Archer C80 WAN port shuts down on 1000 Mbps

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Archer C80 WAN port shuts down on 1000 Mbps

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Archer C80 WAN port shuts down on 1000 Mbps
Archer C80 WAN port shuts down on 1000 Mbps
2024-01-08 16:50:28 - last edited 2024-01-31 08:08:53
Model: Archer C80  
Hardware Version: V1
Firmware Version: 1.13.2 Build 230824 Rel.74702n(4555)

Hi all,

 

I have a 500/50 connection. Directly from my modem I get full speed without issues.
My Archer C80 shuts the WAN port down as soon as I set its negotiation speed to 1000 Mbps. Auto negotiaton goes to 10 Mbps full duplex. I can force it to 100 Mbps full duplex, but I have to reboot the router to make that one work. Even after the reboot I first have to disconnect and reconnect the ethernet cable.
The device is in router mode and I intend to keep it that way.


I've tried so far:
- power cycling the router and modem quite a few times (power off both, first start the router, then the modem when it's running, but I've tried it the other way around as well)
- 4 different CAT 5e cables and 2 different CAT 6a cables
- factory reset
- disabling NAT boost, enabling QoS, limiting the bandwith to 999/999 and various other values
- disabling NAT completely
- turning IPv6 on and off
- cleaning the WAN port with air and a soft brush

 

When I powered up the router it was on an older fw version, I didn't check which one, but I only updated later. So I guess fw issue can also be ruled out.

 

In the network map the WAN port sometimes lights up and shows 1000 Mbps Full Duplex for a few seconds, but then it turns grey again. During these short periods I still get no connection and the light on the output port of my modem doesn't light up either.


WiFi speeds are the same as cable speeds by the way.


I guess the router is faulty? I'm out of warranty as it's 3 years old. I have used it in the past the same modem at a different address, and it worked perfectly fine. But I wasn't using it in the last 2 years. 

 

Many thanks for your help in advance!

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#1
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1 Accepted Solution
Re:Archer C80 WAN port shuts down on 1000 Mbps-Solution
2024-01-12 18:20:51 - last edited 2024-01-31 08:08:53
I've bought an Archer C6 as a replacement as it was on sale, that one works perfectly, I get full speed. It was indeed a faulty WAN port.
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Re:Archer C80 WAN port shuts down on 1000 Mbps
2024-01-09 03:06:36

  @vxpeter 

 

You could connect a gigabit computer to WAN port of Archer C80 and check if it works when set its negotiation speed to 1000 Mbps, if so, it might be some compatibility issue with your modem, if it has the same issue, it might be the WAN port faulty.

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#2
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Re:Archer C80 WAN port shuts down on 1000 Mbps
2024-01-09 18:49:28 - last edited 2024-01-09 18:49:52

Thank you, I've done so, same story, WAN port shuts down as soon as I force 1000 Mbps. 100 Mbps works fine. I guess the router really is faulty then.

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Re:Archer C80 WAN port shuts down on 1000 Mbps
2024-01-10 06:36:47

  @vxpeter 

 

Contact your local tech support with the issue details - here.

If this was helpful click once on the arrow pointing upward. If this solves your issue, click once the star to mark it as a "Recommended Solution".
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#4
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Re:Archer C80 WAN port shuts down on 1000 Mbps-Solution
2024-01-12 18:20:51 - last edited 2024-01-31 08:08:53
I've bought an Archer C6 as a replacement as it was on sale, that one works perfectly, I get full speed. It was indeed a faulty WAN port.
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#5
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