Nanopi R3S random eth0 reset

markus2001 · October 9, 2025, 8:37pm

I experience random crashes of my wan interface (every 6 to 8 hours)

Thu Oct  9 19:31:46 2025 daemon.notice netifd: Network device 'eth0' link is up
Thu Oct  9 19:31:46 2025 daemon.notice netifd: Interface 'wan' has link connectivity
Thu Oct  9 19:31:46 2025 daemon.notice netifd: Interface 'wan' is setting up now
Thu Oct  9 19:31:46 2025 kern.info kernel: [   81.452830] rk_gmac-dwmac fe010000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
Thu Oct  9 19:31:46 2025 daemon.notice netifd: wan (4106): udhcpc: started, v1.36.1
Thu Oct  9 19:31:46 2025 daemon.notice netifd: wan (4106): udhcpc: broadcasting discover
Thu Oct  9 19:31:48 2025 daemon.notice netifd: Network device 'eth0' link is down
Thu Oct  9 19:31:48 2025 daemon.notice netifd: Interface 'wan' has link connectivity loss
Thu Oct  9 19:31:48 2025 kern.info kernel: [   82.976501] rk_gmac-dwmac fe010000.ethernet eth0: Link is Down

I changed the power supply, disabled autoneg in ethtool, disabled TCP Segmentation Offloading and Generic Segmentation Offloading - without success.
The interface comes up again, no reboot required.

OpenWrt 24.10.3

root@OpenWrt:~# ethtool -I eth0
driver: st_gmac
version: 6.6.104
firmware-version:
expansion-rom-version:
bus-info: fe010000.ethernet
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: yes
supports-priv-flags: no

Any help or ideas appreciated
Thanks

brada4 · October 9, 2025, 9:30pm

ethtool wan
ethtool --show-eee wan
ethtool -a wan
mii-tool -v wan

markus2001 · October 10, 2025, 6:07am

root@OpenWrt:~# ethtool eth0
Settings for eth0:
	Supported ports: [ TP	 MII ]
	Supported link modes:   10baseT/Half 10baseT/Full
	                        100baseT/Half 100baseT/Full
	                        1000baseT/Full
	Supported pause frame use: Symmetric Receive-only
	Supports auto-negotiation: Yes
	Supported FEC modes: Not reported
	Advertised link modes:  10baseT/Half 10baseT/Full
	                        100baseT/Half 100baseT/Full
	                        1000baseT/Full
	Advertised pause frame use: Symmetric Receive-only
	Advertised auto-negotiation: Yes
	Advertised FEC modes: Not reported
	Link partner advertised link modes:  10baseT/Half 10baseT/Full
	                                     100baseT/Half 100baseT/Full
	                                     1000baseT/Half 1000baseT/Full
	Link partner advertised pause frame use: Symmetric Receive-only
	Link partner advertised auto-negotiation: Yes
	Link partner advertised FEC modes: Not reported
	Speed: 1000Mb/s
	Duplex: Full
	Auto-negotiation: on
	master-slave cfg: preferred slave
	master-slave status: slave
	Port: Twisted Pair
	PHYAD: 1
	Transceiver: external
	MDI-X: Unknown
	Supports Wake-on: ug
	Wake-on: d
        Current message level: 0x0000003f (63)
                               drv probe link timer ifdown ifup
	Link detected: yes

root@OpenWrt:~# ethtool --show-eee eth0
EEE settings for eth0:
	EEE status: enabled - active
	Tx LPI: 1000000 (us)
	Supported EEE link modes:  100baseT/Full
	                           1000baseT/Full
	Advertised EEE link modes:  100baseT/Full
	                            1000baseT/Full
	Link partner advertised EEE link modes:  100baseT/Full
	                                         1000baseT/Full

root@OpenWrt:~# ethtool -a eth0
Pause parameters for eth0:
Autonegotiate:	on
RX:		off
TX:		off
RX negotiated: on
TX negotiated: on

