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Proxy hides real IP

Posted on 2003-12-09
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Last Modified: 2010-04-05
Dear Experts,

I just created the proxy, based on TIdTCPMapping Indy component, and I have a huge problem - the destination server can't see the original client IP. For example, user from 11.11.11.11 connects to my proxy at port 2525 then proxy redirects request to server at port 25, but server always see host IP where proxy is running (in my case 127.0.0.1), so real IP 11.11.11.11 is hidden! How can I get rid of this proxy "feature"? I know there can be low-level NDIS, LSP and TDI stuff, but I'm not C++ programmer.

TIA,
dumb
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Question by:iam_dumb
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Accepted Solution

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gmayo earned 250 total points
ID: 9910710
That's the general idea of a proxy server. You pass info to the proxy, it forwards it onto the destination with its own IP address as the return address, which then gets forwarded back to you by the proxy. What protocol are you using - HTTP? The proxy obviously needs to remember which client requested it, so it would normally store the client address somewhere, but that depends on the protocol as to exactly where.

Geoff M.
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Author Comment

by:iam_dumb
ID: 9911259
I use SMTP, and since proxy hide real IP address, many security features of mail server, based on sender IP, become useless.
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