21.02.0 rc1 x86. I have a LTE modem as wan1 (ModemManager), with another L2TP connection as wan2 (traffic running over wan1).
When wan2 connects, my existing wan1 connection disconnects and the modem is no longer detected. Both interfaces stop working and show as not detected in network interfaces. Restarting them does not work. Rebooting repeats the process, wan1 connects, wan2 connects, both wan interfaces stop immediately.
Once disconnected mmcli no longer shows any modems: mmcli -L produces "error: couldn't find the ModemManager process in the bus"
I have mwan3 installed but not configured yet. I also used the same lte/l2tp configuration for testing with 19.07.6 without any issues (moving to 21.02 for fixed geoip).
Below is the log of the disconnect after setting l2tp to not start at boot and restarting the interface in luci manually. I've removed some ips and some incidental hotplug tty device scanning to fit in the forum limit
Am I missing something obvious? It's hard to tell with the log if the warnings about the virtual ppp0 are related.
Sat May 1 14:14:11 2021 daemon.notice netifd: Interface 'WAN2' is setting up now
Sat May 1 14:14:11 2021 daemon.notice xl2tpd[5276]: Connecting to host <l2tphost>, port 1701
Sat May 1 14:14:11 2021 daemon.notice xl2tpd[5276]: Connection established to <l2tphost>, 1701. Local: 18596, Remote: 9581 (ref=0/0).
Sat May 1 14:14:11 2021 daemon.notice xl2tpd[5276]: Calling on tunnel 18596
Sat May 1 14:14:11 2021 daemon.notice xl2tpd[5276]: Call established with <l2tphost>, Local: 28243, Remote: 55606, Serial: 1 (ref=0/0)
Sat May 1 14:14:11 2021 daemon.debug xl2tpd[5276]: start_pppd: I'm running:
Sat May 1 14:14:11 2021 daemon.debug xl2tpd[5276]: "/usr/sbin/pppd"
Sat May 1 14:14:11 2021 daemon.debug xl2tpd[5276]: "plugin"
Sat May 1 14:14:11 2021 daemon.debug xl2tpd[5276]: "pppol2tp.so"
Sat May 1 14:14:11 2021 daemon.debug xl2tpd[5276]: "pppol2tp"
Sat May 1 14:14:11 2021 daemon.debug xl2tpd[5276]: "8"
Sat May 1 14:14:11 2021 daemon.debug xl2tpd[5276]: "passive"
Sat May 1 14:14:11 2021 daemon.debug xl2tpd[5276]: "nodetach"
Sat May 1 14:14:11 2021 daemon.debug xl2tpd[5276]: ":"
Sat May 1 14:14:11 2021 daemon.debug xl2tpd[5276]: "file"
Sat May 1 14:14:11 2021 daemon.debug xl2tpd[5276]: "/tmp/l2tp/options.WAN2"
Sat May 1 14:14:11 2021 daemon.info pppd[9947]: Plugin pppol2tp.so loaded.
Sat May 1 14:14:11 2021 daemon.notice pppd[9947]: pppd 2.4.8 started by root, uid 0
Sat May 1 14:14:11 2021 kern.info kernel: [ 164.481096] l2tp-WAN2: renamed from ppp0
Sat May 1 14:14:11 2021 daemon.info pppd[9947]: Renamed interface ppp0 to l2tp-WAN2
Sat May 1 14:14:11 2021 daemon.info pppd[9947]: Using interface l2tp-WAN2
Sat May 1 14:14:11 2021 daemon.notice pppd[9947]: Connect: l2tp-WAN2 <-->
Sat May 1 14:14:11 2021 user.notice ModemManager: hotplug: add network interface ppp0: event processed
Sat May 1 14:14:11 2021 user.notice ModemManager: hotplug: event reported: action=add, name=ppp0, subsystem=net
Sat May 1 14:14:11 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:11 2021 daemon.warn [5334]: <warn> [ppp0] invalid sysfs path read for net/ppp0
Sat May 1 14:14:11 2021 user.notice ModemManager: hotplug: move network interface l2tp-WAN2: event processed
Sat May 1 14:14:11 2021 user.notice ModemManager: hotplug: event reported: action=move, name=l2tp-WAN2, subsystem=net
Sat May 1 14:14:12 2021 daemon.info pppd[9947]: CHAP authentication succeeded: IP47353
Sat May 1 14:14:12 2021 daemon.notice pppd[9947]: CHAP authentication succeeded
