route. The entries will be the same as the Level One ISDN Router's local router, with the exception of the Gateway IP Address.
Beginning of Topic | Top of Document |
For the LAN shown above, with 2 routers and 3 LAN segments, the required entries would be as follows.
The Level One ISDN Router requires 2 entries as follows.
Entry 1 (Segment 1) |
|
Destination IP Address |
192.168.1.0 |
Network Mask |
255.255.255.0 |
Gateway IP Address |
192.168.0.100 (Level One ISDN Router'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 |
Destination IP Address |
0.0.0.0 |
Network Mask |
0.0.0.0 |
Gateway IP Address |
192.168.0.1 |
Destination IP Address |
0.0.0.0 |
Network Mask |
0.0.0.0 |
Gateway IP Address |
192.168.1.80 |
Beginning of Topic | Top of Document |
On the LAN tab, routing entries will appear as in the example screen below.
Figure 2: LAN Tab
To create a new entry:
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 |
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 |
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. |
Beginning of Topic | Top of Document |