Bay Networks 5390, Administering, Page: 248 / 888

A11-2 893-741-B
Dial-up Networking
• The use of both the netact and no_start filter actions for dial-out connection interfaces. These
actions will operate as described in Filtering starting on page A13-1. However, you cannot add
a filter by using the
CLI filter subcommand add . Instead, you specify a filter definition in the
dialout section of the Model 5390 configuration file. In this definition, omit both the word add
and the name of the interface (for example, asy7). For more details, see Setting Up the
Configuration File on page A14-5.
A dynamic dialing route appears as a normal route to the end user. It has an entry in the route cache
and is advertised by the Model 5390 server (if RIP advertising is enabled; see rip_advertise on page
C2-53).When a user tries to send traffic to its destination (for example, using telnet), the connection
protocol’s process detects this traffic, establishes the phone connection by dialing into a modem,
and then continues normal operation.
Network Inactivity
Dynamic dialing resets the dial-out line when no traffic occurs on the line for a certain length of
time. Resetting the line terminates the phone connection, saving costs by stopping inactive users
from keeping phone connections open.
Enabling Dynamic Dialing
To enable dynamic dialing:
1
Obtain a valid dialout value for the Model 5390 option_key parameter. Each Model 5390
server requires a unique value.
NOTE:
With active RIP enabled on a dial-out route, RIP updates, sent
every 30 seconds, are considered activity, and reset the inactivity timer.
A filter must be applied to the dialout configuration to prevent this. A
sample filter entry for a dialout configuration is:
filter in exclu proto udp src_port router netact
filter out exclu proto udp src_port router netact
Additionally, RIP updates are not sent over an inactive/quiescent
dial-out line, and therefore do not activate an inactive/quiescent dial-out
line.