https://www.zerotier.com/

One of the biggest problem with zerotier was the internal dns resolution for the road warrior users.(for Android this problem was fixed by the zerotier team and i think in the near future the team will fix the problem for linux and windows too)
A little workaround for Linux systems

here 2 Simple scripts to connect the linux system to you “internal” DNS server.

Configure an zerotier edge (like an opnsense firewall or a linux system: es. https://support.zerotier.com/knowledgebase.php?entry=show&search-for=&article=ZWFhNWMyMTZjODY1ODcwNmFhZmJjYmRhN2I5MjRhOGQ_ ) as a possible  default gateway of your network from  the zero tier console on Managed Routes (add a route like 0.0.0.0/0 to <zerotier_edge_ip>

 

you can use this 2 scripts on your linux system (systemd compatible)

— For start your Session —

zerotier-start.sh:(remember to set the correct network and DNS IP in the script)

#!/bin/bash
sudo echo "DNS=<YOUR_PRIVATE_DNS_IP>" >> /etc/systemd/resolved.conf
sudo systemctl restart systemd-resolved
sudo /etc/init.d/zerotier-one restart
sudo zerotier-cli set <network> allowManaged=true
sudo zerotier-cli set <network> allowGlobal=true
sudo zerotier-cli set <network> allowDefault=true

make the script zerotier-start.sh executable

— For stop your Session —

zerotier-stop.sh:(remember to set the correct network and DNS IP in the script)

#!/bin/bash
sudo sed -i "/DNS=<YOUR_PRIVATE_DNS_IP>/d" /etc/systemd/resolved.conf
sudo systemctl restart  systemd-resolved
sudo zerotier-cli set <network> allowManaged=false
sudo zerotier-cli set <network> allowGlobal=false
sudo zerotier-cli set <network> allowDefault=false
sudo /etc/init.d/zerotier-one stop
sudo /etc/init.d/networking restart

make the file executable

And Remeber!!!! run the Stop scrtpt every time you have finished your zerotier session.