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4.4.6.3.4 RIP configuration
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To activate RIP for the device, select the 'Enabled' radio button for Global RIP Mode.
To configure an individual interface, select the desired RIP version and operation,
followed by placing a check in the 'Enabled' checkbox for the interface.
Click the 'Save/Apply' button to save the configuration, and to start or stop RIP based on the Global
RIP mode selected.
4.4.6.4 Policy Route
In this the Policy is that route IP packet base on the rule defined by network administrator. As a
example, we can define the policy that the packets from network A, sended out from path X, the others
sended out from path Y, or that the packets’ s TOS value is A, sended out from path F, the others
sended out from path K.
The policy route is introduced into the linux form the version 2.1 kernel. When compare with tradition
route arithmetic, the policy route mainly introduced the concept of multi route table and rule.
4.4.6.4.1 Multi route table
The tradition route arithmetic use only one route table. For some cese, we need use multi route table.
Suppose the subnet connect with internet by a router that is of two lines, the one line is of fast speed,
the other line is of slow speed. Lost of users in the subnet have no special requirement for the speed, so
they could use the slow line. but some special users have rigor requirement for the speed, so they must
use the fast line. If we use one route table, it can’t reach the aim. Route data packet base on sourec
address or other parameter, use mutl route table for mutli user’s requirement, so it can boost the
router’s performance.
4.4.6.4.2 Rule
Rule is the key concept in the policy route, we can describe rule use nation language, as a example, we
can specify these rule:
Rule one: All the packets from 192.16.152.24, use route table 10, the PRI is 1500
Rule two: All the packets use route table 253, the PRI is 32767
We can know that the rule contain three element:
Which packet would apply such rule
What action would be adopt for the packet accord with such rule, as use which table.
Which PRI of such rule, higher PRI’s rule prior match (the value more little the PRI more highter)
4.4.6.4.3 Principle
The policy route provided in the release 3.10L02 mainly bind the lan interface whih wan interface, just
the packet come in from one lan interface can be transmit from one PVC by specify.
First at the second layer, use ebtables mark the packet come in from lan interface, then at the third layer
use iproute select route path base on the mark.
Warning: thr PRI of the policy route is higher whih static route and rip route.
4.4.6.4.4 Configure
Before config policy route , need enbale port mapping fuction, after enable port mapping function,
select the menuitem “Advanced Setup”，
“Routing”,“Policy Route” in turn，will display the page
as figure 1：
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