here is what i was able to retrieve. Interface name is "kpn" with vlan6.
Connect time for each cycle is always 0.2 minutes.
Is this the cause: pppd[11376]? No idea what it stands for btw.
Fri Jan 20 13:52:30 2023 kern.info kernel: [ 307.102640] mvneta f1070000.ethernet eth0: configuring for fixed/rgmii-id link mode
Fri Jan 20 13:52:30 2023 daemon.notice netifd: Interface 'kpn' is disabled
Fri Jan 20 13:52:30 2023 kern.info kernel: [ 307.110905] mvneta f1070000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off
Fri Jan 20 13:52:30 2023 kern.info kernel: [ 307.122099] mvneta f1070000.ethernet eth0: Link is Down
Fri Jan 20 13:52:30 2023 kern.info kernel: [ 307.132758] mvneta f1070000.ethernet eth0: configuring for fixed/rgmii-id link mode
Fri Jan 20 13:52:30 2023 kern.info kernel: [ 307.140777] mvneta f1070000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off
Fri Jan 20 13:52:30 2023 kern.info kernel: [ 307.144819] mv88e6085 f1072004.mdio-mii:00 wan: configuring for phy/gmii link mode
Fri Jan 20 13:52:30 2023 kern.info kernel: [ 307.161379] 8021q: adding VLAN 0 to HW filter on device wan
Fri Jan 20 13:52:30 2023 daemon.notice netifd: Interface 'kpn' is enabled
Fri Jan 20 13:52:30 2023 daemon.notice netifd: Interface 'kpn' is setting up now
Fri Jan 20 13:52:30 2023 daemon.notice netifd: 8021q 'wan.6' link is down
Fri Jan 20 13:52:30 2023 daemon.notice netifd: Interface 'kpn' has link connectivity loss
Fri Jan 20 13:52:30 2023 daemon.notice netifd: Network device 'wan' link is down
Fri Jan 20 13:52:30 2023 daemon.notice netifd: Interface 'kpn' is now down
Fri Jan 20 13:52:30 2023 kern.info kernel: [ 307.295625] mvneta f1070000.ethernet eth0: Link is Down
Fri Jan 20 13:52:30 2023 kern.info kernel: [ 307.306152] mvneta f1070000.ethernet eth0: configuring for fixed/rgmii-id link mode
Fri Jan 20 13:52:30 2023 kern.info kernel: [ 307.314153] mvneta f1070000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off
Fri Jan 20 13:52:30 2023 daemon.notice netifd: Interface 'kpn' is disabled
Fri Jan 20 13:52:30 2023 kern.info kernel: [ 307.326126] mvneta f1070000.ethernet eth0: Link is Down
Fri Jan 20 13:52:30 2023 kern.info kernel: [ 307.336571] mvneta f1070000.ethernet eth0: configuring for fixed/rgmii-id link mode
Fri Jan 20 13:52:30 2023 kern.info kernel: [ 307.344590] mvneta f1070000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off
Fri Jan 20 13:52:30 2023 kern.info kernel: [ 307.344970] mv88e6085 f1072004.mdio-mii:00 wan: configuring for phy/gmii link mode
Fri Jan 20 13:52:30 2023 kern.info kernel: [ 307.364530] 8021q: adding VLAN 0 to HW filter on device wan
Fri Jan 20 13:52:30 2023 daemon.notice netifd: Interface 'kpn' is enabled
Fri Jan 20 13:52:33 2023 daemon.notice netifd: Network device 'wan' link is up
Fri Jan 20 13:52:33 2023 kern.info kernel: [ 310.038543] mv88e6085 f1072004.mdio-mii:00 wan: Link is Up - 100Mbps/Full - flow control rx/tx
Fri Jan 20 13:52:33 2023 kern.info kernel: [ 310.047228] IPv6: ADDRCONF(NETDEV_CHANGE): wan: link becomes ready
Fri Jan 20 13:52:33 2023 kern.info kernel: [ 310.054118] IPv6: ADDRCONF(NETDEV_CHANGE): wan.6: link becomes ready
Fri Jan 20 13:52:33 2023 daemon.notice netifd: 8021q 'wan.6' link is up
Fri Jan 20 13:52:33 2023 daemon.notice netifd: Interface 'kpn' has link connectivity
Fri Jan 20 13:52:33 2023 daemon.notice netifd: Interface 'kpn' is setting up now
Fri Jan 20 13:52:33 2023 daemon.err insmod: module is already loaded - slhc
Fri Jan 20 13:52:33 2023 daemon.err insmod: module is already loaded - ppp_generic
Fri Jan 20 13:52:33 2023 daemon.err insmod: module is already loaded - pppox
Fri Jan 20 13:52:33 2023 daemon.err insmod: module is already loaded - pppoe
Fri Jan 20 13:52:33 2023 daemon.info pppd[11376]: Plugin pppoe.so loaded.
