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Asus RT-BE86U tethering USB VPN Fusion client speed drops significantly

User1234

New Around Here
Hi, I ran into an issue that for me looks like a bug or limitation. I just cannot see it should be a configuration issue.

I got my Asus RT-BE86u active with Fusion client Wireguard for one device.

Over WAN the speed is very good (> 100 Mbps) for all devices including the device for the Fusion client.

If I disconnect the WAN and connects a USB 3 IPhone for tethering, the speed drops to below 3 Mbs for the device using the fusion, while all other devices still are good > 150 Mbps. Switching back to WAN increases the speed to normal.

The device using the Fusion client got a fixed IP and in the fusion configuration this IP must always be over the WireGuard vpn client.

This issue is annoying as I want to fast re-establish internet if the primary wan (StarLink) is down.

I tried a brand new iPhone but same issue and as the speed is only affected by the device over fusion client it appears the be something affecting this.

Is this known and any solution?
 

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