I have a question regarding VPN usage in South Korea and Saudi Arabia. I may go for short term work in either South Korea or Saudi for a few months. Does anybody have any idea, how safe it is to use a VPN as a foreigner in these countries? Worse case scenario, can I use a VPN in a Azure VM and scp torrent downloaded files or something?
VPN usage is simple to detect. I don’t know how SA deals with it. If it’s like China you may get throttled considerably and “raise flags”
I never had issues with SK but it’s been a minute. I doubt it will be an issue.
How do they detect it?
Are we talking commercial VPN like Nord or Proton? What about something like Tailscale to connect to your home network?
Sure, they could block based on your VPN provider, but they’re probably also using Deep Packet Inspection .
The ELI5 verson: It’s possible to just “watch” your traffic and notice that it’s not the “normal” https traffic (which is the most common traffic) . This can be done by finger printing the request itself or just watching the amount of traffic. For example if you “visit” a website, but upload and download 3 megabytes of data and it takes 15 minutes to send/receive that data… well, that looks suspicious… and depending on the country, you may have some people knocking on your door.
VPN and any other encrypted app traffic has telltale signals. You might not be able to decode the content, but you can see who is talking to who, how often, how long, how much data, etc.
My firewall, Palo Alto, and my dns service, Cisco umbrella, has no problem identifying people using VPNs on my networks.