Radware Alteon, Инструкция по применению

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Document ID: RDWR-ALOS-V2900_AG1302
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Chapter 17 – Application Redirection
Application redirection improves network bandwidth and provides unique network solutions. Filters
can be created to redirect traffic to cache or application servers, improving the speed of repeated
client access to common Web or application content and freeing valuable network bandwidth.
The following topics are discussed in this chapter:
• Overview, page 455 —Application redirection helps reduce the traffic congestion during peak
loads by accessing locally cached information. Also discusses how performance is improved by
balancing cached requests across multiple servers.
• Cache Redirection Environment, page 456 —Provides a step-by-step procedure on how to
intercept all Internet bound HTTP requests (on default TCP port 80) and redirect them to the
cache servers.
• RTSP Cache Redirection, page 461 —Explains how to configure Alteon to redirect data
(multimedia presentations) to the cache servers, and how to balance the load among the cache
servers.
• IP Proxy Addresses for NAT, page 464 —Discusses the benefits of transparent proxies when used
with application redirection.
• Excluding Non-Cacheable Sites, page 465 —Describes how to filter out applications that prevent
real-time session information from being redirected to cache servers.
• Content-Intelligent Cache Redirection, page 466 —Describes how to redirect cache requests
based on different Layer 7 content.
• Peer-to-Peer Cache Load Balancing, page 480 —Discusses the pattern-matching filter redirection
for load balancing peer-to-peer caches.
Note: To access application redirection functionality, the optional Layer 4 software must be enabled.
For more information, see the section on Filtering and Layer 4 in the Alteon Application Switch
Operating System Command Reference.
Overview
Most of the information downloaded from the Internet is not unique, as clients will often access a
Web page many times for additional information or to explore other links. Duplicate information also
gets requested as the components that make up Internet data at a particular Web site (pictures,
buttons, frames, text, and so on) are reloaded from page to page. When you consider this scenario
in the context of many clients, it becomes apparent that redundant requests can consume a
considerable amount of your available bandwidth to the Internet.
Application redirection can help reduce the traffic congestion during peak loads. When application
redirection filters are properly configured, outbound client requests for Internet data are intercepted
and redirected to a group of application or cache servers on your network. The servers duplicate and
store inbound Internet data that has been requested by your clients. If the servers recognize a
client's outbound request as one that can be filled with cached information, the servers supply the
information rather than send the request across the Internet.
In addition to increasing the efficiency of your network, accessing locally cached information can be
much faster than requesting the same information across the Internet.