How to proxy all HTTP traffic from a subnet?

Question

proxy

The bottom line: there is someone else's proxy, through which the provider releases to the Internet. A pool of gray IPs has been allocated. Some IPs get access through the blacklist, some through the whitelist. White works extremely crookedly.
Purpose: to organize a network behind one of the "blacklisted" IPs.
It seems that we need another proxy, already our own, but there will not be too many proxies, because. VK on the "whitelisted" ones no longer opens, do browsers give an error about a large number of transitions? Is there any way to resolve this without getting out of the 4 network levels, in which I still understand something?
UDP Yes, and then it occurred to me, so maybe this is an elementary question, stupidly put nat right after nat to the provider, give it the necessary IP address, and register a proxy on the computers, so it will work?

Answer 1

yes, it is possible, on any cheap server outside, where there are no blockings and Internet filtering, you install vpn with support for http tunneling, for example, the popular openvpn can do this , inside a limited network you raise an openvpn client, the link says how to configure
ps in this http config, the proxy must understand CONNECT , on the other hand, if it doesn’t understand, then https wouldn’t work on it,
but even in this case it’s also possible, in some separate way, you set up a tunnel via http (on the server outside, you should raise a fictitious web server with this chip) ... any other ways no, for example, there is a tunnel through ping icmp requests, or through dns requests