Fri Jan 20 13:52:33 2023 daemon.info pppd[11376]: PPPoE plugin from pppd 2.4.9
Fri Jan 20 13:52:33 2023 daemon.notice pppd[11376]: pppd 2.4.9 started by root, uid 0
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: Send PPPOE Discovery V1T1 PADI session 0x0 length 12
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: dst ff:ff:ff:ff:ff:ff src 8c:68:c8:89:26:13
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: [service-name] [host-uniq 70 2c 00 00]
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: Recv PPPOE Discovery V1T1 PADO session 0x0 length 35
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: dst 8c:68:c8:89:26:13 src c4:44:7d:c5:7c:a4
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: [service-name] [host-uniq 70 2c 00 00] [AC-name 195.190.228.106] [end-of-list]
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: Send PPPOE Discovery V1T1 PADR session 0x0 length 12
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: dst c4:44:7d:c5:7c:a4 src 8c:68:c8:89:26:13
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: [service-name] [host-uniq 70 2c 00 00]
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: Recv PPPOE Discovery V1T1 PADS session 0x289d length 16
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: dst 8c:68:c8:89:26:13 src c4:44:7d:c5:7c:a4
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: [service-name] [host-uniq 70 2c 00 00] [end-of-list]
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: PADS: Service-Name: ''
Fri Jan 20 13:52:33 2023 daemon.info pppd[11376]: PPP session is 10397
Fri Jan 20 13:52:33 2023 daemon.warn pppd[11376]: Connected to c4:44:7d:c5:7c:a4 via interface wan.6
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: using channel 17
Fri Jan 20 13:52:33 2023 kern.info kernel: [ 310.285170] pppoe-kpn: renamed from ppp0
Fri Jan 20 13:52:33 2023 daemon.info pppd[11376]: Renamed interface ppp0 to pppoe-kpn
Fri Jan 20 13:52:33 2023 daemon.info pppd[11376]: Using interface pppoe-kpn
Fri Jan 20 13:52:33 2023 daemon.notice pppd[11376]: Connect: pppoe-kpn <--> wan.6
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: sent [LCP ConfReq id=0x1 <mru 1492> <magic 0x2205fc5a>]
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: rcvd [LCP ConfReq id=0x2 <mru 1500> <magic 0xe09af417>]
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: sent [LCP ConfAck id=0x2 <mru 1500> <magic 0xe09af417>]
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: rcvd [LCP ConfAck id=0x1 <mru 1492> <magic 0x2205fc5a>]
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: sent [LCP EchoReq id=0x0 magic=0x2205fc5a]
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: sent [PAP AuthReq id=0x1 user="internet" password=]
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: rcvd [LCP EchoRep id=0x0 magic=0xe09af417]
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: rcvd [PAP AuthAck id=0x1 "Authentication success,Welcome!"]
Fri Jan 20 13:52:33 2023 daemon.info pppd[11376]: Remote message: Authentication success,Welcome!
