[Bug 1765173] Re: networkd waits 10 seconds for ipv6 network discovery by default

Ryan Harper 1765173 at bugs.launchpad.net
Wed Apr 18 23:52:49 UTC 2018 

I disagree that SLAAC is something that we should by default block reaching network-online.target. 
 
In general we cannot know in advance whether or not another system in the same subnet is providing Router Advertisements to other instances.

If one instance in my VPC is running radvd, ec2 has no knowledge of this
meaning that if  cloud-init sets accept-ra: false; that disables
accepting RAs and that breaks this use-case; this is similar for LXD as
well.

Additionally, accept-ra:false doesn't mean networkd doesn't handle RA,
it also disables accept-ra in the kernel as well;

I believe that *IF* you are running an instance where you expect to use
SLAAC and know that you won't use other means of network configuration
then that instance should set some sort of flag to indicate that you
want network-online.target to wait for a SLAAC response.

No matter how forward looking we want to be; it doesn't make sense to
punish the majority of boots today with a 10 second timeout.

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https://bugs.launchpad.net/bugs/1765173

Title:
  networkd waits 10 seconds for ipv6 network discovery by default

Status in cloud-init package in Ubuntu:
  New
Status in netplan.io package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  1.
  $ lsb_release -rd
  Description:	Ubuntu Bionic Beaver (development branch)
  Release:	18.04

  2.
  $ apt-cache policy systemd
  systemd:
    Installed: 237-3ubuntu8
    Candidate: 237-3ubuntu8
    Version table:
   *** 237-3ubuntu8 500
          500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          100 /var/lib/dpkg/status

  3. systemd-networkd-wait-online doesn't block for 10 seconds waiting
  on an IPV6 Router Advertisement

  4. systemd-networkd sends at least two RA solicitation packets waiting
  for a response before setting the link to configured.  This blocks the
  boot for every Ubuntu system where it does not have a IPV6 router
  responding to solicitations.  THis includes bionic containers, cloud
  instances, vms and physical machines.

  --

  We can see that we're spending 13 seconds waiting  for networkd to say
  the network is up.

  % systemd-analyze blame
           13.326s systemd-networkd-wait-online.service
             999ms cloud-init-local.service
             954ms cloud-init.service
             887ms cloud-config.service
             749ms dev-vda1.device
             666ms cloud-final.service
             248ms keyboard-setup.service
             175ms systemd-udev-trigger.service
             171ms lxd-containers.service
             165ms snapd.service
             154ms apparmor.service
             147ms ssh.service
             144ms systemd-timesyncd.service
             133ms grub-common.service
             130ms systemd-journald.service
             130ms accounts-daemon.service
              99ms systemd-modules-load.service
              98ms systemd-resolved.service
              94ms apport.service
              92ms rsyslog.service
              88ms systemd-logind.service
              80ms lvm2-monitor.service
              75ms iscsid.service
              64ms ebtables.service
              62ms user at 1000.service
              54ms dev-mqueue.mount
              53ms ufw.service
              52ms systemd-remount-fs.service
              52ms kmod-static-nodes.service
              34ms systemd-journal-flush.service
              34ms polkit.service
              32ms systemd-tmpfiles-setup-dev.service
              27ms systemd-udevd.service
              26ms systemd-networkd.service
              26ms systemd-sysctl.service
              25ms systemd-tmpfiles-setup.service
              21ms dev-hugepages.mount
              17ms sys-kernel-debug.mount
              16ms console-setup.service
              15ms plymouth-read-write.service
              15ms snapd.socket
              15ms plymouth-quit.service
              14ms systemd-update-utmp.service
              10ms systemd-user-sessions.service
               9ms boot-efi.mount
               8ms sys-fs-fuse-connections.mount
               8ms systemd-update-utmp-runlevel.service
               8ms lxd.socket
               7ms blk-availability.service
               5ms systemd-random-seed.service
               3ms setvtrgb.service
               3ms plymouth-quit-wait.service
               3ms sys-kernel-config.mount

  
  Here we can see that we start networking at 18:30:51.69, and then IPv6 NDISC runs for 10 seconds
  and then the link is configured at 18:31:05.  *AND* we see NDISC stays around and continues to see if it gets a RA packet.