Sat May 1 14:14:12 2021 daemon.notice pppd[9947]: local IP address <l2tpip>
Sat May 1 14:14:12 2021 daemon.notice pppd[9947]: remote IP address <remoteip>
Sat May 1 14:14:12 2021 daemon.notice pppd[9947]: primary DNS address 208.67.220.220
Sat May 1 14:14:12 2021 daemon.notice pppd[9947]: secondary DNS address 208.67.222.222
Sat May 1 14:14:12 2021 daemon.debug dnsmasq[4157]: listening on l2tp-WAN2(#8): <l2tpip> port 53
Sat May 1 14:14:12 2021 daemon.notice pppd[9947]: local LL address <ipv6>
Sat May 1 14:14:12 2021 daemon.notice pppd[9947]: remote LL address <ipv6>
Sat May 1 14:14:12 2021 daemon.debug dnsmasq[4157]: listening on l2tp-WAN2(#8): <ipv6>l2tp-WAN2 port 53
Sat May 1 14:14:12 2021 daemon.notice netifd: Network device 'l2tp-WAN2' link is up
Sat May 1 14:14:12 2021 daemon.notice netifd: Interface 'WAN2' is now up
Sat May 1 14:14:12 2021 user.notice mwan3-hotplug[10036]: mwan3 hotplug on WAN2 not called because interface disabled
Sat May 1 14:14:12 2021 user.notice firewall: Reloading firewall due to ifup of WAN2 (l2tp-WAN2)
Sat May 1 14:14:16 2021 daemon.err procd: failed to open pidfile for writing: : No such file or directory
Sat May 1 14:14:16 2021 daemon.notice netifd: Interface 'WAN2' has lost the connection
Sat May 1 14:14:16 2021 daemon.debug dnsmasq[4157]: stopped listening on wwan0(#7): <ipv6>wwan0 port 53
Sat May 1 14:14:16 2021 daemon.notice netifd: Network device 'wwan0' link is down
Sat May 1 14:14:16 2021 daemon.info [10298]: <info> ModemManager (version 1.16.2) starting in system bus...
Sat May 1 14:14:16 2021 daemon.notice netifd: WAN1 (10307): stopping network
Sat May 1 14:14:16 2021 daemon.info xl2tpd[5276]: Disconnecting from <l2tphost>, Local: 18596, Remote: 9581
Sat May 1 14:14:16 2021 daemon.err xl2tpd[5276]: udp_xmit failed to <l2tphost>:1701 with err=-1:Network unreachable
Sat May 1 14:14:16 2021 daemon.debug xl2tpd[5276]: Terminating pppd: sending TERM signal to pid 9947
Sat May 1 14:14:16 2021 daemon.info xl2tpd[5276]: Connection 9581 closed to <l2tphost>, port 1701 (Goodbye!)
Sat May 1 14:14:16 2021 daemon.info pppd[9947]: Terminating on signal 15
Sat May 1 14:14:16 2021 daemon.info pppd[9947]: Connect time 0.1 minutes.
Sat May 1 14:14:16 2021 daemon.info pppd[9947]: Sent 318 bytes, received 0 bytes.
Sat May 1 14:14:16 2021 daemon.notice netifd: Network device 'l2tp-WAN2' link is down
Sat May 1 14:14:16 2021 daemon.debug dnsmasq[4157]: stopped listening on l2tp-WAN2(#8): <ipv6>l2tp-WAN2 port 53
Sat May 1 14:14:16 2021 daemon.debug dnsmasq[4157]: stopped listening on l2tp-WAN2(#8): <l2tpip> port 53
Sat May 1 14:14:16 2021 daemon.notice pppd[9947]: Connection terminated.
Sat May 1 14:14:16 2021 daemon.info pppd[9947]: Connect time 0.1 minutes.
Sat May 1 14:14:16 2021 daemon.info pppd[9947]: Sent 318 bytes, received 0 bytes.
Sat May 1 14:14:16 2021 daemon.notice netifd: WAN1 (10307): error: couldn't find modem
Sat May 1 14:14:16 2021 daemon.notice netifd: WAN1 (10307): couldn't load bearer path
Sat May 1 14:14:16 2021 daemon.notice netifd: Interface 'WAN1' is now down
Sat May 1 14:14:16 2021 daemon.debug dnsmasq[4157]: stopped listening on wwan0(#7): <wan1ip> port 53
Sat May 1 14:14:16 2021 user.notice ModemManager: hotplug: remove network interface l2tp-WAN2: event processed
Sat May 1 14:14:16 2021 user.notice ModemManager: hotplug: event reported: action=remove, name=l2tp-WAN2, subsystem=net
Sat May 1 14:14:16 2021 daemon.info pppd[9947]: Exit.
