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.
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
- The Default Route is a standard routing table entry, used as the destination for any packets where the destination is unknown.
- The Destination for the Default Route entry is usually 0.0.0.0.
- The Gateway IP Address is the device to which all packets with unknown destinations will be sent.
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 |
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.
- For a router with a direct connection to the Internet Access Server's local Router, the Gateway IP Address is the address of the Internet Access Server's local router.
- For routers which must forward packets to another router before reaching the Internet Access Server's local router, the Gateway IP Address is the address of the intermediate router.
For the LAN shown above, with 2 routers and 3 LAN segments, the required entries would be as follows.
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) |
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) |
This screen is reached via the Routing option on the navigation bar. An example screen is shown below.
To create a new entry:
To edit an existing entry:
Other Buttons
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). |
[Top of this Chapter] | ![]() |
![]() |
||
Copyright (C) 2001 PLANET Technology Corporation |