Linux install tunel

ejemplo permitir tunel a IP:PUERTO:

/etc/ssh/sshd_config

...
Match Group tunnelusers
    ForceCommand /bin/true
    AllowTcpForwarding yes
    X11Forwarding no
    PermitTunnel no
    PermitTTY no
    PermitOpen 192.168.120.30:3306
...