Firstly, I apologise if this is in the wrong section.
I have recently got a new internet connection, fttp, 100/40 mbit speed. I can my computer directly into the NBN box (UNI-D port) and dial a PPPoE and download at 16MB/s just fine. When I plug in mikrotik (RB962UiGS-5HacT2HnT) firstly with default and add in PPPoE details, then totally redone from scratch just to dial connection and run DHCP. Download speeds drop down to <1MB/s and that is just such a decrease. I did some research into fasttrack packets and set that up as well but it made no difference. I am completely lost as to where to start looking for answers, any assistance would be greatly appreciated as I have spent many an hour trying to solve this. Happy to post the full config, but I have changed it so many times I don’t know what is right or wrong anymore haha.
In Steam, verified through task manager. It is also the same speed for video drivers and other things as well. However, Speedtest dot net tests do not seem to work, but again, they do not accurately show the real download speed.
My ISP recommends “auto” but suggest they use 1492 as well, but 1492 for me cannot establish a connection. Is it worth a call through to their techs to get a definite answer?
PPPoE MTU 1480 is OK. Your ethernet MTU will be 1480+8(PPPoE)=1488. Your max TCP MSS will be 1480-20(IP)-20(TCP header)=1440. Which is also OK. So, if your ISP keep holding MTU 1500 or higher on his switches, your problem is not in MTU. Actually, it’s almost every time higher than 2k.