Synology DSM 7 docker VPN server

Hi, I don’t know if I understand your problem correctly but I would summarize like this:
0) create your network on the zerotier dashboard

  1. install docker on the Nas
  2. install zerotier in docker using the identity of the network you created
  3. install zerotier on pc and phone
  4. in the clients on pc and phone join your network
    if everything went right you are on horseback …