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ngrok (免費只能一個 process) Pagekite (免費有試用時間限制) Localtunnel (只能 http)

You may not need localtunnel or ngrok | Rodney Rehm https://blog.rodneyrehm.de/archives/38-You-may-not-need-localtunnel-or-ngrok.html

$ ssh-keygen $ ssh-copy-id user@host

• debug mode $ autossh -M 0 -N user@host -p 22 -N -R 10000:localhost:22 -vvv
• background mode $ autossh -M 0 -N -f user@host -p 22 -N -R 10000:localhost:22