Sat May 1 14:14:16 2021 user.notice mwan3-hotplug[10304]: mwan3 hotplug on WAN2 not called because interface disabled
Sat May 1 14:14:16 2021 user.notice mwan3-hotplug[10649]: mwan3 hotplug on WAN1 not called because interface disabled
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: checking if ModemManager is available...
Sat May 1 14:14:17 2021 daemon.err xl2tpd[5276]: udp_xmit failed to <l2tphost>:1701 with err=-1:Network unreachable
Sat May 1 14:14:17 2021 daemon.notice netifd: Interface 'WAN2' is now down
Sat May 1 14:14:17 2021 daemon.notice netifd: Interface 'WAN2' is setting up now
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=tty28, subsystem=tty, sysfspath=/sys/devices/virtual/tty/tty28
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: event reported: action=add, name=tty28, subsystem=tty
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:17 2021 daemon.debug xl2tpd[5276]: No such tunnel 'l2tp-WAN2'
Sat May 1 14:14:17 2021 daemon.notice netifd: WAN2 (10878): xl2tpd-control: Remove l2tp-WAN2 failed
Sat May 1 14:14:17 2021 daemon.notice netifd: Interface 'WAN2' is now down
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=ttyS15, subsystem=tty, sysfspath=/sys/devices/platform/serial8250/tty/ttyS15
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: event reported: action=add, name=ttyS15, subsystem=tty
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=tty56, subsystem=tty, sysfspath=/sys/devices/virtual/tty/tty56
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: event reported: action=add, name=tty56, subsystem=tty
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=tty18, subsystem=tty, sysfspath=/sys/devices/virtual/tty/tty18
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: event reported: action=add, name=tty18, subsystem=tty
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=tty1, subsystem=tty, sysfspath=/sys/devices/virtual/tty/tty1
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: event reported: action=add, name=tty1, subsystem=tty
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=tty46, subsystem=tty, sysfspath=/sys/devices/virtual/tty/tty46
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: event reported: action=add, name=tty46, subsystem=tty
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=ttyS6, subsystem=tty, sysfspath=/sys/devices/platform/serial8250/tty/ttyS6
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: event reported: action=add, name=ttyS6, subsystem=tty
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=tty36, subsystem=tty, sysfspath=/sys/devices/virtual/tty/tty36
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: event reported: action=add, name=tty36, subsystem=tty
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=tty26, subsystem=tty, sysfspath=/sys/devices/virtual/tty/tty26
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: event reported: action=add, name=tty26, subsystem=tty
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=ttyS13, subsystem=tty, sysfspath=/sys/devices/platform/serial8250/tty/ttyS13
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: event reported: action=add, name=ttyS13, subsystem=tty
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=tty54, subsystem=tty, sysfspath=/sys/devices/virtual/tty/tty54
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: event reported: action=add, name=tty54, subsystem=tty
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=tty16, subsystem=tty, sysfspath=/sys/devices/virtual/tty/tty16
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: event reported: action=add, name=tty16, subsystem=tty
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=tty44, subsystem=tty, sysfspath=/sys/devices/virtual/tty/tty44
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: event reported: action=add, name=tty44, subsystem=tty
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:17 2021 user.notice mwan3-hotplug[11230]: mwan3 hotplug on WAN2 not called because interface disabled
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=console, subsystem=tty, sysfspath=/sys/devices/virtual/tty/console
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: event reported: action=add, name=console, subsystem=tty
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=ttyS4, subsystem=tty, sysfspath=/sys/devices/platform/serial8250/tty/ttyS4
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: event reported: action=add, name=ttyS4, subsystem=tty
Sat May 1 14:14:17 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=tty5, subsystem=tty, sysfspath=/sys/devices/virtual/tty/tty5
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: event reported: action=add, name=tty5, subsystem=tty
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=tty11, subsystem=tty, sysfspath=/sys/devices/virtual/tty/tty11
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: event reported: action=add, name=tty11, subsystem=tty
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=tty58, subsystem=tty, sysfspath=/sys/devices/virtual/tty/tty58
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: event reported: action=add, name=tty58, subsystem=tty
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=tty3, subsystem=tty, sysfspath=/sys/devices/virtual/tty/tty3
