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Yaraab2044
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Link down link up speed 10 ??? Why

Tue Sep 12, 2017 12:41 am

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why?
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pcunite
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Re: Link down link up speed 10 ??? Why

Wed Sep 13, 2017 1:02 am

Interesting ... sorta port flapping. What is connected on that port?
 
Jefte
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Re: Link down link up speed 10 ??? Why

Wed Sep 27, 2017 11:01 pm

I have same problem in some routerboards...;((
 
Tdaddysimi
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Re: Link down link up speed 10 ??? Why

Wed Sep 27, 2017 11:20 pm

I had this issue with port 1 of my MikroTik Powerbox. Try lowering the MTU. That was the only resolution I found.
 
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TomjNorthIdaho
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Re: Link down link up speed 10 ??? Why

Thu Sep 28, 2017 1:50 am

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why?
Check your Ethernet cable on ether4
If you have an Ethernet cable tester , then test it
If you have a crimping tool, cut off both ends and make new ends.
How long is the Ethernet cable ?
Make sure both sides are set for auto auto
 
djfrancis
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Re: Link down link up speed 10 ??? Why

Thu Sep 28, 2017 12:03 pm

Code: Select all

why?
Check your Ethernet cable on ether4
If you have an Ethernet cable tester , then test it
If you have a crimping tool, cut off both ends and make new ends.
How long is the Ethernet cable ?
Make sure both sides are set for auto auto
You are right, when ethernet goes down and up all time the problem may be:
1.- Bad connectors (make them again)
2.- Bad Cable (replace them)
3.- Distance of cable (max recommended for PoE is about 70-90 meters)
4.- Ethernet interface damaged on external/internal unit

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fatray747
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Re: Link down link up speed 10 ??? Why

Sat Aug 04, 2018 4:53 am

I had this problem before.
RB850G connected with two ADSL modems and one AP.
The whole network was not steady, ADSLs disconnect randomly, WiFi lost connection.
After checked the log, I found a lot of link-down and link-up, the interface will be suddenly dropped to 100M and then back to 1G but after some time it will go back to 100M.

I replaced all the cheapy thin flat LAN cables with a branded patch cords.
All problem solved.

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