Hi,
I have a lots of RB600, RB500 and i not have any trouble with this boards, but with 433AH (i have 33 boards) i have a lots of problem with ethernet ports.
All ethernet ports of all motherboard in random time stop to work (in the same tower the RB600 and RB500 works Great) 
Have you any idea for help me ? I have try to slow down cpu frequency, i have disabled auto-negotiation, i have try to set at 10 MB and i have tried all routeros version from 3.14 to 3.22
Thanks
Fr4
Hi, start with reset configuration.Then put in eth. cable on all ports yellow and green LEDs show link? And what you see in Router OS under /interface ethernet monitor ether1/2/3
Hi,
Thanks for response, i have this problem in all RB433, the interface monitor report link ok - 100 MB fullduplex
ig i check ip neighbour i find the other radio by eth1 link but i cant’ access in mac-telnet, before to stop to work the bandwith-test with other radios is too low (5 - 100k) in one directorion
Hello,
Please check my other posts regarding this issue,
http://forum.mikrotik.com/t/rb493ah-ethernet-ports-stop-routing-then-restarts/26396/1
and
http://forum.mikrotik.com/t/rb411-ethernet-freezes-no-receive/22193/1
Hopefully Mikrotik will resolve this serious issue. Please add your experience with this problem with as many details and tests as you can in order to help MT re-produce the problem and workaround a solution.
Many thanks
hi,
I have posted my request in both posts.
I hope that mikrotik resolve this problem because we not can work with 20 bug motherboards
Bye Fr4
p.s. i have open a poll http://forum.mikrotik.com/viewtopic.php?f=3&t=31289 for see if we are alone with this issue
Hi, just bumped to this problem after upgrading mine to version 4.3, Ether1 kept working but 2 and 3 stopped completely. No MAC, no IP communication at all. I then re-installed version 3.30 and that fixed the problem. Am back in business, but would love to have it working with the ver 4.3
We had the same problem with 4.3 on the 433ah. ether2 and ether3 wouldn’t stay working. Interface status is correct, but won’t pass any data. Downgrading to 4.2 fixed it. I have only used 4.x on this one RB, and I did it so I could try the r52n card.
Hi,
Same for me on 433ha with upgraded routeros 4.3. Ethernet 1 throughput goes up and down every 2-3 seconds.
Is it possible to get 4.2 somewhere?
Bye.
I keep all the old copies of routerOS, as I know the new versions are often russian roulette.
I can confirm that this problem exist in v4.3, but downgrading to v4.2 made it work again. You can get it by modifying the download-url for the 4.3-version.