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

Chapter 5: Firewall, Failover and Out-of-Band

5.4.2 Dial-Out Failover

The Console Servers can also be configured for dial-out failover— so a dial-out PPP connection is automatically set up in the
event of a disruption in the principal management network:
• When configuring the principal network connection in System: IP, specify Internal Modem (or the Dial Serial DB9 if
using an external modem on the Console port) as the Failover Interface to be used when a fault has been detected with
Network1 (eth0)
• Specify the Probe Addresses of two sites (the Primary and Secondary) that the Console Server is to ping to determine
if Network1 is still operational
• Select the System: Dial menu option and the port to be configured (Serial DB9 Port or Internal Modem Port)
• Select the Baud Rate and Flow Control that will communicate with the modem
Note: You can further configure the console/modem port (e.g. to include modem init strings) by editing /etc/mgetty.config
files as described in Chapter 13.
• Check the Enable Dial-Out Access box and enter the access details for the remote PPP server to be called
Note: Both SSH and HTTPS access is enabled for dial-out failover, do the administrator can SSH (or HTTPS) connect to the
console server (and its Managed Devices) and fix the problem
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
Note: 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 reestablished following three successful pings of the probe addresses during failover. The failover state
will be removed once the original state has been re-established.
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