September 2002
Intermediate to advanced
560 pages
13h 16m
English
As the need for high availability and high levels of fault tolerance grows, it is imperative that network services and hardware be available at all times, even during upgrades. At the same time, packet processing has moved from simple IP routing to content-based routing and stateful inspection of content—whether it be firewall, VPNs, NAT, or authentication. The issue of availability alone can be solved by providing redundant devices. However, during failover to a redundant device, it is very difficult to preserve state for all of these different applications. The only way to preserve state and make the failover or load sharing completely transparent is to have the physical device act as ...
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