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: event reported: action=add, name=tty3, subsystem=tty
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=tty48, subsystem=tty, sysfspath=/sys/devices/virtual/tty/tty48
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: event reported: action=add, name=tty48, subsystem=tty
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=ttyS8, subsystem=tty, sysfspath=/sys/devices/platform/serial8250/tty/ttyS8
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: event reported: action=add, name=ttyS8, subsystem=tty
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=tty38, subsystem=tty, sysfspath=/sys/devices/virtual/tty/tty38
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: event reported: action=add, name=tty38, subsystem=tty
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=eth0, subsystem=net, sysfspath=/sys/devices/pci0000:00/0000:00:02.1/0000:01:00.0/net/eth0
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: event reported: action=add, name=eth0, subsystem=net
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=eth1, subsystem=net, sysfspath=/sys/devices/pci0000:00/0000:00:02.1/0000:01:00.1/net/eth1
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: event reported: action=add, name=eth1, subsystem=net
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=eth2, subsystem=net, sysfspath=/sys/devices/pci0000:00/0000:00:02.1/0000:01:00.2/net/eth2
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: event reported: action=add, name=eth2, subsystem=net
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=eth3, subsystem=net, sysfspath=/sys/devices/pci0000:00/0000:00:02.1/0000:01:00.3/net/eth3
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: event reported: action=add, name=eth3, subsystem=net
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=eth4, subsystem=net, sysfspath=/sys/devices/pci0000:00/0000:00:02.3/0000:02:00.0/net/eth4
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: event reported: action=add, name=eth4, subsystem=net
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=wwan0, subsystem=net, sysfspath=/sys/devices/pci0000:00/0000:00:10.0/usb5/5-1/5-1:1.4/net/wwan0
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: event reported: action=add, name=wwan0, subsystem=net
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: interface 'WAN1' is set to configure device '/sys/devices/pci0000:00/0000:00:10.0/usb5/5-1'
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: now waiting for modem at sysfs path /sys/devices/pci0000:00/0000:00:10.0/usb5/5-1
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=cdc-wdm0, subsystem=usbmisc, sysfspath=/sys/devices/pci0000:00/0000:00:10.0/usb5/5-1/5-1:1.4/net/wwan0
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: event reported: action=add, name=cdc-wdm0, subsystem=usbmisc
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: error: modem not detected at sysfs path
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: already waiting for modem at sysfs path /sys/devices/pci0000:00/0000:00:10.0/usb5/5-1
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=ttyUSB0, subsystem=tty, sysfspath=/sys/devices/pci0000:00/0000:00:10.0/usb5/5-1/5-1:1.0/ttyUSB0/tty/ttyUSB0
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: event reported: action=add, name=ttyUSB0, subsystem=tty
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: already waiting for modem at sysfs path /sys/devices/pci0000:00/0000:00:10.0/usb5/5-1
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=ttyUSB1, subsystem=tty, sysfspath=/sys/devices/pci0000:00/0000:00:10.0/usb5/5-1/5-1:1.1/ttyUSB1/tty/ttyUSB1
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: event reported: action=add, name=ttyUSB1, subsystem=tty
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: already waiting for modem at sysfs path /sys/devices/pci0000:00/0000:00:10.0/usb5/5-1
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=ttyUSB2, subsystem=tty, sysfspath=/sys/devices/pci0000:00/0000:00:10.0/usb5/5-1/5-1:1.2/ttyUSB2/tty/ttyUSB2
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: event reported: action=add, name=ttyUSB2, subsystem=tty
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: already waiting for modem at sysfs path /sys/devices/pci0000:00/0000:00:10.0/usb5/5-1
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=ttyUSB3, subsystem=tty, sysfspath=/sys/devices/pci0000:00/0000:00:10.0/usb5/5-1/5-1:1.3/ttyUSB3/tty/ttyUSB3
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: event reported: action=add, name=ttyUSB3, subsystem=tty
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: already waiting for modem at sysfs path /sys/devices/pci0000:00/0000:00:10.0/usb5/5-1
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: cached event found: action=add, name=ppp0, subsystem=net, sysfspath=/sys/devices/virtual/net/ppp0
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: event reported: action=add, name=ppp0, subsystem=net
Sat May 1 14:14:18 2021 user.notice ModemManager: hotplug: error: parent device sysfspath not found
Sat May 1 14:14:18 2021 daemon.warn [10298]: <warn> [ppp0] invalid sysfs path read for net/ppp0
Sat May 1 14:14:19 2021 daemon.err xl2tpd[5276]: udp_xmit failed to <l2tphost>:1701 with err=-1:Network unreachable