3 ms·

Maybe 15 years ago, but today it's very sophisticated, incorporating deep packet inspection and machine learning. Under normal circumstances, they allow some VP

Maybe 15 years ago, but today it's very sophisticated, incorporating deep packet inspection and machine learning. Under normal circumstances, they allow some VPN traffic. But they ramp up the firewall during big political events, at which times it's almost impossible to gain proper connectivity.

e12e 9y ago
But there's no "deep packet" inspection of encrypted vpn or an ssh tunnel? Sure, you can guess that the connection is encrypted, and block it on general principle - but there's no way (that I know of) you could selectively block ssh based on the content/traffic pattern (you might let through low-throughput ssh only, ie: only allow use that "looks like" shell use, but a) you could run w3m on the other end of that tunnel, and b) it sounds unlikely - as that would also kill many other uses like file transfer for backup etc). I'm curious if ssh access to eg: digital ocean is allowed? If so, you can simply use ssh as a socks5 proxy: ssh -D 8080 you@example.com # Set your browser to use 127.0.0.1:8080 # as a socks5 proxy for dns lookup and # traffic, via eg foxyproxy for firefox I'm not saying GFW won't block this, but I'm doubtful it'll allow plain ssh, and block this use case?
- tluyben2 9y ago
  In my experience ssh works but tunneling over ssh does not. Not sure how they do that. Personally when I am there I only miss Google for programming issues. It is terribly inefficient to use something else imho.
  - Canada 9y ago
    The reason why tunneling over SSH doesn't work very well is because the network is crap. SSH runs on TCP, and TCP doesn't perform well when there's a lot of packet loss. Even for interactive logins it's frustrating without mosh.
    - codedokode 9y ago
      One could also distinguish between "normal" SSH and SSH used as a tunnel by used bandwidth.
- dis-sys 9y ago
  this has been blocked for ages.

e12e 9y ago

But there's no "deep packet" inspection of encrypted vpn or an ssh tunnel? Sure, you can guess that the connection is encrypted, and block it on general principle - but there's no way (that I know of) you could selectively block ssh based on the content/traffic pattern (you might let through low-throughput ssh only, ie: only allow use that "looks like" shell use, but a) you could run w3m on the other end of that tunnel, and b) it sounds unlikely - as that would also kill many other uses like file transfer for backup etc). I'm curious if ssh access to eg: digital ocean is allowed? If so, you can simply use ssh as a socks5 proxy: ssh -D 8080 you@example.com # Set your browser to use 127.0.0.1:8080 # as a socks5 proxy for dns lookup and # traffic, via eg foxyproxy for firefox I'm not saying GFW won't block this, but I'm doubtful it'll allow plain ssh, and block this use case?

tluyben2 9y ago
In my experience ssh works but tunneling over ssh does not. Not sure how they do that. Personally when I am there I only miss Google for programming issues. It is terribly inefficient to use something else imho.
- Canada 9y ago
  The reason why tunneling over SSH doesn't work very well is because the network is crap. SSH runs on TCP, and TCP doesn't perform well when there's a lot of packet loss. Even for interactive logins it's frustrating without mosh.
  - codedokode 9y ago
    One could also distinguish between "normal" SSH and SSH used as a tunnel by used bandwidth.
dis-sys 9y ago
this has been blocked for ages.