Orange Pi 4 regularly loses outbound network after a few days

Hi all,

After a restart and after a few days go by my My Orange Pi 4 LTS randomly loses its ability to make outbound network connections.

I can ssh into the box, however for some reason the routing tables are empty:

> ping 192.168.1.53
ping: connect: Network is unreachable


> netstat -r
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface

The box is connected through an ethernet cable, configured to used DHCP, but I see no IPv4 address in the interface configuration:

> ifconfig

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet6 2a01:cb15:81c2:e500:6cba:b008:2761:e29a  prefixlen 64  scopeid 0x0<global>
        inet6 2a01:cb15:81c2:e500:e971:fd8d:4d26:e65  prefixlen 64  scopeid 0x0<global>
        inet6 fe80::9935:bbd1:a503:c83a  prefixlen 64  scopeid 0x20<link>
        inet6 2a01:cb15:81c2:e500:681d:5fa0:94fd:9e1a  prefixlen 64  scopeid 0x0<global>
        ether 72:d7:a6:97:4b:cf  txqueuelen 1000  (Ethernet)
        RX packets 195548  bytes 16128189 (16.1 MB)
        RX errors 0  dropped 13442  overruns 0  frame 0
        TX packets 22932  bytes 2779612 (2.7 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 31

I am new to armbian, and not sure where to go to troubleshoot from there. /etc/networks/interfaces is empty, how is eth0 configured?

I can resolve the issue by issuing

> sudo ip link eth0 down && sudo ip link eth0 up

... and I have added a cron entry doing just that, but obviously I would like to understand where the issue is coming from.

Here is some system information:

No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 22.04.1 LTS
Release: 22.04
Codename: jammy

Linux orangepi4-lts 5.15.76-rockchip64 #22.08.8 SMP PREEMPT Sun Oct 30 10:57:32 CET 2022 aarch64 aarch64 aarch64 GNU/Linux

Thanks!

Franck

EDIT: here is what I find in journalctl, it looks like the eth0 interface goes down shortly (4mn) after a reboot and never comes back up correctly:

Apr 17 06:17:28 orangepi4-lts NetworkManager[1626]: <info>  [1681705048.7753] dhcp4 (eth0): state changed new lease, address=192.168.0.102
<normal network manager startup>
Apr 17 06:17:28 orangepi4-lts NetworkManager[1626]: <info>  [1681705048.8306] device (eth0): Activation: successful, device activated.
...
Apr 17 06:17:29 orangepi4-lts nm-dispatcher[2142]: /etc/network/if-up.d/resolved: 12: mystatedir: not found
Apr 17 06:17:32 orangepi4-lts kernel: rk_gmac-dwmac fe300000.ethernet eth0: Link is Down
Apr 17 06:17:32 orangepi4-lts systemd[1]: systemd-fsckd.service: Deactivated successfully.
Apr 17 06:17:36 orangepi4-lts NetworkManager[1626]: <info>  [1681705056.3960] device (eth0): carrier: link connected
Apr 17 06:17:36 orangepi4-lts kernel: rk_gmac-dwmac fe300000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off
Apr 17 06:17:36 orangepi4-lts NetworkManager[1626]: <info>  [1681705056.3968] device (eth0): ip:dhcp4: restarting
Apr 17 06:17:36 orangepi4-lts NetworkManager[1626]: <info>  [1681705056.4136] dhcp4 (eth0): canceled DHCP transaction
Apr 17 06:17:36 orangepi4-lts NetworkManager[1626]: <info>  [1681705056.4138] dhcp4 (eth0): activation: beginning transaction (timeout in 45 seconds)
Apr 17 06:17:36 orangepi4-lts NetworkManager[1626]: <info>  [1681705056.4139] dhcp4 (eth0): state changed no lease
Apr 17 06:17:36 orangepi4-lts NetworkManager[1626]: <info>  [1681705056.4144] dhcp4 (eth0): activation: beginning transaction (timeout in 45 seconds)
Apr 17 06:17:36 orangepi4-lts NetworkManager[1626]: <info>  [1681705056.4305] dhcp4 (eth0): state changed new lease, address=192.168.0.102

<from this point on, outbound connections are failing, e.g.
      Apr 17 06:17:38 orangepi4-lts telegraf[1790]: 2023-04-17T04:17:38Z E! [agent] Error writing to outputs.influxdb_v2: failed to send metrics to any configured server(s)
>
  
Apr 17 06:17:42 orangepi4-lts systemd[1]: systemd-hostnamed.service: Deactivated successfully.
Apr 17 06:17:46 orangepi4-lts systemd[1]: NetworkManager-dispatcher.service: Deactivated successfully.
Apr 17 06:18:28 orangepi4-lts NetworkManager[1626]: <info>  [1681705108.9445] dhcp4 (eth0): activation: beginning transaction (timeout in 45 seconds)
Apr 17 06:18:28 orangepi4-lts NetworkManager[1626]: <info>  [1681705108.9446] dhcp4 (eth0): state changed no lease
Apr 17 06:18:58 orangepi4-lts systemd-resolved[794]: eth0: Bus client set search domain list to: home
Apr 17 06:18:58 orangepi4-lts systemd-resolved[794]: eth0: Bus client set DNS server list to: 192.168.0.254, 2a01:cb15:81c2:e500:7ec1:77ff:fe90:48f0
Apr 17 06:18:58 orangepi4-lts systemd[1]: Starting resolvconf-pull-resolved.service...
Apr 17 06:18:58 orangepi4-lts sh[2217]: /etc/resolvconf/update.d/libc: Warning: /etc/resolv.conf is not a symbolic link to /run/resolvconf/resolv.conf
Apr 17 06:19:14 orangepi4-lts systemd-resolved[794]: eth0: Bus client set DNS server list to: 2a01:cb15:81c2:e500:7ec1:77ff:fe90:48f0

Edited April 19, 20233 yr by franck102