How to use with OpenVPN?

[lynxthecat]

For the many of us out there that use OpenVPN, what is the most elegant way to get CAKE to work properly in this context? I believe by default QOS is applied to eth0 and so VPN traffic is just seen as a single flow to (likely) a single remote IP and port. Everything in the tunnel will look the same to CAKE. Is the solution here to change the interface(s)?

By way of background context, if I set CAKE to 5/5 I get A+ bufferbloat ratings.

But as soon as I enable my VPN via OpenVPN (NordVPN/UDP), I get terrible bufferbloat, especially on download.

So I believe that CAKE + OpenVPN is not being well handled in Asus-Merlin at the moment.

And yet this is surely a very typical use case?

See here: https://www.snbforums.com/threads/interaction-between-cake-qos-and-openvpn.73673/