I have a fiber internet connection to my ISP. While it is capable of gigabit speeds, I am provisioned at 50Mb/s (with my usage patterns it made no sense to pay the extra for Gb, the performance was no different...)
Originally when they set it up we ran into an issue with the ONT, it was provisioned to only see gigabit connections, so I could plug a notebook in to the ethernet jack on the wall and get an IP, but if I plugged in any router, it would not connect. They reprovisioned the ONT to auto from Gb only and now any router would get an IP. It works fine with any computer, or my DIR-655; I am actually getting ~75Mb/s on my 50Mb/s account. All is good.
EXCEPT that if I plug in the DIR-868L I get only 7-15Mb/s if I set the WAN port to "Auto". If I try anything from 10Mb through 1000Mb it does not even work (can't get an IP.) I have tried every firmware rev from 1.04 through 1.09 and none of them has any impact. Literally nothing changes on the network, I just swap the DIR-655 with the DIR-868L and the speed immediately drops. I have pinned it down to the WAN connection between the 868L and the ONT, but beyond that I am puzzled.
The reason I care is that inside the network, downloads from my NAS are ~40Mb/s on the DIR-655 and ~80Mb/s on the DIR-868L.
So literally i have one router that is fast on the outside, slow on the inside and one router that is slow on the outside and fast on the inside.
Any thoughts on what is going on here?
I can go set a static IP with a 100Mb or 1000Mb speed and see if that works and if the speed is right, but my ISP uses DHCP and I do not want to set a static IP as I may lose my lease and have to go back and reset periodically.