php _SERVER["REMOTE_ADDR"] is fixed ip address

[高勇KevinGao <delubi@gmail.com>]

I use debian sarge version
now I found a problem in php
when using
 getenv("REMOTE_ADDR") or
_SERVER["REMOTE_ADDR"]
return a fixed ip address,not my real internet ip address
but the same code is ok in an freebsd server
anyone can tell me why?

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