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Proxy Servers
A proxy server is a server that sits on an intranet and takes requests for TCP/IP port 80
(World Wide Web HTML) and serves the pages from its internal cache back to the
requesting host.
Proxy servers speed up the internet perceived by the user by servicing the requests much
closer to the user than possibly can be done over the internet at large. If one or more users
on an intranet constantly refer to a web server located on the internet at large then their
aggregate response times can be greatly reduced through the use of a proxy server. The
proxy server would download the web site pages once per refresh interval and then
present them to all intranet users as they demanded them at local intranet speeds
(10Mbps, 100 Mbs or higher).
Hardware proxy servers generally have the ability to pre-fetch certain web sites as
requested by a local administrator. Pre-fetching can also load balance requests by doing
such pre-fetches off hours.
Proxy Servers are used by Internet Service Providers and large corporations to greatly
increase the speeds of their internet services and allow them to use a slower, less costly
communications carrier to achieve the same throughput. Today the prices of small office
proxy servers are approaching what even some residential and small office user can
afford. For instance, CPE Labs markets the Swell Technology Tsunami Pi Linux based
proxy server for around $1,200. This unit is self contained and can be administrated
through a browser interface thus not requiring the local user to understand or administer a
Linux host.
The DWx000 does have an internal DNS (Dynamic Named System) cache on board. It
can hold roughly 200 name resolutions for sites you browse to but not any pages or
images like a true proxy server would. Nevertheless it can certainly help speed up a users
response time by resolving host names to IP addresses locally rather than sending such
requests over the satellite link.
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