SSH

SSH Keys

Create a passwordless key pair

ssh-keygen -t ed25519 -C "email@example.com" -f ./path/to/key/id_ed25519 -N ""

Tunneling

Local port forwarding

It makes remote server appears as local on a certain local port. You use as many ports as you can by using multiple -L with every port.

ssh -N -L local_port:127.0.0.1:remote_port user@host

Remote port forwarding

Sometimes called reverse tunneling. It redirects incoming traffic from the server to the client using the -R flag.

ssh -N -R remote_port:127.0.0.1:local_port user@host

Dynamic port forwarding

Creates a SOCKS5 proxy using the -D flag.

ssh -N -D 127.0.0.1:local_port user@<remote_server>

Optional flags

Resources

• SSH Tunneling Explained