Hi,
since tow months I have a FTTH connection and I use an OpenWRT one. And since then I have a nasty problem.
The wan eth0 interface goes periodically up and down, restarts and reconnects to the ISP and gets a new address. It does this infinitely every 5-10s. Until either the ISP kicks it out or the system itself stops.
I tried switching off EEE, sometimes it works mostly not. Found something regarding a race condition tried the solution, did not work in my case.
I started fumbling around with the parameters of the interface, that sometimes kicks it out of this loop and then the internet connection works quite well. Until the system restarts. Then again infinite loop.
Firmware is this: OpenWrt 25.12.3 r32912-6639b15f62 / LuCI openwrt-25.12 branch 26.129.70992~61fbfe6
But i tried this with several older versions over the last few weeks.
I am a bit out of ideas now and would need some help. Thanks a lot!
Typical log looks like this:
[May 11, 2026, 7:42:20 PM UTC] daemon.notice: netifd: Interface 'wan' is now down
[May 11, 2026, 7:42:20 PM UTC] daemon.err: procd: instance myddns_ipv4 not found
[May 11, 2026, 7:42:20 PM UTC] daemon.notice: netifd: Interface 'wan' is setting up now
[May 11, 2026, 7:42:21 PM UTC] daemon.info: pppd[20965]: Plugin pppoe.so loaded.
[May 11, 2026, 7:42:21 PM UTC] daemon.info: pppd[20965]: PPPoE plugin from pppd 2.5.2
[May 11, 2026, 7:42:21 PM UTC] daemon.notice: pppd[20965]: pppd 2.5.2 started by root, uid 0
[May 11, 2026, 7:42:21 PM UTC] daemon.info: pppd[20965]: PPP session is 1281
[May 11, 2026, 7:42:21 PM UTC] daemon.warn: pppd[20965]: Connected to 70:7D:B9:7D:9C:3F via interface eth0
[May 11, 2026, 7:42:21 PM UTC] daemon.info: pppd[20965]: Using interface pppoe-wan
[May 11, 2026, 7:42:21 PM UTC] daemon.notice: pppd[20965]: Connect: pppoe-wan <--> eth0
[May 11, 2026, 7:42:21 PM UTC] daemon.notice: pppd[20965]: PAP authentication succeeded
[May 11, 2026, 7:42:21 PM UTC] daemon.notice: pppd[20965]: peer from calling number 70:7D:B9:7D:9C:3F authorized
[May 11, 2026, 7:42:21 PM UTC] daemon.notice: pppd[20965]: local LL address fe80::d29e:ef57:aec8:187e
[May 11, 2026, 7:42:21 PM UTC] daemon.notice: pppd[20965]: remote LL address fe80::727d:b9ff:fe7d:9c00
[May 11, 2026, 7:42:21 PM UTC] daemon.notice: pppd[20965]: local IP address 100.120.113.54
[May 11, 2026, 7:42:21 PM UTC] daemon.notice: pppd[20965]: remote IP address 185.155.188.251
[May 11, 2026, 7:42:21 PM UTC] daemon.notice: pppd[20965]: primary DNS address 185.155.188.55
[May 11, 2026, 7:42:21 PM UTC] daemon.notice: pppd[20965]: secondary DNS address 185.155.191.247
[May 11, 2026, 7:42:21 PM UTC] daemon.notice: netifd: Network device 'pppoe-wan' link is up
[May 11, 2026, 7:42:21 PM UTC] daemon.notice: netifd: Network alias 'pppoe-wan' link is up
[May 11, 2026, 7:42:21 PM UTC] daemon.notice: netifd: Interface 'wan' is now up
[May 11, 2026, 7:42:21 PM UTC] daemon.info: dnsmasq[1]: reading /tmp/resolv.conf.d/resolv.conf.auto
[May 11, 2026, 7:42:21 PM UTC] daemon.info: dnsmasq[1]: using nameserver 192.168.100.1#53
[May 11, 2026, 7:42:21 PM UTC] daemon.info: dnsmasq[1]: using nameserver 185.155.188.55#53
[May 11, 2026, 7:42:21 PM UTC] daemon.info: dnsmasq[1]: using nameserver 185.155.191.247#53
[May 11, 2026, 7:42:21 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for test
[May 11, 2026, 7:42:21 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for onion
