Internet disconnects in intervals

Installing and Using OpenWrt
1

I am very new on OpenWRT, this may very well be something silly. :slight_smile:

Today I connected my Raspberry Pi Compute Module 4 IoT Router Carrier Board Mini (https://www.dfrobot.com/product-2242.html). WAN is connected to a modem my ISP supplies and LAN is connected to a HP switch.

Every now and then the internet connection is dropped. Facebook complains, Youtube sometimes stops, websites won't load and so on.

Logs says this:

[30933.733807] bcmgenet fd580000.ethernet eth0: Link is Down
[30963.430406] bcmgenet fd580000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[32816.906762] bcmgenet fd580000.ethernet eth0: Link is Down
[32845.579397] bcmgenet fd580000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[34879.284097] bcmgenet fd580000.ethernet eth0: Link is Down
[34907.956622] bcmgenet fd580000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx

Thu Apr  7 21:25:11 2022 daemon.notice netifd: Network device 'eth0' link is down
Thu Apr  7 21:25:11 2022 daemon.notice netifd: Interface 'wan' has link connectivity loss
Thu Apr  7 21:25:11 2022 kern.info kernel: [34879.284097] bcmgenet fd580000.ethernet eth0: Link is Down
Thu Apr  7 21:25:39 2022 daemon.notice netifd: Network device 'eth0' link is up
Thu Apr  7 21:25:39 2022 daemon.notice netifd: Interface 'wan' has link connectivity
Thu Apr  7 21:25:39 2022 kern.info kernel: [34907.956622] bcmgenet fd580000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx

Any help is very much appreciated.

2

The first check would be the cable between modem and drfobot base board.

Another debugging step could involve putting a simple unmanaged switch between modem and dfrobot base board (to rule out interoperability issues between dfrobot and modem).

--
Disclaimer: this is just generic debugging advice, I have no personal experience with the RPi ecosystem or the dfrobot board in particular and probably can't help beyond this.

2 Likes
3

Thanks! I have changed the cable and changed the port on the built in switch in the modem.
At the moment I don't have access to an unmanaged switch.

So far no noticable disconnects for an hour. I'll keep it this way for some time and get back to you.

4

What twists it has been. :slight_smile:

I would call this solved. It's a heating issue.
My network equipment is placed in a cupboard. I thought it was ventilated enough.

When I opened it to change cable, the cooler air stabilised the router. During the last two days there has only been issues when someone accidentally closed the door.

Now I have to find a way to ventilate the cupboard. :smiley:

5

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