iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
iptables -t nat -A POSTROUTING -o tun0 -j MASQUERADE
iptables -A INPUT -i eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A INPUT -i tun0 -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A FORWARD -j ACCEPT
https://www.digitalocean.com/community/tutorials/openvpn-ubuntu-16-04-ru
#!/bin/sh
ngrok tcp -log stdout 22 > ~/ngrok.log &
ngrok tcp -config=/root/ngrok2.yml -log=stdout 1194 > ~/ngrok_vpn.log &
Here use two ngrok account, becouse they free. (only one conn per account is availible)