Applications
IP Default Gateway
An IP default gateway is an IP router that is resident on the local IP network that this router is connected to and is used to route IP frames for destination networks that do not exist in the routing table. When an IP frame is received that is destined for a network that is not listed in the routing table of the router, the router will send the IP frame to the default gateway. If the device originating the IP frame is on the same LAN as the router, the router will then send an ICMP redirect message to the originating device. Any future IP frames for that destination network will then be sent directly to the default gateway instead of the router.
A default gateway may be configured if there are a large number of routes that will pass through another router to a larger network. An example of this would be a router that is used to connect to the Internet. All of the routers on the LAN would have the Internet access router as the default gateway.
IP Static Route
With its default settings, the router will automatically learn the routes to other devices on the network through RIP messages. In some instances it may be desirable to have a predetermined or static route that will always be used to reach certain devices, such as when one specific router is to be used to reach a destination IP network. The static route will have precedence over all learned RIP routes even if the cost of the RIP learned routes is lower.
7 | Edit Static Route |
| |
| Location: Main |
| Ä Configuration |
| Ä IP Routing |
| Ä IP Routes |
| Ä Edit Static Route |
| Ä Destination ( IP Address & Mask) |
| Ä Next Hop |
| Ä Cost |
| Ä Add |
| Each static IP route is defined in the Edit Route menu. The destination |
| network IP address is specified when you first enter the menu and then the |
| IP address , alias or ID number of the next hop route and the cost may be |
| defined. Finally, select Add to add the route to the routing table. |
| Once static IP routes are defined, they may be viewed with the Show Static Routes |
| command from the IP Routes menu. |
Configuration: When the IP routing protocol is set to none, static routes will be used to route
Notetraffic. The mask size must also be defined when creating a static route entry. The subnet mask is required to allow a static route to be created to a different IP network address. See the previous section for an explanation of masks.
20
