Sidewinder G2 6.1.2 Administration Guide - Glossary of Technical ...

Appendix D: Configuring Dynamic Routing with RIP
Configuring RIP on the Sidewinder G2
6 In the Filter type field, determine whether to allow or deny routes using the
following information:
Filtering provides the administrator the ability to both control which routes
the Sidewinder G2 uses to establish external connections, and to control
what routing information is advertised by the Sidewinder G2 from one network
to another. This control focuses on two areas.
• which external routes are added into a Sidewinder G2’s routing table
from a RIP broadcast received via the network.
• which routes in a Sidewinder G2’s routing table are advertised in a RIP
broadcast being sent to an external network.
The possible settings are:
• Allow—Specifies that only routes specifically listed will be either
accepted from the network or sent by the routed running in this burb. If
set to Allow, at least one entry must be specified in the Address/
Network/Type/Direction table, or routed cannot be enabled. Also, all
routes will be blocked from being added, including local network
interfaces, unless specifically listed in the Address/Netmask/Type/
Direction table.
• Deny—Specifies that routes are accepted and sent unless specifically
listed in the Address/Netmask/Type/Direction table.
Note: There is no provision for allowing some routes and denying other routes.
7 The Address/Netmask/Type/Direction table lists the route filter entries
currently defined for the selected burb. Use the New, Modify, and Delete
buttons to modify this table. See “Defining route filter information” on page
624 for details.
When you allow or deny a route, it can be either a host route (indicating a
path to a specific address), or a network route (indicating a path to a group
of common machines).
Route filtering is performed whenever routed is going to add a route to its
local routing table. This means that different routing filters can be applied to
different burbs.
The route filter entries highlight one of the major limitations of routed and
the RIP protocol. routed recognizes only the standard class A, class B,
and class C IP network masks (255.0.0.0, 255.255.0.0, and
255.255.255.0). The Sidewinder G2 route filter entries allow more flexible
network masks for forward compatibility.
8 Click the Save icon in the toolbar to save your routed configuration
changes.
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