  $ journalctl -o short-precise -u systemd-networkd.service  | egrep "(Starting Network|Discovering IPv6 routers|NDISC|Configured)" 
  Apr 18 18:30:51.691532 rharper-b1 systemd[1]: Starting Network Service...
  Apr 18 18:30:53.031041 rharper-b1 systemd-networkd[603]: ens3: Discovering IPv6 routers
  Apr 18 18:30:53.031306 rharper-b1 systemd-networkd[603]: NDISC: Started IPv6 Router Solicitation client
  Apr 18 18:30:53.031612 rharper-b1 systemd-networkd[603]: NDISC: Sent Router Solicitation, next solicitation in 4s
  Apr 18 18:30:57.092282 rharper-b1 systemd-networkd[603]: NDISC: Sent Router Solicitation, next solicitation in 8s
  Apr 18 18:31:05.040895 rharper-b1 systemd-networkd[603]: NDISC: No RA received before link confirmation timeout
  Apr 18 18:31:05.040932 rharper-b1 systemd-networkd[603]: NDISC: Invoking callback for 't'.
  Apr 18 18:31:05.041099 rharper-b1 systemd-networkd[603]: ens3: Configured
  Apr 18 18:31:05.484261 rharper-b1 systemd-networkd[603]: NDISC: Sent Router Solicitation, next solicitation in 16s
  Apr 18 18:31:21.550612 rharper-b1 systemd-networkd[603]: NDISC: Sent Router Solicitation, next solicitation in 33s
  Apr 18 18:31:54.706283 rharper-b1 systemd-networkd[603]: NDISC: Sent Router Solicitation, next solicitation in 1min 5s
  Apr 18 18:33:00.232685 rharper-b1 systemd-networkd[603]: NDISC: Sent Router Solicitation, next solicitation in 2min 15s
  Apr 18 18:35:15.436376 rharper-b1 systemd-networkd[603]: NDISC: Sent Router Solicitation, next solicitation in 4min 32s
  Apr 18 18:39:48.111413 rharper-b1 systemd-networkd[603]: NDISC: Sent Router Solicitation, next solicitation in 9min 16s

  networkd runs ndisc if your host is configured with ipv6 forwarding
  disabled and accept_ra enabled.

  % sysctl net.ipv6.conf.all.forwarding
  net.ipv6.conf.all.forwarding = 0

  % sysctl net.ipv6.conf.all.accept_ra
  net.ipv6.conf.all.accept_ra = 1

  So ndisc path is expected per systemd code.  We should be able to
  disable the NDISC link timeout; especially since NDISC stays around to
  process RA packets later on anyhow.  Nothing is gained by blocking
  boot waiting for an RA packet.  This is also a change in behavior on
  previous LTS, Xenial where the RA handling is done in the kernel
  rather than netowkrd.

  
  Full debug output of systemd-networkd during this boot.

