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• Specify the
Probe Addresses
of two sites (the
Primary
and
Secondary
) that the B096-048/032/016 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.
Chapter 5: Firewall, Failover and Out-of-Band
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.