how to fake client ip address

Anon

I need to set a fake client ip address, so that REMOTE_ADDR contains that fake ip.
I can send fake headers with referer, host, user agent:

$fp = fsockopen("www.something.com",80);
fputs($fp, "GET HTTP/1.1\n");
fputs($fp, "Host: www.fakehost.com\n");
fputs($fp, "Referer: www.fakereferer.com\n");
fputs($fp, "Content-type: application/x-www-form-urlencoded\n");
fputs($fp, "User-Agent: MSIE\n");
fputs($fp, "Connection: close\n\n");

But I need to somehow set fake remote address. Does anyone know HOW?

Thanks

Anon

If you're a hacker, the bad sort, then just go away!

Otherwise, don't worry, there's nothing to fake. That is, the webserver derives this information from your actual address when you connect, so you shouldn't need to do anything special to populate it.

Anon

I'm not a hacker. I need this in a project I'm working on. I need to change the client ip address. Is there a way to do it?

Anon

Actually, I need to know how difficult this is to do. I am putting some sensitive material online, with a PHP script to disallow any viewers who aren't from one of three static IP addresses.

Is it easy for a hacker to pose as one of those IPs and gain access to the page?

Thx,

Anon

Nevermind, I just answered my own question - it's very easy.