$ _SERVER ['REMOTE_ADDR']让我只托管IP，而不是用户的IP。 为什么？

Question

Recently I've needed to change my counter code in my blog site. That is why some attackers manipulate counter numbers of my articles, using a program or anything else.

They can increment the counter to 4000 in a day. So I've changed the counter algorithm. Now I'm using a counter based on IP address. But I have a question about this. I know that $_SERVER['REMOTE_ADDR'] gives us the IP address from which the user is viewing the current page.

I taked this explanation from: http://php.net/manual/en/reserved.variables.server.php. But this command didn't give me users' IP addresses. It always gave me just hosting IP address. Why?

Could anyone explain this situation, please? Fortunately, I've found a code snippet from the github, and I can use this new counter. (https://gist.github.com/cballou/2201933)

Why just the $_SERVER['REMOTE_ADDR'] doesn't work?

Answer 1

Because some other piece of software on the server is initiating the request. This can be caused by e.g. reverse proxies or load balancers, or it may be a result of being hacked. One of the 'HTTP_*' elements of the same array should give you the real address if the bounced request is legitimate, otherwise it's time to back up all your data, wipe the server, and start over.