[May 11, 2026, 7:42:21 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for localhost
[May 11, 2026, 7:42:21 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for local
[May 11, 2026, 7:42:21 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for invalid
[May 11, 2026, 7:42:21 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for bind
[May 11, 2026, 7:42:21 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for lan
[May 11, 2026, 7:42:21 PM UTC] daemon.notice: netifd: Interface 'wan_6' is enabled
[May 11, 2026, 7:42:21 PM UTC] daemon.notice: netifd: Interface 'wan_6' has link connectivity
[May 11, 2026, 7:42:21 PM UTC] daemon.notice: netifd: Interface 'wan_6' is setting up now
[May 11, 2026, 7:42:21 PM UTC] user.notice: firewall: Reloading firewall due to ifup of wan (pppoe-wan)
[May 11, 2026, 7:42:21 PM UTC] daemon.notice: netifd: Interface 'wan_6' is now up
[May 11, 2026, 7:42:22 PM UTC] user.notice: firewall: Reloading firewall due to ifupdate of wan (pppoe-wan)
[May 11, 2026, 7:42:22 PM UTC] user.notice: firewall: Reloading firewall due to ifup of wan_6 (pppoe-wan)
[May 11, 2026, 7:42:27 PM UTC] kern.info: [ 3994.091382] mtk_soc_eth 15100000.ethernet eth0: Link is Down
[May 11, 2026, 7:42:27 PM UTC] daemon.notice: netifd: Network device 'eth0' link is down
[May 11, 2026, 7:42:27 PM UTC] daemon.notice: netifd: Interface 'wan' has link connectivity loss
[May 11, 2026, 7:42:27 PM UTC] daemon.info: pppd[20965]: Terminating on signal 15
[May 11, 2026, 7:42:27 PM UTC] daemon.info: pppd[20965]: Connect time 0.2 minutes.
[May 11, 2026, 7:42:27 PM UTC] daemon.info: pppd[20965]: Sent 14564 bytes, received 8990 bytes.
[May 11, 2026, 7:42:28 PM UTC] daemon.notice: netifd: Interface 'wan_6' is disabled
[May 11, 2026, 7:42:28 PM UTC] daemon.notice: netifd: Network device 'pppoe-wan' link is down
[May 11, 2026, 7:42:28 PM UTC] daemon.notice: netifd: Network alias 'pppoe-wan' link is down
[May 11, 2026, 7:42:28 PM UTC] daemon.notice: netifd: Interface 'wan_6' has link connectivity loss
[May 11, 2026, 7:42:28 PM UTC] daemon.notice: netifd: wan_6 (21039): Failed to send RS (Network unreachable)
[May 11, 2026, 7:42:28 PM UTC] daemon.notice: netifd: wan_6 (21039): Failed to send RELEASE message to ff02::1:2 (Network unreachable)
[May 11, 2026, 7:42:28 PM UTC] daemon.notice: netifd: wan_6 (21039): Command failed: ubus call network.interface notify_proto { "action": 0, "link-up": false, "keep": false, "interface": "wan_6" } (Permission denied)
[May 11, 2026, 7:42:28 PM UTC] daemon.notice: netifd: Interface 'wan_6' is now down
[May 11, 2026, 7:42:28 PM UTC] daemon.info: dnsmasq[1]: reading /tmp/resolv.conf.d/resolv.conf.auto
[May 11, 2026, 7:42:28 PM UTC] daemon.info: dnsmasq[1]: using nameserver 192.168.100.1#53
[May 11, 2026, 7:42:28 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for test
[May 11, 2026, 7:42:28 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for onion
[May 11, 2026, 7:42:28 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for localhost
[May 11, 2026, 7:42:28 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for local
[May 11, 2026, 7:42:28 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for invalid
[May 11, 2026, 7:42:28 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for bind
[May 11, 2026, 7:42:28 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for lan
[May 11, 2026, 7:42:28 PM UTC] daemon.warn: odhcpd[1951]: No default route present, setting ra_lifetime to 0!
