config setup
       virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12
       nat_traversal=yes
       protostack=netkey
       plutoopts="--interface=enp2s0"
conn l2tp-psk 
       authby=secret
       pfs=no
       auto=add
        rekey=no
       left=192.168.0.100
       leftid=242.15.43.55	
       leftnexthop=%defaultroute
       leftsourceip=242.15.43.55
       leftprotoport=17/1701
       right=105.42.19.444
       rightprotoport=17/1701