Reverse proxy for tcp stream

[백종선]

Hi nginx team.
I'm trying to use nginx as reverse proxy for tcp stream.
The server behind proxy is opening linux socket , and checking ip address of connected client for some use .
But, if i use reverse proxy, ip would be proxy server ip address.
I have found for these situation , and tried proxy_bind transparency. 
But, the socket server never get connection request.
From proxy server , timed out logs are coming.
How can socket server behind proxy get real client ip address?
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