Dial-Out Failover; Always-On Dial-Out - Tripp Lite B092-016 Owner's Manual

Chapter 5: Firewall, Failover and Out-of-Band
• Specify the Probe Addresses of two sites (the Primary and Secondary) that the B096-048/016 is to ping to determine
if Network (eth0) is still operational
• Then configure Management LAN Interface (eth1) with the same IP setting that you used for the main Network
Interface (eth0) to ensure transparent redundancy
In this mode, Network 2 (eth1) is available as the transparent back-up port to Network 1 (eth0) for accessing the
management network. Network 2 will automatically and transparently take over the work of Network 1, in the event Network 1
becomes unavailable for any reason.
By default, the Console Server supports automatic failure-recovery back to the original state prior to failover. The Console
Server continually pings probe addresses whilst in original and failover states. The original state will automatically be set as
a priority and re-established following three successful pings of the probe addresses during failover. The failover state will be
removed once the original state has been re-established.
5.4 Dial-Out Access
The internal or externally attached modem on the Console Servers can be set up either
o in Failover mode, where a dial-out connection is only established in event of a ping failure, or
o with the dial-out connection 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.
5.4.1

Always-on dial-out

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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