Fri Jan 20 13:52:33 2023 daemon.notice pppd[11376]: PAP authentication succeeded
Fri Jan 20 13:52:33 2023 daemon.notice pppd[11376]: peer from calling number C4:44:7D:C5:7C:A4 authorized
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns2 0.0.0.0>]
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: sent [IPV6CP ConfReq id=0x1 ]
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: rcvd [IPCP ConfReq id=0x1 <addr 195.190.228.106>]
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: sent [IPCP ConfAck id=0x1 <addr 195.190.228.106>]
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: rcvd [IPV6CP ConfReq id=0x1 ]
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: sent [IPV6CP ConfAck id=0x1 ]
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: rcvd [IPCP ConfNak id=0x1 <addr 86.87.216.133> <ms-dns1 195.121.1.34> <ms-dns2 195.121.1.66>]
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: sent [IPCP ConfReq id=0x2 <addr 86.87.216.133> <ms-dns1 195.121.1.34> <ms-dns2 195.121.1.66>]
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: rcvd [IPV6CP ConfAck id=0x1 ]
Fri Jan 20 13:52:33 2023 daemon.notice pppd[11376]: local LL address fe80::79ba:20d1:dddf:4784
Fri Jan 20 13:52:33 2023 daemon.notice pppd[11376]: remote LL address fe80::c644:7dff:fec5:7ca4
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: Script /lib/netifd/ppp6-up started (pid 11401)
Fri Jan 20 13:52:33 2023 daemon.warn dnsmasq[1]: failed to create listening socket for fe80::c644:7dff:fec5:7ca4%pppoe-kpn: Address not available
Fri Jan 20 13:52:33 2023 daemon.warn dnsmasq[1]: failed to create listening socket for fe80::c644:7dff:fec5:7ca4%pppoe-kpn: Address not available
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: rcvd [IPCP ConfAck id=0x2 <addr 86.87.216.133> <ms-dns1 195.121.1.34> <ms-dns2 195.121.1.66>]
Fri Jan 20 13:52:33 2023 daemon.notice pppd[11376]: local IP address 86..xxx
Fri Jan 20 13:52:33 2023 daemon.notice pppd[11376]: remote IP address 195.xxx
Fri Jan 20 13:52:33 2023 daemon.notice pppd[11376]: primary DNS address 195.121.1.34
Fri Jan 20 13:52:33 2023 daemon.notice pppd[11376]: secondary DNS address 195.121.1.66
Fri Jan 20 13:52:33 2023 daemon.warn dnsmasq[1]: failed to create listening socket for fe80::c644:7dff:fec5:7ca4%pppoe-kpn: Address not available
Fri Jan 20 13:52:33 2023 daemon.warn dnsmasq[1]: failed to create listening socket for fe80::c644:7dff:fec5:7ca4%pppoe-kpn: Address not available
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: Script /lib/netifd/ppp-up started (pid 11402)
Fri Jan 20 13:52:33 2023 daemon.notice netifd: Network device 'pppoe-kpn' link is up
Fri Jan 20 13:52:33 2023 daemon.notice netifd: Network alias 'pppoe-kpn' link is up
Fri Jan 20 13:52:33 2023 daemon.notice netifd: Interface 'kpn' is now up
Fri Jan 20 13:52:33 2023 daemon.info dnsmasq[1]: reading /tmp/resolv.conf.d/resolv.conf.auto
Fri Jan 20 13:52:33 2023 daemon.info dnsmasq[1]: using nameserver 195.121.1.34#53
Fri Jan 20 13:52:33 2023 daemon.info dnsmasq[1]: using nameserver 195.121.1.66#53
Fri Jan 20 13:52:33 2023 daemon.info dnsmasq[1]: using only locally-known addresses for test
