Dual WAN slow

I have setup dual WAN with load balancing. ISP 1 is Starlink, ISP 2 is a 4G/5G router (tp-link archer NX200). Both ISP 1 and 2 are DCHP. I’m having an issue with the speed of ISP 2. If I connect to the WiFi hotspot of the 4g/5g router itself and do a Speedtest I’m consistently getting speeds in the region of 80-175mb/s depending on where I position it. If I connect an Ethernet cable to the 4g/5g router and plug it into Firewalla, doing a Speedtest for ISP 2 via the firewall app results in a speed in the region of 30mb/s. Doing a Speedtest in my browser sees similar results. I have checked a few things such as swapping the cable out, connecting the router to the Firewalla directly (as opposed to through my home network points) and looking at the admin panel for the 4g/5g router (says the port speed is 1000mb/s). Is there a logical next step? Any help greatly appreciated!

Firewalla

April 02, 2025 17:36

When you are running speedtest, double check if both browser tests, are using the same test server. Since LTE may not always be perfectly stable, make sure you are doing the tests at the same time.

I also assume your tests are all ethernet-based?

mystiko

April 02, 2025 18:02

Sorry I should clarify further.

My home is networked. I also have Aruba access points. The Firewalla is the heart of everything. If the LTE router is fed into the Firewalla as ISP 2 then I do a Speedtest of ISP2 via the Firewalla app then it’s consistently 30mb/s.

If I connect to the LTE router via its own WiFi network and do a Speedtest on a device over this WiFi connection it’s significantly faster.

April 02, 2025 18:22

Did you ever do a test

PC/MAC --> ethernet --> Firewalla --> LTE

PC/MAC --> Ethernet --> LTE

April 02, 2025 19:27

I will try this tomorrow and feedback!

Dual WAN slow

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