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ProtonVPN
For certain pentest tasks I've found it's handy to use ProtonVPN CLI on my Kali box.
DANGER
Looks like Protoncli might not be supported anymore - see https://www.reddit.com/r/ProtonVPN/comments/1bd1o4e/protonvpn_cli_api_not_working/.
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Install (Ubuntu)
sudo apt install protonvpn-cli -y
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Login
protonvpn-cli login YOUR-USERNAME-HERE
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Connect to a random ProtonVPN server
protonvpn-cli c -r
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Disconnect from ProtonVPN
protonvpn-cli -d