BT Home Hub 5 Type A SQM Speeds

What type of speeds can this handle with cake? Is 55 Mbps asking too much?

Thank you

Depends on the connection type.

As a WiFi router (no DSL) it is good up to 40 Mbps.

Roughly speaking, yes.
lantiq vr9 isn't a fast SOC, even without SQM it's hard at the limit around 85-90 MBit/s and needs software flow-offloading to achieve ~100 MBit/s, but SQM is a quite major performance hog (and software flow-offloading effectively gets neutered by using sqm).

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I never tried sqm on lantiq myself, only without sqm, but my rough guess would be around 50 MBit/s, +/-25%, you will have to determine the 'exact' limit yourself.

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When I tried a BTHH5A as all in one OpenWrt WiFI router (dsl 50/10, wifi, nat, firewall, sqm 45/9) it was barely able to manage and only if I was not using WiFi while loading the wan link... this clearly was too much for that device and I changed it to operate as bridged modem only which worked up to around 120 Mbps combined up- and download (on a 100/40 link).

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@patrakov @slh @moeller0

Thank you for the info. I guess it's not fit for purpose. I could try without SQM I guess.

Random question while I'm here but will OpenWRT allow "DHCP spoofing" mentioned here (particularly the comments): https://www.reddit.com/r/HomeNetworking/comments/l1er0h/connecting_hg612_and_eero_uk/

moeller0 idea of just making it a bridged modem gave me the idea that maybe OpenWRT allowed the above. The Eero does not support PPPoE directly but if the above worked I could then just have the Eero handle stuff with cake which is fine up to 500 Mbps. Unlikely as it's a really janky setup but thought I would ask... for science.

I honestly do not know...