  
  % journalctl -o short-precise -u systemd-networkd.service
  -- Logs begin at Wed 2018-04-18 18:30:19 UTC, end at Wed 2018-04-18 18:35:15 UTC. --
  Apr 18 18:30:34.371090 rharper-b1 systemd[1]: Stopping Network Service...
  Apr 18 18:30:34.399603 rharper-b1 systemd[1]: Stopped Network Service.
  -- Reboot --
  Apr 18 18:30:51.691532 rharper-b1 systemd[1]: Starting Network Service...
  Apr 18 18:30:51.714593 rharper-b1 systemd-networkd[603]: Bus n/a: changing state UNSET → OPENING
  Apr 18 18:30:51.714736 rharper-b1 systemd-networkd[603]: Added inotify watch for /run on bus n/a: 2
  Apr 18 18:30:51.714754 rharper-b1 systemd-networkd[603]: Added inotify watch for /run/dbus on bus n/a: -1
  Apr 18 18:30:51.714795 rharper-b1 systemd-networkd[603]: Bus n/a: changing state OPENING → WATCH_BIND
  Apr 18 18:30:51.715122 rharper-b1 systemd-networkd[603]: Failed to open configuration file '/etc/systemd/networkd.conf': No such file or directory
  Apr 18 18:30:51.715134 rharper-b1 systemd-networkd[603]: timestamp of '/etc/systemd/network' changed
  Apr 18 18:30:51.715144 rharper-b1 systemd-networkd[603]: timestamp of '/run/systemd/network' changed
  Apr 18 18:30:51.715334 rharper-b1 systemd-networkd[603]: Ignoring /run/systemd/network/10-netplan-ens3.network, because it's not a regular file with suffix .netdev.
  Apr 18 18:30:51.715342 rharper-b1 systemd-networkd[603]: Ignoring /run/systemd/network/10-netplan-ens3.link, because it's not a regular file with suffix .netdev.
  Apr 18 18:30:51.715375 rharper-b1 systemd-networkd[603]: Ignoring /lib/systemd/network/80-container-vz.network, because it's not a regular file with suffix .netdev.
  Apr 18 18:30:51.715382 rharper-b1 systemd-networkd[603]: Ignoring /lib/systemd/network/99-default.link, because it's not a regular file with suffix .netdev.
  Apr 18 18:30:51.715389 rharper-b1 systemd-networkd[603]: Ignoring /lib/systemd/network/80-container-host0.network, because it's not a regular file with suffix .netdev.
  Apr 18 18:30:51.715397 rharper-b1 systemd-networkd[603]: Ignoring /lib/systemd/network/80-container-ve.network, because it's not a regular file with suffix .netdev.
  Apr 18 18:30:51.715573 rharper-b1 systemd-networkd[603]: Ignoring /run/systemd/network/10-netplan-ens3.link, because it's not a regular file with suffix .network.
  Apr 18 18:30:51.715603 rharper-b1 systemd-networkd[603]: Ignoring /lib/systemd/network/99-default.link, because it's not a regular file with suffix .network.
  Apr 18 18:30:51.717227 rharper-b1 systemd-networkd[603]: ens3: Flags change: +MULTICAST +BROADCAST
  Apr 18 18:30:51.717240 rharper-b1 systemd-networkd[603]: ens3: Link 2 added
  Apr 18 18:30:51.717552 rharper-b1 systemd-networkd[603]: ens3: udev initialized link
  Apr 18 18:30:51.717585 rharper-b1 systemd-networkd[603]: ens3: Saved original MTU: 1500
  Apr 18 18:30:51.717597 rharper-b1 systemd-networkd[603]: lo: Flags change: +LOOPBACK +UP +LOWER_UP +RUNNING
  Apr 18 18:30:51.717628 rharper-b1 systemd-networkd[603]: lo: Link 1 added
  Apr 18 18:30:51.717869 rharper-b1 systemd-networkd[603]: lo: udev initialized link
  Apr 18 18:30:51.717900 rharper-b1 systemd-networkd[603]: lo: Saved original MTU: 0
  Apr 18 18:30:51.717987 rharper-b1 systemd-networkd[603]: lo: Adding address: ::1/128 (valid forever)
  Apr 18 18:30:51.717998 rharper-b1 systemd-networkd[603]: lo: Adding address: 127.0.0.1/8 (valid forever)
  Apr 18 18:30:51.718115 rharper-b1 systemd-networkd[603]: rtnl: received address with invalid family 129, ignoring
  Apr 18 18:30:51.718293 rharper-b1 systemd-networkd[603]: Enumeration completed
  Apr 18 18:30:51.718444 rharper-b1 systemd-networkd[603]: ens3: Link state is up-to-date
  Apr 18 18:30:51.718493 rharper-b1 systemd[1]: Started Network Service.
  Apr 18 18:30:51.720311 rharper-b1 systemd-networkd[603]: ens3: found matching network '/run/systemd/network/10-netplan-ens3.network'
  Apr 18 18:30:51.720850 rharper-b1 systemd-networkd[603]: lo: Link is not managed by us
  Apr 18 18:30:51.720915 rharper-b1 systemd-networkd[603]: ens3: Bringing link up
  Apr 18 18:30:51.720974 rharper-b1 systemd-networkd[603]: ens3: IPv6 successfully enabled
  Apr 18 18:30:51.721574 rharper-b1 systemd-networkd[603]: lo: Link state is up-to-date
  Apr 18 18:30:51.721778 rharper-b1 systemd-networkd[603]: Virtualization QEMU found in DMI (/sys/class/dmi/id/sys_vendor)
  Apr 18 18:30:51.721792 rharper-b1 systemd-networkd[603]: Virtualization found, CPUID=KVMKVMKVM