root@OpenWrt:~# mii-tool -v eth0
eth0: negotiated 1000baseT-FD flow-control, link ok
  product info: vendor 00:07:32, model 17 rev 6
  basic mode:   autonegotiation enabled
  basic status: autonegotiation complete, link ok
  capabilities: 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
  advertising:  1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control
  link partner: 1000baseT-HD 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control

brada4 · October 10, 2025, 6:26am

You can try disabling eee and pauses

ethtool --set-eee wan eee off tx-lpi off
ethtool -r wan
ethtool -A wan tx off rx off autoneg on
ethtool -r wan

Another would be to fix precise link mode (read ethtool manual page for -s advertise 0x…..)

markus2001 · October 11, 2025, 6:08pm

Unfortunately, the issue’s still there. Is there any other way to debug it?
I’ll try rolling back to 23.05 to see if it’s related to the newer kernel.

lleachii · October 11, 2025, 6:45pm

Your log begins with the interface coming up and going down in 2 one-hundredths of a second. That's all. The logs before and after were just as important.

How long is this crash?
Do you get the same IP or a different one?
What is the lease time on your WAN interface (the remaining time on the Overview Page is OK)?

markus2001 · October 16, 2025, 5:12pm

I investigated for a couple more days and found that the issue occurs when there’s heavier network activity (P2P traffic). During that time, the conntrack table has around 2–3k entries. I wasn’t able to reproduce the problem when P2P traffic was disabled, with only about 300–500 conntrack entries.

The WAN interface lease time is 24 hours, and I’m getting the same IP address again after renewal. The interface crash doesn’t seem to be related to the lease timing.