Fri Jan 20 13:52:33 2023 daemon.info dnsmasq[1]: using only locally-known addresses for onion
Fri Jan 20 13:52:33 2023 daemon.info dnsmasq[1]: using only locally-known addresses for localhost
Fri Jan 20 13:52:33 2023 daemon.info dnsmasq[1]: using only locally-known addresses for local
Fri Jan 20 13:52:33 2023 daemon.info dnsmasq[1]: using only locally-known addresses for invalid
Fri Jan 20 13:52:33 2023 daemon.info dnsmasq[1]: using only locally-known addresses for bind
Fri Jan 20 13:52:33 2023 daemon.info dnsmasq[1]: using only locally-known addresses for lan
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: Script /lib/netifd/ppp-up finished (pid 11402), status = 0x1
Fri Jan 20 13:52:33 2023 daemon.notice netifd: Interface 'kpn_6' is enabled
Fri Jan 20 13:52:33 2023 daemon.notice netifd: Interface 'kpn_6' has link connectivity
Fri Jan 20 13:52:33 2023 daemon.notice netifd: Interface 'kpn_6' is setting up now
Fri Jan 20 13:52:33 2023 daemon.debug pppd[11376]: Script /lib/netifd/ppp6-up finished (pid 11401), status = 0x0
Fri Jan 20 13:52:33 2023 user.notice firewall: Reloading firewall due to ifup of kpn (pppoe-kpn)
Fri Jan 20 13:52:34 2023 user.notice firewall: Reloading firewall due to ifupdate of kpn (pppoe-kpn)
Fri Jan 20 13:52:34 2023 daemon.warn dnsmasq[1]: failed to create listening socket for fe80::c644:7dff:fec5:7ca4%pppoe-kpn: Address not available
Fri Jan 20 13:52:34 2023 daemon.warn dnsmasq[1]: failed to create listening socket for fe80::c644:7dff:fec5:7ca4%pppoe-kpn: Address not available
Fri Jan 20 13:52:35 2023 daemon.warn dnsmasq[1]: failed to create listening socket for fe80::c644:7dff:fec5:7ca4%pppoe-kpn: Address not available
Fri Jan 20 13:52:35 2023 daemon.warn dnsmasq[1]: failed to create listening socket for fe80::c644:7dff:fec5:7ca4%pppoe-kpn: Address not available
Fri Jan 20 13:52:43 2023 daemon.info pppd[11376]: No response to 5 echo-requests
Fri Jan 20 13:52:43 2023 daemon.notice pppd[11376]: Serial link appears to be disconnected.
Fri Jan 20 13:52:43 2023 daemon.info pppd[11376]: Connect time 0.2 minutes.
Fri Jan 20 13:52:43 2023 daemon.info pppd[11376]: Sent 3989 bytes, received 1099 bytes.
Fri Jan 20 13:52:43 2023 daemon.warn dnsmasq[1]: failed to create listening socket for fe80::c644:7dff:fec5:7ca4%pppoe-kpn: Address not available
Fri Jan 20 13:52:43 2023 daemon.warn dnsmasq[1]: failed to create listening socket for fe80::c644:7dff:fec5:7ca4%pppoe-kpn: Address not available
Fri Jan 20 13:52:43 2023 daemon.debug pppd[11376]: Script /lib/netifd/ppp-down started (pid 11651)
Fri Jan 20 13:52:43 2023 daemon.notice netifd: Network device 'pppoe-kpn' link is down
Fri Jan 20 13:52:43 2023 daemon.notice netifd: Network alias 'pppoe-kpn' link is down
Fri Jan 20 13:52:43 2023 daemon.notice netifd: Interface 'kpn_6' has link connectivity loss
Fri Jan 20 13:52:43 2023 daemon.err odhcp6c[11449]: Failed to send RS (Network unreachable)
Fri Jan 20 13:52:43 2023 daemon.debug pppd[11376]: Script /lib/netifd/ppp-down started (pid 11652)
Fri Jan 20 13:52:43 2023 daemon.debug pppd[11376]: sent [LCP TermReq id=0x2 "Peer not responding"]
Fri Jan 20 13:52:43 2023 daemon.notice netifd: Interface 'kpn' has lost the connection