Reduced speed on Asus AC300 with hub 3 in modem mode

[frootloops]

Hi, 

I'm having a problem where my asus ac3000 router isn't giving me my full broadband speed.  I'm on the M200 package, or whatever it's called.  Using the superhub3 as a router I get full speed.  Putting the superhub into modem mode and using my ac3000 for routing I get roughly half speed.  This is the same for wired and wifi.  The screenshots linked to show the difference between the two.

https://ibb.co/ypPh9Qn
https://ibb.co/Qc37P13

I can't find/don't know what to look for that might be the cause of this, so any pointers would be appreciated

cheers

[gary_dexter]

Are you actually in Ireland ?

Check there’s no QOS settings enabled on the ASUS. 

[frootloops]

No I'm not in Ireland, I don't know why Fing always says that.

I'll take a look again, but as far as I can see all QoS is turned off

[gary_dexter]

Use a Speedtest local to you on Speedtest.net

Going to Ireland adds latency. 

[frootloops]

have done that too, no difference unfortunately. And both screenshots show it was going to ireland anyway so if it was adding latency for one I guess it was adding latency for the other?

[gary_dexter]

Has to be a setting in the router then. 

is hardware acceleration enabled?

[frootloops]

I've tried with "NAT acceleration" (the only setting I can find referencing acceleration,  jeez I hate the ui of these routers) on and off,  jumbo frames also on and off.  Neither made any difference it seems 😞

[legacy1 · Accepted solution]

get some new cables
https://www.amazon.co.uk/1aTTack-Ethernet-Network-Double-Shielded/dp/B004WCQB9G/ref=sr_1_3?crid=12DY...

[frootloops]

I don't believe it!  I had bought a pack of decent cables and everything was wired up with them......except the modem > router link.  Absolutely no idea how I managed that. Jeez do I feel stupid now!

Thanks for that suggestion that made me check everything again 🙂