I’ve got two PC’s, but both have another IP. The simple question is how to use one of the PC’s as a proxy for the other one, by using cURL, so requests from both PC’s will have the same IP.
Is there a way to turn one PC into a proxy server and then make cURL make requests using that IP?
Yes, there are lot’s of proxy packages running out of the box (you could even configure apache to do it). Wouldn’t recommend rolling your own in PHP if that’s what you’re after. You can configure curl easily to use a proxy, see the curl_setopt possibilities.