topic Re: G.fast speed issue on Asus Blue Cave (RT-AC2600) in Archived Posts

G.fast speed issue on Asus Blue Cave (RT-AC2600)

digi_ben — Sat, 11 Dec 2021 13:30:57 GMT

Not sure if anyone can help on this, but I am out of ideas 😅

Recently had G.fast installed, and although the EE kit can do 300Mbps, my existing kit can only hit 38Mbps!

I have a MT992 modem (The BT Openreach one that works with G.fast), connected to my Asus Blue Cave router (RT-AC2600) and I think one of the two is causing the speed issue. But I cant see why the router would have an issue? And the mt992 is just doing its modem job, so have I got a setting wrong somewhere in my WAN page (PPPoE, MTU&MRU set to 1492)?

If anyone has had a similar issue I would love to hear it, I am really out of ideas on this one!

Re: G.fast speed issue on Asus Blue Cave (RT-AC2600)

XRaySpeX — Sat, 11 Dec 2021 13:36:17 GMT

Can you get the connection stats from the modem? And, if so, how do they compare with those from EE Smart Router?

Re: G.fast speed issue on Asus Blue Cave (RT-AC2600)

pip11 — Sat, 11 Dec 2021 14:46:19 GMT

The MT992 modem is locked down so the connection stats are not available.

A router problem culd be ruled out by connecting a PC/Laptop wired directly to the modem and setting up a direct PPPoE connection.

Re: G.fast speed issue on Asus Blue Cave (RT-AC2600)

digi_ben — Sat, 11 Dec 2021 15:33:48 GMT

I just tried the MT992 on the EE router using its WAN port, speed test came back the exact same if the EE router was plugged straight to the master socket.

So it must be something on the ASUS router end right? Anyone else ever had issues with a 3rd party router on G.fast?

Re: G.fast speed issue on Asus Blue Cave (RT-AC2600)

mikeliuk — Sat, 11 Dec 2021 16:17:58 GMT

Hi @digi_ben ,

To be absolutely sure, I would recommend having the EE router as the upstream router and connect the ASUS WAN (configured for DHCP) to the EE router LAN.

38 Mbps seems much too low to be accounted for by any reasonable bottleneck. Potentially a minor misconfiguration of the ASUS.

I would recommend to try fast.com and speedtest.net from two independent clients to see if together they can exceed 38 Mbps or if each gets roughly half of that. Obviously wired benchmarking preferred.