[May 11, 2026, 7:42:31 PM UTC] daemon.notice: netifd: Network device 'eth0' link is up
[May 11, 2026, 7:42:31 PM UTC] daemon.notice: netifd: Interface 'wan' has link connectivity
[May 11, 2026, 7:42:31 PM UTC] kern.info: [ 3997.279279] mtk_soc_eth 15100000.ethernet eth0: Link is Up - 2.5Gbps/Full - flow control rx/tx
[May 11, 2026, 7:42:32 PM UTC] daemon.notice: netifd: Interface 'wan' is now down
[May 11, 2026, 7:42:33 PM UTC] daemon.err: procd: instance myddns_ipv4 not found
[May 11, 2026, 7:42:33 PM UTC] daemon.notice: netifd: Interface 'wan' is setting up now
[May 11, 2026, 7:42:33 PM UTC] daemon.info: pppd[21484]: Plugin pppoe.so loaded.
[May 11, 2026, 7:42:33 PM UTC] daemon.info: pppd[21484]: PPPoE plugin from pppd 2.5.2
[May 11, 2026, 7:42:33 PM UTC] daemon.notice: pppd[21484]: pppd 2.5.2 started by root, uid 0
[May 11, 2026, 7:42:33 PM UTC] daemon.info: pppd[21484]: PPP session is 1282
[May 11, 2026, 7:42:33 PM UTC] daemon.warn: pppd[21484]: Connected to 70:7D:B9:7D:9C:3F via interface eth0
[May 11, 2026, 7:42:33 PM UTC] daemon.info: pppd[21484]: Using interface pppoe-wan
[May 11, 2026, 7:42:33 PM UTC] daemon.notice: pppd[21484]: Connect: pppoe-wan <--> eth0
[May 11, 2026, 7:42:33 PM UTC] daemon.notice: pppd[21484]: PAP authentication succeeded
[May 11, 2026, 7:42:33 PM UTC] daemon.notice: pppd[21484]: peer from calling number 70:7D:B9:7D:9C:3F authorized
[May 11, 2026, 7:42:33 PM UTC] daemon.notice: pppd[21484]: local LL address fe80::d29e:ef57:aec8:187e
[May 11, 2026, 7:42:33 PM UTC] daemon.notice: pppd[21484]: remote LL address fe80::727d:b9ff:fe7d:9c00
[May 11, 2026, 7:42:33 PM UTC] daemon.notice: pppd[21484]: local IP address 100.120.112.67
[May 11, 2026, 7:42:33 PM UTC] daemon.notice: pppd[21484]: remote IP address 185.155.188.251
[May 11, 2026, 7:42:33 PM UTC] daemon.notice: pppd[21484]: primary DNS address 185.155.188.55
[May 11, 2026, 7:42:33 PM UTC] daemon.notice: pppd[21484]: secondary DNS address 185.155.191.247
[May 11, 2026, 7:42:33 PM UTC] daemon.notice: netifd: Network device 'pppoe-wan' link is up
[May 11, 2026, 7:42:33 PM UTC] daemon.notice: netifd: Network alias 'pppoe-wan' link is up
[May 11, 2026, 7:42:33 PM UTC] daemon.notice: netifd: Interface 'wan' is now up
[May 11, 2026, 7:42:33 PM UTC] daemon.info: dnsmasq[1]: reading /tmp/resolv.conf.d/resolv.conf.auto
[May 11, 2026, 7:42:33 PM UTC] daemon.info: dnsmasq[1]: using nameserver 192.168.100.1#53
[May 11, 2026, 7:42:33 PM UTC] daemon.info: dnsmasq[1]: using nameserver 185.155.188.55#53
[May 11, 2026, 7:42:33 PM UTC] daemon.info: dnsmasq[1]: using nameserver 185.155.191.247#53
[May 11, 2026, 7:42:33 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for test
[May 11, 2026, 7:42:33 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for onion
[May 11, 2026, 7:42:33 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for localhost
[May 11, 2026, 7:42:33 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for local
[May 11, 2026, 7:42:33 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for invalid
[May 11, 2026, 7:42:33 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for bind
[May 11, 2026, 7:42:33 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for lan
[May 11, 2026, 7:42:33 PM UTC] daemon.notice: netifd: Interface 'wan_6' is enabled
[May 11, 2026, 7:42:33 PM UTC] daemon.notice: netifd: Interface 'wan_6' has link connectivity
[May 11, 2026, 7:42:33 PM UTC] daemon.notice: netifd: Interface 'wan_6' is setting up now
[May 11, 2026, 7:42:33 PM UTC] user.notice: firewall: Reloading firewall due to ifup of wan (pppoe-wan)
[May 11, 2026, 7:42:33 PM UTC] daemon.notice: netifd: Interface 'wan_6' is now up
[May 11, 2026, 7:42:34 PM UTC] user.notice: firewall: Reloading firewall due to ifupdate of wan (pppoe-wan)
[May 11, 2026, 7:42:34 PM UTC] user.notice: firewall: Reloading firewall due to ifup of wan_6 (pppoe-wan)
[May 11, 2026, 7:42:40 PM UTC] daemon.notice: netifd: Network device 'eth0' link is down
[May 11, 2026, 7:42:40 PM UTC] daemon.notice: netifd: Interface 'wan' has link connectivity loss
[May 11, 2026, 7:42:40 PM UTC] kern.info: [ 4006.293757] mtk_soc_eth 15100000.ethernet eth0: Link is Down
[May 11, 2026, 7:42:40 PM UTC] daemon.info: pppd[21484]: Terminating on signal 15
[May 11, 2026, 7:42:40 PM UTC] daemon.info: pppd[21484]: Connect time 0.2 minutes.
