for some reason at some time you need tunnel to your home, work, server etc..
and the easiest way to build it – is ssh. There are a lot of manuals in internet how to do it, but here I will keep my useful examples with description
- local port forwarding:
ssh -2 -f -N -L local_port:127.0.0.1:remote_port user@host
- 2 – Forces ssh to try protocol version 2 only
- f – Requests ssh to go to background just before command execution
- N – Requests ssh to go to background just before command execution
- L – Specifies that the given port on the local (client) host is to be forwarded to the given host and port on the remote side.
- remote port forwarding:
ssh -4 -N -f -R \*:remote_port:127.0.0.1:local_port user@server
- R – Specifies that the given port on the remote (server) host is to be forwarded to the given host and port on the local side.
- \* – specify remote server listen on all interface
- 4 – Forces ssh to use IPv4 addresses only
- ssh vpn tunnel
very good manual written on ubuntu help page: ssh_vpn tunnel