June 2007
Intermediate to advanced
600 pages
18h 19m
English
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Failover
PIX firewalls can be configured in high-availability pairs. In this configuration,
should the primary PIX fail, the secondary will take over. All PIX firewalls are capable
of being configured for failover, except the 501 and 506e models. To use this feature, the
PIX must be licensed for it. To determine whether your PIX is capable of being configured
for failover, use the show version command:
PIX#sho version | include Failover
Failover: EnabledTo be installed as a failover pair, each PIX firewall must have the same PIX software release installed. Each PIX in a failover pair must also have the exact same configuration. As a result, the hostname will be the same on both firewalls in the pair. If you attempt to configure the standby firewall, you will receive an error telling you that any changes you make will not be synchronized:
PIX#conf t
**** WARNING ***
Configuration Replication is NOT performed from Standby unit to Active unit.
Configurations are no longer synchronized.You won't actually be prevented from making the changes, though. I have stared stupidly at this message more times than I can count while making changes after working for 18 hours straight.
Failover Terminology
When in a failover pair, PIX firewalls are referenced by specific names, depending on their roles:
- Primary
The primary PIX is the firewall on the
primaryend of the failover cable. This is a physical designation. On FWSMs, or models that do not use the failover cable, the primary PIX is configured manually ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.