Thu Oct 16 10:11:37 2025 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.1.114 fe:9a:bc:0e:6e:4a
Thu Oct 16 10:20:36 2025 kern.info kernel: [236848.864336] rk_gmac-dwmac fe010000.ethernet eth0: Link is Down
Thu Oct 16 10:20:36 2025 daemon.notice netifd: Network device 'eth0' link is down
Thu Oct 16 10:20:36 2025 daemon.notice netifd: Interface 'wan' has link connectivity loss
Thu Oct 16 10:20:36 2025 daemon.notice netifd: wan (13403): udhcpc: received SIGTERM
Thu Oct 16 10:20:36 2025 daemon.notice netifd: wan (13403): udhcpc: unicasting a release of xx.xx.xx.xx to xx.xx.xx.xx
Thu Oct 16 10:20:36 2025 daemon.notice netifd: wan (13403): udhcpc: sending release
Thu Oct 16 10:20:36 2025 daemon.notice netifd: wan (13403): udhcpc: entering released state
Thu Oct 16 10:20:36 2025 daemon.notice netifd: wan (13403): Command failed: ubus call network.interface notify_proto { "action": 0, "link-up": false, "keep": false, "interface": "wan" } (Permission denied)
Thu Oct 16 10:20:36 2025 daemon.notice netifd: Interface 'wan' is now down
Thu Oct 16 10:21:06 2025 daemon.notice netifd: Network device 'eth0' link is up
Thu Oct 16 10:21:06 2025 daemon.notice netifd: Interface 'wan' has link connectivity
Thu Oct 16 10:21:06 2025 daemon.notice netifd: Interface 'wan' is setting up now
Thu Oct 16 10:21:06 2025 kern.info kernel: [236878.544749] rk_gmac-dwmac fe010000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off
Thu Oct 16 10:21:06 2025 daemon.notice netifd: wan (15683): udhcpc: started, v1.36.1
Thu Oct 16 10:21:06 2025 daemon.notice netifd: wan (15683): udhcpc: broadcasting discover
Thu Oct 16 10:21:08 2025 kern.info kernel: [236880.331743] rk_gmac-dwmac fe010000.ethernet eth0: Link is Down
Thu Oct 16 10:21:08 2025 daemon.notice netifd: Network device 'eth0' link is down
Thu Oct 16 10:21:08 2025 daemon.notice netifd: Interface 'wan' has link connectivity loss
Thu Oct 16 10:21:08 2025 daemon.notice netifd: wan (15683): udhcpc: received SIGTERM
Thu Oct 16 10:21:08 2025 daemon.notice netifd: wan (15683): udhcpc: entering released state
Thu Oct 16 10:21:08 2025 daemon.notice netifd: wan (15683): Command failed: ubus call network.interface notify_proto { "action": 0, "link-up": false, "keep": false, "interface": "wan" } (Permission denied)
Thu Oct 16 10:21:08 2025 daemon.notice netifd: Interface 'wan' is now down
Thu Oct 16 10:22:22 2025 daemon.notice netifd: Network device 'eth0' link is up
Thu Oct 16 10:22:22 2025 daemon.notice netifd: Interface 'wan' has link connectivity
Thu Oct 16 10:22:22 2025 daemon.notice netifd: Interface 'wan' is setting up now
Thu Oct 16 10:22:22 2025 kern.info kernel: [236954.405747] rk_gmac-dwmac fe010000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
Thu Oct 16 10:22:22 2025 daemon.notice netifd: wan (15788): udhcpc: started, v1.36.1
Thu Oct 16 10:22:22 2025 daemon.notice netifd: wan (15788): udhcpc: broadcasting discover
Thu Oct 16 10:22:23 2025 kern.info kernel: [236955.897638] rk_gmac-dwmac fe010000.ethernet eth0: Link is Down
Thu Oct 16 10:22:23 2025 daemon.notice netifd: Network device 'eth0' link is down
Thu Oct 16 10:22:23 2025 daemon.notice netifd: Interface 'wan' has link connectivity loss
Thu Oct 16 10:22:23 2025 daemon.notice netifd: wan (15788): udhcpc: received SIGTERM
Thu Oct 16 10:22:23 2025 daemon.notice netifd: wan (15788): udhcpc: entering released state
Thu Oct 16 10:22:23 2025 daemon.notice netifd: wan (15788): Command failed: ubus call network.interface notify_proto { "action": 0, "link-up": false, "keep": false, "interface": "wan" } (Permission denied)
Thu Oct 16 10:22:23 2025 daemon.notice netifd: Interface 'wan' is now down
Thu Oct 16 10:22:30 2025 daemon.notice netifd: Network device 'eth0' link is up
Thu Oct 16 10:22:30 2025 daemon.notice netifd: Interface 'wan' has link connectivity
Thu Oct 16 10:22:30 2025 daemon.notice netifd: Interface 'wan' is setting up now
Thu Oct 16 10:22:30 2025 kern.info kernel: [236962.356566] rk_gmac-dwmac fe010000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
Thu Oct 16 10:22:30 2025 daemon.notice netifd: wan (15892): udhcpc: started, v1.36.1
Thu Oct 16 10:22:30 2025 daemon.notice netifd: wan (15892): udhcpc: broadcasting discover
Thu Oct 16 10:22:33 2025 daemon.notice netifd: wan (15892): udhcpc: broadcasting discover
Thu Oct 16 10:22:36 2025 daemon.notice netifd: wan (15892): udhcpc: broadcasting discover
Thu Oct 16 10:23:01 2025 daemon.notice netifd: wan (15892): udhcpc: broadcasting select for xx.xx.xx.xx, server xx.xx.xx.xx
Thu Oct 16 10:23:01 2025 daemon.notice netifd: wan (15892): udhcpc: lease of xx.xx.xx.xx obtained from xx.xx.xx.xx, lease time 86400
Thu Oct 16 10:23:01 2025 daemon.notice netifd: Interface 'wan' is now up
Thu Oct 16 10:23:05 2025 user.notice firewall: Reloading firewall due to ifup of wan (eth0)
Thu Oct 16 10:23:06 2025 user.notice nlbwmon: Reloading nlbwmon due to ifup of wan (eth0)