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Transparent ProxiesFrom the Internet to your SiteWhen you request the a page from the internet, the request is sent, via your ISP to the website. It responds with the webpage. This means that bandwidth is used for your ISP to retrieve the webpage from the server, then send on to you.Bandwidth is expensiveBandwidth is the amount of data sent over a specific media over a specific time. This is the real cost in networks and the internet. You may have heard terms like 56kbps or 512kbps or 4KB/sec. All these are measures of bandwidth. If the bandwidth can be saved, it's cheaper for your ISP, in turn, they may (or may not) pass on savings to you.Caches, Proxies and Caching ProxiesCaches retain information for a specific amount of time. Instead of having to keep getting the date from a remote location its returned from the cache. Internet Explorer has a cache on your PC, it stores things like images and pages so they don't have to be reloaded.Proxies handle requests for you. You send the proxy a request, it sends this on, it receives reply, and sends reply on to you. Common uses of these are to hide your identity, bypass local blocks or in caching proxies. Caching proxies combine the above two. When they receive the reply however, they cache it. If another user or you re requests that file, instead of sending request on, it replies from the cache. Caching Proxies save bandwidthWithout caching proxies, everytime I request a 1MB file, 1MB of bandwidth is being used at ISP. If I request it 10 times, that's 10MB.However, if it caches it, it only has to retrieve it that initial 1 time. The rest is free! This makes things cheaper! Transparent ProxiesTransparent proxies do not hide your IP address, they make a note of who they have forwarded it for.These are in common use by ISPs, they intercept requests, cache replies, and re-use these caches. This saves the ISP bandwidth and hence money. Some ISPs will therefore be cheaper because of this, others do not pass on savings. You will be often unaware if you use these proxies, and when using them, you are effectively often receiving old data. One recent issue is yahoo! profiles, proxies cached wrong data, causing all sorts of trouble. Are you using a transparent ProxyNoYour IP: 38.103.63.61 Setting / Disabling ProxiesProviding the proxy is not set at ISP and transparent, proxies can be disabled in Internet Explorer:Dial-Up: Tools, Internet Options, Connections. Select connection, click settings. Untick the "use proxy". Broadband: Tools, Internet Options, Connections. "Lan Settings...". Untick the use proxy box AND Automatically detection settings. Some ISPs do not intercept and force proxy, but force one to be set in your browser. If after doing either of the above webpages are inaccessible, reverse the change. |
