Me neither, I thought I could find something obvious with wireshark but in vain. I did the tests multiple times and always similar results, very low transfer rate when connected directly (wired) to the Bell router, very high and stable transfer rate ...
I fixed this issue by adding a second router (tp link) between my PS5 and the bell modem, wired speed are back at 900Mbps as they should be instead of the 47Mbps I was getting by connecting directly to the bell modem. I did some network sniffing with...
I noticed this morning that the physical port on the router was forced to 1Gb and Full duplex so I decided to put it back in "Auto" speed and "Auto" duplex mode to re-test just in case something weird in the auto-negotiation I would have missed. Same...
You should get access to your router. Now you rely on what they are saying so there is nothing to confirm nor deny if this is true or false unfortunately. I have some bad experience when they were arguing with me that I have to connect to 192.168.2.1...
By default UPnP is disabled (for security reason), if you mainly use internet for gaming, you have to enable it in the HomeHub advanced parameters menu. Then it should do it automatically. (below is the default "disable" setup)