Port repeatedly goes down and back up

Installing and Using OpenWrt
1

hey I'm having problems with openwrt, my pc loses connection often, dhcp lease is fine

it doesn't happen in fixed intervals, but it fills the kernel log

[489740.566163] mtk_soc_eth 1e100000.ethernet eth0: port 4 link down
[489743.408066] mtk_soc_eth 1e100000.ethernet eth0: port 4 link up
[489994.161957] mtk_soc_eth 1e100000.ethernet eth0: port 4 link down
[489997.042153] mtk_soc_eth 1e100000.ethernet eth0: port 4 link up
[491171.894563] mtk_soc_eth 1e100000.ethernet eth0: port 4 link down
[491174.782095] mtk_soc_eth 1e100000.ethernet eth0: port 4 link up
[496688.339184] mtk_soc_eth 1e100000.ethernet eth0: port 4 link down
[496691.306971] mtk_soc_eth 1e100000.ethernet eth0: port 4 link up
[496752.027966] mtk_soc_eth 1e100000.ethernet eth0: port 4 link down
[496754.920652] mtk_soc_eth 1e100000.ethernet eth0: port 4 link up

router: D-Link DIR-860L B1
firmware: LEDE Reboot 17.01.4 r3560-79f57e422d

I installed unbound, but it also happened before with dnsmasq

2

What happens when you plug your PC into another port?

3

Or when you use a different cable?

2 Likes
4

I will try and report back

5

same thing, tried a different port and a different cable

6

could be a bad NIC in the PC. Does the connection settings in the OS show the connection going Enabled/Disabled?

7

it shows it as disconnected and reconnected

8

Have you tried:

  • another port of the router?
  • another network cable?

If the first two troubleshooting tasks don't solve the issue, it could be the NIC.

9

did you read my reply?

10

Aaah, my apologies, it was only a few minutes before @davidc502.

  • If you manually set the interface speed to 100 Mbps, does it stay connected?
  • Is either cable tested longer than 100 meters?
11

it's 2m max, pc is right next to the router, I can try 100mbps

12

Try plugging into a dumb switch, does pc still say connected and disconnected? If so it's the nic or nic driver.