this post was submitted on 13 Nov 2025
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Can your ISP not tell you're using a VPN?
Would it not be easy for them to block access to VPNs if they outlaw them?
What do you do then?
I guess a better way to phrase the question is if they are outlawed how can I use one without my ISP knowing.
If your ISP can tell you're using a VPN then yes, making them illegal would prevent me from using them right?
Not necessarily. It's reasonably easy to keep long lists of known IP address ranges of known VPN providers and block access to these, but VPN traffic to a not well known IP address is generally impossible to distinguish from perfectly legal encrypted traffic such as a VPN connection to a corporate intranet. (There are also VPN protocols that are made deliberately hard to identify at all.)
It is distinguishable via deep-packet-inspection, China uses this
If it just looks like a stream of TLS packets, so the content is encrypted, what would DPI be able to see? I feel like if it could detect it as a VPN, that's just a bug that needs fixing, not an inherent weakness in the protocols involved.