# remember to add
#PermitTunnel yes
# in /etc/ssh/sshd_config

# create tun device on both machines
# ref: http://www.k336.org/2013/04/non-root-ssh-vpn.html
sudo ip tuntap add dev tun0 mode tun user oxyflour group oxyflour

# delete tun
sudo ip tuntap del dev tun0 mode tun

# setup tun
# ref https://help.ubuntu.com/community/SSH_VPN
sudo ip link set tun0 up
sudo ip addr add 192.168.22.2/32 peer 192.168.22.1 dev tun0

# login with the created tun
ssh vlr -w 0:0