What is an upstream proxy and how does it work?

Heyas,

Can networking guru tell me what a upstream proxy is and how it works with a direct proxy and a transparent proxy?

Thank you.
ZackGeneral IT Goto GuyAsked:
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giltjrCommented:
All proxies do the same thing.  

Direct vs. transparent is based on if your computer is configured to use the proxy or if the proxy gets traffic forwarded to to without your computer's configuration being changed.

In Internet Explorer you can configure it to use a proxy.  This would be a "direct" proxy.

I could installed a proxy in a way that your computer knows nothing about it and that would be a transparent proxy.  Transparent proxies can physically installed in-between your computer and the rest of the network or some routers can be configured to forward traffic transparent (unknown to your computer) to a proxy.

Not sure what they mean by upstream.   Besides direct and transparent, proxies are generally called forward or reverse proxies.

Forward proxies are used by many client computers to forward to a server.

Reverse proxies sit in-front of many server computers to make they look like a single server do load balancing, SSL offload, and  caching of static content.
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ZackGeneral IT Goto GuyAuthor Commented:
Thanks for the info.
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