Basic setup: third ethernet interface not working

RouterOS Beginner Basics
1

Hello guys,
here a simple one for you (I am tired trying to figuring it out).

I have routeros 6.36.2 on x86.
3 interfaces in total:
ether1 → WAN (working just fine)
ether2 → LAN (working just fine)
ether3 → LAN (another one and not working)

1.- ether3 is 172.16.0.1 wich right now is connected by PoE to a single/direct mikrotik RB922 Net Metal 5 radio (172.16.0.11 in router mode). NOT WORKING.
2.- rb922 (192.168.2.1) is connected to a mikrotik rb921 net mwtal 5 radio (192.168.2.3 in router mode). This wireless link is working perfect.
3,- rb921 (192.168.3.1) is connected by PoE to a pc (192.168.3.10) with static ip. This is working just fine.

All this was working fine a few days ago but suddenly something happened (maybe my fault of course lol) so now there is no communication between ether3 and rb922 :frowning:
I can see rb922 is working fine from the user pc via webfig but i can not ping from ether3 to rb922 nor rb922 to ether3. I did tested the cable and its good.

You can check the attached picture for general details on this setup.
mikrotik-x86-core-router.png
Any ideas to fix this?
It should be a simple problem i guess.
Let me know if you need more detaisl please.
Thanks in advaced.

2

Doing more tests it seems like the pc router is properly setup as i did connect a laptop (using 172.16.0.11) on the third interfase instead of the rb922 radio and everything is working perfect.
So i am reseting the rb922 radio to do setup again and try to figure it out what is the problem then.

Anyway, this rb922 radio was also working fine with the pc router a few days ago. it had a basic router mode setup whit nothing special on it.
Any ideas?

Thanks

3

well, just in case this could help anyone else…

afther some testing and research on my company’s facilities, I did realize there was a path of cabling running many meters in the outside, where the energy cabling and the data cabling was runing together (regular energy cable inside a plastic pipe and cat6 SFTP indoor/outdoor data cable outside the plastic pipe).

Thanks to pe1chl who help me on another post about a interfase displaying wrong ethernet status info regarding this cabling issue.
http://forum.mikrotik.com/t/why-interfase-ethernet-settings-are-suddenly-changing-on-status-tab/101197/1

Good luck to anyone.