Black Box LR5100A-T - Manual (Page 28)

Applications
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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.
Edit Static Route
Location: Main
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Configuration
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IP Routing Set-up
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IP Routes
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Edit Static Route
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Destination ( IP Address & Mask)
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Next Hop
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Cost
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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
Note traffic. 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.
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