this post was submitted on 10 Aug 2023
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Can someone explain from a technical standpoint how they can block OpenVPN running on port 443? my admittedly limited understanding is that port 443 is the common port for https. If they blocked that port wouldn't that mean that they would be blocking nearly the entire internet?
From my understanding, they are most likely just blocking the defualt port of wireguard / openvpn and IPs associated with the VPN servers of VPN providers they dont like.
If they wanted to block VPN traffic over 443 to any IP, they would have to do deep packet inspection, which I would imagine is infeasible for Russia.
Supposedly, the Chinese great firewall does use deep packet inspection, so it is possible to do this at the country level.
They specifically mention it's on the protocol level which would imply it's doing more than just blocking some ports. Not sure why you'd think China could pull that off but it would be infeasible for Russia?