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Let me give you an example:

I use proxifier to use a proxy that uses IP from Germany. So when I check https://www.whatismyip.com/ it shows as if I'm from Germany.

So imagine if I have a software on my PC which supports working through proxy servers and I enter a French proxy different from the one from Germany. Will the admins of that software see that my IP is from France or Germany?

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This depends on the particular software. For example, if you use firefox over proxychains and set a different proxy in firefox settings, firefox will be stronger and escape proxychains. If you use whonix-gateway instead of proxychains, the traffic will be first routed through tor and then through the proxy you set in firefox, so whatismyip.com will show the proxy set in firefox this time as well. But in some cases programs might stop using proxy if they know another proxy software is in action, although I have never experienced this.

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Let's use Firefox as the software you use.

First, you proxify Firefox, and set the proxy to No proxy. Every request will be routed to Germany (e.g germany-proxy.de) and your IP will show as coming from Germany. Nothing unexpected here, right?

Next, you configure Firefox and use a proxy on France (e.g france-proxy.fr). Firefox will try to connect to france-proxy.fr, and the request is intercepted by the proxifier. The connection gets redirected to germany-proxy.de, which will establish the connection to france-proxy.fr. On this moment, france-proxy.fr thinks you are from Germany, and germany-proxy.de knows where you are. The destination have not received anything from you yet.

If Firefox connects to, let's say, Google, is france-proxy.fr the one connecting, so Google will think you are connecting from France. France will think you are connecting from Germany, and Germany knows where you live.

That's a oversimplified version of Tor. On Tor, you connect to a proxy, that connects to another one, that connects to another one . . . that connects to the destination, and every hop is encrypted.

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