Chapter 5: Firewall, Failover and Out of Band
96 Console Server & RIM Gateway User Manual
5.2.5 Set up Linux clients
The online tutorial http://www.yolinux.com/TUTORIALS/LinuxTutorialPPP.html presents a selection of methods for
establishing a dial up PPP connection:
- Command line PPP and manual configuration (which works with any Linux distribution)
- Using the Linuxconf configuration tool (for Red Hat compatible distributions). This configures the scripts
ifup/ifdown to start and stop a PPP connection
- Using the Gnome control panel configuration tool -
- WVDIAL and the Redhat "Dialup configuration tool"
- GUI dial program X-isp. Download/Installation/Configuration
Note
For all PPP clients:

Set the PPP link up with TCP/IP as the only protocol enabled

Specify that the Server will assign IP address and do DNS

Do not set up the console server PPP link as the default for Internet connection
5.3 Dial-Out Access
The internal or externally attached modem on the console server can be set up either
- in Failover mode where a dial-out connection is only established in event of a ping failure, or
- with the dial-out connection is always on
In both of the above cases in the event of a disruption in the dial-out connection, the console server will endeavor to re-
establish the connection.
5.3.1 Always-on dial-out
With V3.4 firmware (and later) the console server modem can be configured for out-dial to be always on, with a
permanent external dial-up ppp connection.
 Select the System: Dial menu option and check Enable Dial-Out to allow outgoing modem communications
 Select the Baud Rate and Flow Control that will communicate with the modem
 In the Dial-Out Settings - Always On Out-of-Band field enter the access details for the remote PPP server to
be called
Override DNS is available for PPP Devices such as modems. Override DNS allows the use of alternate DNS servers
from those provided by your ISP. For example, an alternative DNS may be required for OpenDNS used for content
filtering.
 To enable Override DNS, check the Override returned DNS Servers box. Enter the IP of the DNS servers into
the spaces provided.
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