[May 11, 2026, 7:42:40 PM UTC] daemon.info: pppd[21484]: Sent 8111 bytes, received 5849 bytes.
[May 11, 2026, 7:42:40 PM UTC] daemon.notice: netifd: Interface 'wan_6' is disabled
[May 11, 2026, 7:42:40 PM UTC] daemon.notice: netifd: Network device 'pppoe-wan' link is down
[May 11, 2026, 7:42:40 PM UTC] daemon.notice: netifd: Network alias 'pppoe-wan' link is down
[May 11, 2026, 7:42:40 PM UTC] daemon.notice: netifd: Interface 'wan_6' has link connectivity loss
[May 11, 2026, 7:42:40 PM UTC] daemon.notice: netifd: wan_6 (21558): Failed to send RS (Network unreachable)
[May 11, 2026, 7:42:40 PM UTC] daemon.notice: netifd: wan_6 (21558): Failed to send RELEASE message to ff02::1:2 (Network unreachable)
[May 11, 2026, 7:42:40 PM UTC] daemon.notice: netifd: wan_6 (21558): Command failed: ubus call network.interface notify_proto { "action": 0, "link-up": false, "keep": false, "interface": "wan_6" } (Permission denied)
[May 11, 2026, 7:42:40 PM UTC] daemon.notice: netifd: Interface 'wan_6' is now down
[May 11, 2026, 7:42:40 PM UTC] daemon.info: dnsmasq[1]: reading /tmp/resolv.conf.d/resolv.conf.auto
[May 11, 2026, 7:42:40 PM UTC] daemon.info: dnsmasq[1]: using nameserver 192.168.100.1#53
[May 11, 2026, 7:42:40 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for test
[May 11, 2026, 7:42:40 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for onion
[May 11, 2026, 7:42:40 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for localhost
[May 11, 2026, 7:42:40 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for local
[May 11, 2026, 7:42:40 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for invalid
[May 11, 2026, 7:42:40 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for bind
[May 11, 2026, 7:42:40 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for lan
[May 11, 2026, 7:42:41 PM UTC] daemon.warn: odhcpd[1951]: No default route present, setting ra_lifetime to 0!
[May 11, 2026, 7:42:43 PM UTC] daemon.notice: netifd: Network device 'eth0' link is up
[May 11, 2026, 7:42:43 PM UTC] daemon.notice: netifd: Interface 'wan' has link connectivity
[May 11, 2026, 7:42:43 PM UTC] kern.info: [ 4009.365956] mtk_soc_eth 15100000.ethernet eth0: Link is Up - 2.5Gbps/Full - flow control rx/tx
[May 11, 2026, 7:42:45 PM UTC] daemon.notice: netifd: Interface 'wan' is now down
[May 11, 2026, 7:42:45 PM UTC] daemon.err: procd: instance myddns_ipv4 not found
[May 11, 2026, 7:42:45 PM UTC] daemon.notice: netifd: Interface 'wan' is setting up now
[May 11, 2026, 7:42:45 PM UTC] daemon.info: pppd[22002]: Plugin pppoe.so loaded.
