If you are referring to post #10, he never said that it was the first step. He only said it was an . He avoided giving much useful information though.
So my guess is that “internal router ip” was the ISP assigned ip on the pppoe interface.
But as you said it doesn’t explain the difference between 7.2rc2 and 7.2 given the claims in post #13
In my opinion which is evidently different than @tangent’s, when using a pppoe interface, you should be clamping mss to a maximum of 1452 in both directions. (During the 3 way TCP handshake, each side can tell the other the maximum segment it can receive. Your PC client will be happy to receive 1500, and the remote host will be happy to receive 1500, but you want to make sure the other side is told your PC can only receive 1492, and if the other side says it can receive 1500, you want that to be reduced to 1492 as well)
I have not configured an MikroTik router with a pppoe interface, only EdgeRouters. On the EdgeRouters, the setup wizard does this for you and uses a conservative value of 1412 by default, by you can change to 1452. Some users claim that 1412 is more optimal than 1452 when using DSL (due to ATM) but I don’t think there is probably much effective difference between the two.
But I am also not convinced by any evidence that has been provided, that it worked differently with v7.2rc2
@tikker, can you reload v7.2rc2 and verify that it works without the mss clamping, I think that is what your original claim was.