Using SpeedFusion Relay with Peplink Balance 310: Site-to-Site VPNs and Third-Party Routers

Hi everyone,

I have a Peplink Balance 310 5G Fiber at my central office and multiple remote sites, each using third-party routers with different WAN types (DSL, 4G/5G, fiber). Most of these sites are behind CGNAT or have dynamic public IPs. I want to set up site-to-site VPNs using SpeedFusion Relay, but I do not need inter-site communication—only between the office and each remote site.

My questions:

  1. Can I deploy SpeedFusion Relay at each site without changing the existing network setups too much?
  2. Will the SpeedFusion Relay work with third-party routers at remote sites (e.g., behind CGNAT)?
  3. Can I restrict traffic using firewall rules on my Balance 310 to control what traffic can flow between remote sites and the central office?
  4. Is it possible to block inter-site traffic (between remote sites)?
  5. If future remote sites use Peplink routers , will they integrate seamlessly without needing SpeedFusion Relay, and work the same way as those using relays?
  6. Is there a limit to how many sites could be this way? We are planning to add many more in the future.

Essentially I am looking for a solution to allow LAN-like communication between the main office and remote sites with the least amount of configuration and network engineering that will scale well in the future.

Any advice or clarification would be greatly appreciated!

Thanks!