46 | Chapter 2 - IP Routing & Bridging |
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When you are finished adding entries, making changes, and marking dele- tions, click OK to store them in CompatiView’s edit area for the device, for later downloading. If you click Cancel, CompatiView will discard any changes and additions you made in this dialog box.
ϖNote: The “default router” is used as a “route of last resort” when your device cannot determine where an IP packet should be sent. In very simple routing setups, including connecting small networks to the Internet through an Internet Service Provider, a default router entry may be the only routing information required.
Static routes are used to provide information to the device about where IP packets should be sent when the device itself has not been able to determine a correct route for them using dynamic routing information acquired through an IP routing protocol such as RIP.
In cases where the routing metrics (i.e. the number of routing hops to a desti- nation) are equal between a static route and a dynamic route, Compatible Systems devices will use the dynamic route.
ϖ Note: Static routes are more difficult to maintain and are generally not as reliable as dynamically determined routes. We recommend that you use static routing only when the network does not provide adequate routing information through RIP.
>Destination
Enter an IP address here in decimal notation for which you wish to provide static routing information. This can be a network address or an entire host address (e.g. 198.238.9).
By convention, 0.0.0.0 is used here for a default router entry.
>Mask
Enter a mask value here to tell the device how much of the Destination Address entry should be considered when determining the route for a packet. If you simply tab into this field, CompatiView will calculate a standard mask depending on the class of the Destination Address network. For instance, 255.255.255.0 tells the device to consider only the first three octets of a packet’s address in determining whether it should be routed to the Gateway.
By convention, 0.0.0.0 is used here for a default router entry.
>Gateway
This section allows you to specify a gateway machine which is responsible for packets being sent to the Destination Address.
• If IP Address is selected, enter the IP address of the gateway.