[May 11, 2026, 7:42:45 PM UTC] daemon.info: pppd[22002]: PPPoE plugin from pppd 2.5.2
[May 11, 2026, 7:42:45 PM UTC] daemon.notice: pppd[22002]: pppd 2.5.2 started by root, uid 0
[May 11, 2026, 7:42:45 PM UTC] daemon.info: pppd[22002]: PPP session is 1283
[May 11, 2026, 7:42:45 PM UTC] daemon.warn: pppd[22002]: Connected to 70:7D:B9:7D:9C:3F via interface eth0
[May 11, 2026, 7:42:45 PM UTC] daemon.info: pppd[22002]: Using interface pppoe-wan
[May 11, 2026, 7:42:45 PM UTC] daemon.notice: pppd[22002]: Connect: pppoe-wan <--> eth0
[May 11, 2026, 7:42:45 PM UTC] daemon.notice: pppd[22002]: PAP authentication succeeded
[May 11, 2026, 7:42:45 PM UTC] daemon.notice: pppd[22002]: peer from calling number 70:7D:B9:7D:9C:3F authorized
[May 11, 2026, 7:42:45 PM UTC] daemon.notice: pppd[22002]: local LL address fe80::d29e:ef57:aec8:187e
[May 11, 2026, 7:42:45 PM UTC] daemon.notice: pppd[22002]: remote LL address fe80::727d:b9ff:fe7d:9c00
[May 11, 2026, 7:42:45 PM UTC] daemon.notice: pppd[22002]: local IP address 100.120.102.180
[May 11, 2026, 7:42:45 PM UTC] daemon.notice: pppd[22002]: remote IP address 185.155.188.251
[May 11, 2026, 7:42:45 PM UTC] daemon.notice: pppd[22002]: primary DNS address 185.155.188.55
[May 11, 2026, 7:42:45 PM UTC] daemon.notice: pppd[22002]: secondary DNS address 185.155.191.247
[May 11, 2026, 7:42:45 PM UTC] daemon.notice: netifd: Network device 'pppoe-wan' link is up
[May 11, 2026, 7:42:45 PM UTC] daemon.notice: netifd: Network alias 'pppoe-wan' link is up
[May 11, 2026, 7:42:45 PM UTC] daemon.notice: netifd: Interface 'wan' is now up
[May 11, 2026, 7:42:45 PM UTC] daemon.info: dnsmasq[1]: reading /tmp/resolv.conf.d/resolv.conf.auto
[May 11, 2026, 7:42:45 PM UTC] daemon.info: dnsmasq[1]: using nameserver 192.168.100.1#53
[May 11, 2026, 7:42:45 PM UTC] daemon.info: dnsmasq[1]: using nameserver 185.155.188.55#53
[May 11, 2026, 7:42:45 PM UTC] daemon.info: dnsmasq[1]: using nameserver 185.155.191.247#53
[May 11, 2026, 7:42:45 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for test
[May 11, 2026, 7:42:45 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for onion
[May 11, 2026, 7:42:45 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for localhost
[May 11, 2026, 7:42:45 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for local
[May 11, 2026, 7:42:45 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for invalid
[May 11, 2026, 7:42:45 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for bind
[May 11, 2026, 7:42:45 PM UTC] daemon.info: dnsmasq[1]: using only locally-known addresses for lan
[May 11, 2026, 7:42:45 PM UTC] daemon.notice: netifd: Interface 'wan_6' is enabled
[May 11, 2026, 7:42:45 PM UTC] daemon.notice: netifd: Interface 'wan_6' has link connectivity
[May 11, 2026, 7:42:45 PM UTC] daemon.notice: netifd: Interface 'wan_6' is setting up now
[May 11, 2026, 7:42:45 PM UTC] user.notice: firewall: Reloading firewall due to ifup of wan (pppoe-wan)
[May 11, 2026, 7:42:45 PM UTC] daemon.notice: netifd: Interface 'wan_6' is now up
[May 11, 2026, 7:42:46 PM UTC] user.notice: firewall: Reloading firewall due to ifupdate of wan (pppoe-wan)
[May 11, 2026, 7:42:46 PM UTC] user.notice: firewall: Reloading firewall due to ifup of wan_6 (pppoe-wan)
[May 11, 2026, 7:42:52 PM UTC] daemon.notice: netifd: Network device 'eth0' link is down
[May 11, 2026, 7:42:52 PM UTC] daemon.notice: netifd: Interface 'wan' has link connectivity loss
[May 11, 2026, 7:42:52 PM UTC] kern.info: [ 4018.497682] mtk_soc_eth 15100000.ethernet eth0: Link is Down
