While
the Internet Gateway 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 Gateway 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 Internet Gateway, so that they can be forwarded to the Internet. To achieve this, the Routers must be configured to use the Internet Gateway as the Default Route or Default Gateway.
The local router is the Router installed on the same LAN segment as the Internet Gateway. This router requires that the Default Route is the Internet Gateway 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 Gateway. |
Metric |
1 |
Other routers must use the Internet Gateway's Local Router as the Default Route. The entries will be the same as the Internet Gateway'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 Internet Gateway 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 (Internet Gateway'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 |
This
screen is reached via the Routing option on the
Advanced or LAN-to-LAN screen.
Default Route
To create a new entry:
Note the limitations on names:
To search for an existing entry:
The search facility is browser-dependent, but functions in most browsers. If your browser provides this facility, it will work in any selection list. Operation is as follows:
To delete an existing entry:
To change the details for an existing entry:
Beginning of Topic | Top of Document |
This
screen is shown when you click the Create of Modify button on the
Routing screen.
Sample Screen (Click to view)
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.
Name |
The name can not be changed. |
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 routers which must be navigated to reach the remote LAN segment. The default value is 1. |
Interface |
Select the appropriate item from the drop-down list. The options are E0 (LAN),W0 (WAN Port 1), W1 (WAN Port 2). |
Beginning of Topic | Top of Document |