Failover, Load Balancing And High Availability - Secure Computing SG300 User Manual

Failover, Load Balancing and High Availability

Note
This section applies to SG gateway and rack mount appliances only.
The SnapGear unit supports a wide range of
configurations through which you can use
multiple Internet connections, and even multiple
SnapGear units, to help ensure Internet
availability in the event of service outage or
heavy network load.
The following Internet availability services are
provided by the SnapGear unit. They may be
configured individually, or in combination.
Internet Failover: A backup, redundant
Internet connection (or connections) that is only established should the primary link
lose connectivity
Load Balancing: Another Internet connection (or connections) concurrently with the
primary link, for spreading network load over multiple connections
High Availability: A back up, redundant SnapGear unit to monitor the status of the
primary unit, coming online and becoming the Internet gateway for your network
should the primary SnapGear unit fail
Note
SnapGear unit models SG300, SG530 and SG550 are limited to Internet availability
configurations using a single broadband Internet connection and a single dialout or ISDN
connection.
Configure Internet connections
Configure all Internet connections to use in conjunction with the SnapGear unit's Internet
availability services. Secondary and tertiary Internet connections are configured in the
same manner as the primary Internet connection, as detailed in the sections entitled
Direction Connection, ADSL, Cable Modem, and Dialout/ISDN earlier in this chapter.
Network Setup
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