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There are a number of situations where it's beneficial for caching proxies to talk to each other. There are different
A loosely coupled collection of caches is called a
hierarchy
or
mesh
. If the arrangement is tree-like, with a clear distinction between upper- and lower-layer nodes, it is called a hierarchy. If the topology is flat or ill-defined, it is called a mesh. A hierarchy of caches make sense because the Internet itself is hierarchical. However, when a mesh or hierarchy
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By now you should have a pretty good view of the web caching landscape. In the rest of this book, we'll explore many of the topics of this chapter in much greater detail, so you can fully comprehend all the issues involved. When you finish this book, you'll be able to design and
Squid is an
The Netscape Proxy Server was the first caching proxy product available. The lead developer, Ari Luotonen, also worked extensively on the CERN HTTP server during the Web's
Microsoft currently has two caching proxy products available. The older Proxy Server runs on Windows NT, while the
Volera is a recent spin-off of Novell. The product formerly known as Internet Caching System (ICS) is now called Excelerator. Volera does not sell this product directly. Rather, it is bundled on hardware appliances available from a number of OEM
Network Appliance was the second company to sell a caching proxy, and the first to sell an appliance. The Netcache products also have roots in the Harvest project.
Inktomi boasts some of the largest customer installations, such as America Online and Exodus. Their Traffic Server product has been available since 1997.
Intelligent
InfoLibria's products are designed for high reliability and fault tolerance.
The Cisco 500 series Cache Engine is a small, low-profile system designed to work with their Web Cache Control Protocol (WCCP). As your demand for capacity
Lucent's products offer carrier-grade reliability and active refresh features.
iMimic is a relative newcomer to this market. However, their DataReactor product is already licensed to a number of OEM partners. iMimic also sells their product directly.
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