{ config, ... }:

{
  topology.mainVpn = {
    currentNodeIP = "<VPN IPv6 address>";
  };

  networking.interfaces."${config.topology.mainVpn.interfaceName}" = {
    virtual = true;
    virtualType = "tun";
    ipv6.addresses = [ {
      address = config.topology.mainVpn.currentNodeIP;
      prefixLength = 64;
    } ];
  };
}