Hey folks,

I have powered USB hub with ethernet port. This thing is plugged into my screen and then the screen is plugged into my laptop via usb-c cable (tunderbolt + PD). However after like an hour the ethernet is somehow disconnected and cannot connect again until I reload xhci_pci kernel module like:

sudo rmmod xhci_pci ; sudo modprobe xhci_pci; sudo service network-manager restart;

When I keep my laptop on over night it works in the morning which is weird because it should be disconnected. But after ~1h of use I get disconnected. Like someone is counting my packets 🙂

When disconnected network manager tries to connect but even after several attemts no success until I reload the kernel module.

Syslog:

“`Feb 14 10:49:13 box NetworkManager[107379]: <info> [1581673753.1521] dhcp4 (wlp58s0): state changed bound -> bound Feb 14 10:49:13 box dbus-daemon[592]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' requested by ':1.670' (uid=0 pid=107379 comm="/usr/sbin/NetworkManager –no-daemon ") Feb 14 10:49:13 box systemd[1]: Starting Network Manager Script Dispatcher Service… Feb 14 10:49:13 box dbus-daemon[592]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher' Feb 14 10:49:13 box systemd[1]: Started Network Manager Script Dispatcher Service. Feb 14 10:49:16 box NetworkManager[107379]: <warn> [1581673756.7653] dhcp4 (enx000ec6a47796): request timed out Feb 14 10:49:16 box NetworkManager[107379]: <info> [1581673756.7654] dhcp4 (enx000ec6a47796): state changed unknown -> timeout Feb 14 10:49:16 box NetworkManager[107379]: <info> [1581673756.7835] dhcp4 (enx000ec6a47796): canceled DHCP transaction Feb 14 10:49:16 box NetworkManager[107379]: <info> [1581673756.7836] dhcp4 (enx000ec6a47796): state changed timeout -> done Feb 14 10:49:16 box NetworkManager[107379]: <info> [1581673756.7839] device (enx000ec6a47796): state change: ip-config -> failed (reason 'ip-config-unavailable', sys-iface-state: 'managed') Feb 14 10:49:16 box NetworkManager[107379]: <warn> [1581673756.7855] device (enx000ec6a47796): Activation: failed for connection 'Ifupdown (enx000ec6a47796)' Feb 14 10:49:16 box NetworkManager[107379]: <info> [1581673756.7859] device (enx000ec6a47796): state change: failed -> disconnected (reason 'none', sys-iface-state: 'managed') Feb 14 10:49:16 box avahi-daemon[587]: Withdrawing address record for fe80::3faa:8aca:837:2395 on enx000ec6a47796. Feb 14 10:49:16 box avahi-daemon[587]: Leaving mDNS multicast group on interface enx000ec6a47796.IPv6 with address fe80::3faa:8aca:837:2395. Feb 14 10:49:16 box avahi-daemon[587]: Interface enx000ec6a47796.IPv6 no longer relevant for mDNS. Feb 14 10:49:16 box NetworkManager[107379]: <info> [1581673756.7906] policy: auto-activating connection 'Ifupdown (enx000ec6a47796)' (bab55de5-79f6-ae3c-e677-f281d37e28d7) Feb 14 10:49:16 box NetworkManager[107379]: <info> [1581673756.7916] device (enx000ec6a47796): Activation: starting connection 'Ifupdown (enx000ec6a47796)' (bab55de5-79f6-ae3c-e677-f281d37e28d7) Feb 14 10:49:16 box NetworkManager[107379]: <info> [1581673756.7917] device (enx000ec6a47796): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed') Feb 14 10:49:16 box NetworkManager[107379]: <info> [1581673756.7924] device (enx000ec6a47796): state change: prepare -> config (reason 'none', sys-iface-state: 'managed') Feb 14 10:49:16 box NetworkManager[107379]: <info> [1581673756.7930] device (enx000ec6a47796): state change: config -> ip-config (reason 'none', sys-iface-state: 'managed') Feb 14 10:49:16 box NetworkManager[107379]: <info> [1581673756.7934] dhcp4 (enx000ec6a47796): activation: beginning transaction (timeout in 45 seconds) Feb 14 10:49:16 box avahi-daemon[587]: Joining mDNS multicast group on interface enx000ec6a47796.IPv6 with address fe80::3faa:8aca:837:2395. Feb 14 10:49:16 box avahi-daemon[587]: New relevant interface enx000ec6a47796.IPv6 for mDNS. Feb 14 10:49:16 box avahi-daemon[587]: Registering new address record for fe80::3faa:8aca:837:2395 on enx000ec6a47796.*. Feb 14 10:49:16 box slim[2204]: "No such interface “org.freedesktop.DBus.Properties” on object at path /org/freedesktop/NetworkManager/ActiveConnection/24" Feb 14 10:49:23 box systemd[1]: NetworkManager-dispatcher.service: Succeeded.

“`

Any idea where can I start sniffing?

submitted by /u/n1___
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