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JUNOS 10.1 Network Interfaces Configuration Guide
Applying the Dial-on-Demand Dialer Filter to the Dialer Interfaces
Dial-on-demand routing (DDR) links two sites over a public network and provides
bandwidth. An ISDN connection allows an ISDN line to be activated only when there
is network traffic configured as an "interesting" packet. An interesting packet is
defined using the firewall filter feature of the Services Router.
To configure DDR, you configure the dialer interface as a passive static route with a
lower priority than dynamic routes. If the dynamic route is lost, and a packet destined
for that IP address is received, the dialer interface initiates an ISDN connection and
sends the packet over it. When no new packets are sent to the destination, the dialer
interface initiates an inactivity timer. The ISDN connection is terminated when the
timer expires.
To configure dial-on-demand connectivity, perform the following steps:
1.
2.
3.
To define the filter, include the
firewall family inet]
To configure the firewall rule, include the
family inet dialer-filter filter-name]
To apply the filter to the dialer interface, include the
[edit interfaces dln unit logical-unit-number family family]
Example: Applying the Dialer Filter
The following example illustrates a dialer filter configuration configured at the
[edit firewall family inet]
interface.
See Figure 73 on page 881 for the topology used for this example.
880
Configuring ISDN Logical Interface Properties
isdn-options {
calling-number 5558888;
spid1 51255511110101 5551111;
spid2 51255511120101 5551112;
switch-type ni1;
t310 70;
}
dialer-options {
pool 10 priority 3;
pool 2 priority 25;
}
}
Define the dialer filter.
Configure the firewall rule.
Apply the dialer filter to the dialer interface.
hierarchy level.
hierarchy level and applied to a physical interface and a dialer
dialer-filter interesting-traffic
and
statements at the
term
from
hierarchy level.
filter dialer
hierarchy level.
statement at the
[edit
[edit firewall
statement at the
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