tduma

my Nano Pi r4s With everything activated cake vpn brands dscp manages 1 gb I don't know if the R3 will reach those speeds, although above it answered me that they are still correcting ppoe and IPv6 errors so I will wait and keep open wrt

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Yes it will work with PPPoE though the speeds may be limited to around 300Mbps. We think we can improve on this but it won't be in time for the launch. If you use a VPN you'll be limited to whatever can be done through it, theoretically should be the max speed that the encryption protocol can do (we don't have a figure for that at the moment). Without all that and with QoS you should see near gigabit. 
Yes Wireguard can be used

I had this issue with a tp link. Something to do with the slow cpu not handling everything and yes with qos on dropped half my speed was a joke. How companies get away with that is insane but homework seems to be the key these days as buisness is buisness and no body tells you the facts