Hi,

I try to connect an iMac Pro (which has a 10G AQuantia AQtion AQC107-AFW Ethernet adapter) to a Gigabit port on a RB2011UAS-2HnD. The issue is that after a somewhat longer auto negotiation phase (~10 sec) the link speed is set to 100 Mbps. According to the status page of the Ethernet port, the router advertises all speeds up to 1000M, but it only sees 100M from the link partner. However the negotiation seems to be done, the link is not working, the client cannot get an IP from the DHCP server.
If I try to plug the iMac into a 100M Fast Ethernet port, the link is fine and the client gets an IP.
I've tried multiple CAT5 and CAT6 cables without luck.
I've tried using a USB-C Gigabit Ethernet adapter in the same port on the router and it works fine on Gigabit speed.
I've tried fiddling with the adapter settings on the mac, including setting the negotiation to manual, but it didn't work. Other computers work fine with the same Gigabit Ethernet port on the router using a 1000M link. The iMac also worked fine in the office with Gigabit speed.

Is there a known limitation with these AQuantia adapters? Should I invest time trying out another version of RouterOS or it's purely a hardware issue?

Some essential info about the config:
RouterOS: v6.45.9 Long Term
Gigabit ports I've tried: ether1 and ether5
macOS version: 10.15.5 (latest at the time of writing) (I've also tried Windows 10 using Bootcamp, the issue persists)
Ethernet port settings on the router: Auto negotiation, auto RX/TX flow control

You checked that the 8 pins of your cable are OK? If your cable is made on the fabric, anyway test it.

Regards.

You checked that the 8 pins of your cable are OK? If your cable is made on the fabric, anyway test it.

Yes, of course. I've mentioned that I tried an external USB-C adapter and I used the same cable and it worked fine on Gigabit. I've used a fully wired 3 meters long CAT6 cable, it should not be a problem.

Did you try setting the router port only to 1G ?

Also try to set 1g only on you Mac.

Anyway is weird that the auto-negociation can't do it at 1G.

As addition, is interesting to know if the same thing occurs with another RouterBOARD.

Regards.

Did you try setting the router port only to 1G ?

Yes, and also tried to change RX/TX flow control.

Also try to set 1g only on you Mac.

Anyway is weird that the auto-negociation can't do it at 1G.

As addition, is interesting to know if the same thing occurs with another RouterBOARD.

Regards.

I've tried that as well. If I force the link speed to 1G, it doesn't even establish the link. Trying another RB seems to be a good idea. I have an old RB450G somewhere, I'll try that.

Edit: 1G link works fine on the RB450G with auto-negotiation using the same OS version. It suggests that it can be a hardware-related issue with the gigabit controller in the RB2011. Any ideas how can it be investigated further?

Did you also update the RB firmware on the 2011 (is it in sync with the ROS version)?

Did you also update the RB firmware on the 2011 (is it in sync with the ROS version)?

Yes, it's updated to the latest as well.

Did you try older Mac OS?

https://discussions.apple.com/thread/8508719
https://discussions.apple.com/thread/2170974

Mac problem on horizon

Did you try older Mac OS?

https://discussions.apple.com/thread/8508719
https://discussions.apple.com/thread/2170974

Mac problem on horizon

I didn't and unfortunately can't. I work on this machine and I need the latest OS. However the posts on the forum mention a way older OS version and the original poster has issues with the external Ethernet adapter as well: "I even plugged a USB 3.0 1Gbps ethernet adapter into the system, and it connects at 100Mbps."
In my case the external USB Type-C 1Gbps adapter works fine with the RB2011. It still can be a bug in the network adapter driver, however it works fine with the older RB450G so there is definitely a difference in the negotiation.

Update: i've booted a Windows 10 instance on the iMac Pro using Bootcamp and it's still not working so I'd say it's not an OS or driver related problem. I've tried changing various settings on the adapter's control panel in Windows without any luck. I also tried to enable debug logging in WinBox hoping I'd see some diagnostic messages about the Ethernet interfaces but there is nothing in the log about that.

With default configuration how is the speed link?

Regards.

With default configuration how is the speed link?

Regards.

100M full-duplex. There is some data flowing in both directions (a few frames per sec) but the mac can't even get an IP from the DHCP.

this is without a doubt an issue with that card. searching for it brings up a ton of threads about issues with it. Not an rb2011 issue.

A similar problem.
old PC1: has a gigabit Ethernet port
new PC2: on the motherboard gigabit z590 aurus master has a 10 gigabit Ethernet port (AQC107)
router: hAP AC3

pc1 is connected to the router with a cable.(router-cable-pc1). Connection = 1 gigabit.
I take this cable out of the network connector at pc 1 (I don’t touch the end of the cable in the router) and insert it into pc2.(router-cable-pc2). Connection = 100 megabits.
Now we take out the end of this cable from the router connector (we do not touch the inserted edge of this cable into pc2) and insert it directly into pc1 (pc1-cable-pc2). Connection = 1 gigabit.

The problem is not with the cable and its connectors or the crimp. Tried 5 different Category 5e cables. They provide a gigabit connection on pc1, while on pc2 they provide 100Mbps. I tried 2 ready-made cables of category 6a. The same thing: pc1 - 1gbps, pc2 - 100mbits.
The problem is not in the ports of the router. Tried all ports and the same problem on each.
This is some kind of incompatibility with the 10Gbps Ethernet port AQC107?

Get a small (non Mikrotik) gigabit switch to place between the 2011 and the Mac.

I have to do the same thing with some game systems.

Since then I have switched to an RB4011 which works fine with the iMac Pro in question. Probably an undocumented incompatibility between the AQuantia AQtion AQC107-AFW adapter and the Atheros8327 switch chip in the RB2011. Also - just a side note - this adapter works flawlessly with the S+RJ10 SFP+ adapter on 10G.

The AC3 has exactly the same switch chip Atheros8327. And I have exactly the same problem.
I have connected a Netis 5 gigabit port switch between router and PC2. Connection = 1 gigabit. I also tested the D-link on port 24. Connection = 1 gigabit.

Let's hope that in five years the problem will be corrected
But now... +1 device (switch) in the LAN.