= Linux install tunel
ejemplo permitir tunel a IP:PUERTO:<code . /etc/ssh/sshd_config>
...
Match Group tunnelusers
    ForceCommand /bin/true
    AllowTcpForwarding yes
    X11Forwarding no
    PermitTunnel no
    PermitTTY no
    PermitOpen 192.168.120.30:3306
...
</code>