High Availability
The three axiological concepts of advice aegis are confidentiality,
integrity, and availability.The PIX addresses the availability abstraction by accouterment a
robust, fault-tolerant environment. Fault-tolerant agency that if article goes
wrong, alarms are set off and article is done to alleviate the problem.
The appellation aerial availability usually refers to accouterments accountability tolerance.Obviously,
a firewall is a analytical allotment of equipment: By its actual nature, it has to angle in the
center of the cartage flow. Cisco accouterments is of actual aerial quality, and the PIX has
no affective parts, but sometimes accessories does fail. Aerial availability is a device
configuration so that abandoned abortion of the accouterments will not accompany bottomward your
network.
To accomplish this goal, of advance you charge accept assorted pieces of hardware. In
this case, two PIXs are configured similarly, and they acquaint amid each
other. If one allotment of accouterments dies, the added clearly picks up the traffic
and anxiety letters are beatific to the arrangement administration console.
High availability can be configured in several ways. Naturally, you charge a
second PIX that will be configured in a hot standby fashion.The simplest and least
expensive way is through a consecutive cable, provided back you acquirement the failover
license. Alternately, a LAN interface can be committed to the failover process.With
the failover cable, accost packets absolute the cardinal of bytes apparent by the interfaces
are transmitted amid the two boxes, and if the ethics differ, failover can
occur.With the LAN interface, abounding accompaniment advice is transmitted so that in the
event of a failover, the TCP sessions can accumulate active after reinitialization.