  Apr 18 18:30:51.721799 rharper-b1 systemd-networkd[603]: Found VM virtualization kvm
  Apr 18 18:30:51.721808 rharper-b1 systemd-networkd[603]: lo: Unmanaged
  Apr 18 18:30:51.722017 rharper-b1 systemd-networkd[603]: ens3: Flags change: +UP +LOWER_UP +RUNNING
  Apr 18 18:30:51.727823 rharper-b1 systemd-networkd[603]: LLDP: Started LLDP client
  Apr 18 18:30:51.727831 rharper-b1 systemd-networkd[603]: ens3: Started LLDP.
  Apr 18 18:30:51.727838 rharper-b1 systemd-networkd[603]: ens3: Gained carrier
  Apr 18 18:30:51.727852 rharper-b1 systemd-networkd[603]: ens3: Acquiring DHCPv4 lease
  Apr 18 18:30:51.727965 rharper-b1 systemd-networkd[603]: DHCP CLIENT (0x9bbb16d3): STARTED on ifindex 2
  Apr 18 18:30:51.728263 rharper-b1 systemd-networkd[603]: DHCP CLIENT (0x9bbb16d3): DISCOVER
  Apr 18 18:30:51.729279 rharper-b1 systemd-networkd[603]: DHCP CLIENT (0x9bbb16d3): OFFER
  Apr 18 18:30:51.729361 rharper-b1 systemd-networkd[603]: DHCP CLIENT (0x9bbb16d3): REQUEST (requesting)
  Apr 18 18:30:51.730084 rharper-b1 systemd-networkd[603]: DHCP CLIENT (0x9bbb16d3): ACK
  Apr 18 18:30:51.730212 rharper-b1 systemd-networkd[603]: DHCP CLIENT (0x9bbb16d3): lease expires in 59min 58s
  Apr 18 18:30:51.730221 rharper-b1 systemd-networkd[603]: DHCP CLIENT (0x9bbb16d3): T2 expires in 52min 27s
  Apr 18 18:30:51.730229 rharper-b1 systemd-networkd[603]: DHCP CLIENT (0x9bbb16d3): T1 expires in 29min 57s
  Apr 18 18:30:51.730314 rharper-b1 systemd-networkd[603]: ens3: DHCPv4 address 192.168.122.140/24 via 192.168.122.1
  Apr 18 18:30:51.730375 rharper-b1 systemd-networkd[603]: Setting transient hostname: 'rharper-b1'
  Apr 18 18:30:51.730385 rharper-b1 systemd-networkd[603]: Not connected to system bus, not setting hostname.
  Apr 18 18:30:51.730676 rharper-b1 systemd-networkd[603]: ens3: Updating address: 192.168.122.140/24 (valid for 1h)
  Apr 18 18:30:51.731002 rharper-b1 systemd-networkd[603]: ens3: DHCP error: could not get routes: No data available
  Apr 18 18:30:53.030808 rharper-b1 systemd-networkd[603]: ens3: Adding address: fe80::5054:ff:feba:2b98/64 (valid forever)
  Apr 18 18:30:53.030877 rharper-b1 systemd-networkd[603]: ens3: Gained IPv6LL
  Apr 18 18:30:53.031041 rharper-b1 systemd-networkd[603]: ens3: Discovering IPv6 routers
  Apr 18 18:30:53.031306 rharper-b1 systemd-networkd[603]: NDISC: Started IPv6 Router Solicitation client
  Apr 18 18:30:53.031612 rharper-b1 systemd-networkd[603]: NDISC: Sent Router Solicitation, next solicitation in 4s
  Apr 18 18:30:57.092282 rharper-b1 systemd-networkd[603]: NDISC: Sent Router Solicitation, next solicitation in 8s
  Apr 18 18:31:05.040895 rharper-b1 systemd-networkd[603]: NDISC: No RA received before link confirmation timeout
  Apr 18 18:31:05.040932 rharper-b1 systemd-networkd[603]: NDISC: Invoking callback for 't'.
  Apr 18 18:31:05.041099 rharper-b1 systemd-networkd[603]: ens3: Configured
  Apr 18 18:31:05.484261 rharper-b1 systemd-networkd[603]: NDISC: Sent Router Solicitation, next solicitation in 16s
  Apr 18 18:31:05.495751 rharper-b1 systemd-networkd[603]: Got inotify event on bus n/a.
  Apr 18 18:31:05.495842 rharper-b1 systemd-networkd[603]: Added inotify watch for /run on bus n/a: 2
  Apr 18 18:31:05.495870 rharper-b1 systemd-networkd[603]: Added inotify watch for /run/dbus on bus n/a: -1
  Apr 18 18:31:05.928832 rharper-b1 systemd-networkd[603]: Got inotify event on bus n/a.
  Apr 18 18:31:05.928914 rharper-b1 systemd-networkd[603]: Added inotify watch for /run on bus n/a: 2
  Apr 18 18:31:05.928935 rharper-b1 systemd-networkd[603]: Added inotify watch for /run/dbus on bus n/a: -1
  Apr 18 18:31:06.014785 rharper-b1 systemd-networkd[603]: Got inotify event on bus n/a.
  Apr 18 18:31:06.015036 rharper-b1 systemd-networkd[603]: Added inotify watch for /run on bus n/a: 2
  Apr 18 18:31:06.017290 rharper-b1 systemd-networkd[603]: Added inotify watch for /run/dbus on bus n/a: -1
  Apr 18 18:31:06.017532 rharper-b1 systemd-networkd[603]: Got inotify event on bus n/a.
  Apr 18 18:31:06.017581 rharper-b1 systemd-networkd[603]: Added inotify watch for /run on bus n/a: 2
  Apr 18 18:31:06.017598 rharper-b1 systemd-networkd[603]: Added inotify watch for /run/dbus on bus n/a: -1
  Apr 18 18:31:06.027908 rharper-b1 systemd-networkd[603]: Got inotify event on bus n/a.
  Apr 18 18:31:06.028491 rharper-b1 systemd-networkd[603]: Bus n/a: changing state WATCH_BIND → AUTHENTICATING
  Apr 18 18:31:06.051721 rharper-b1 systemd-networkd[603]: Bus n/a: changing state AUTHENTICATING → HELLO
  Apr 18 18:31:06.051767 rharper-b1 systemd-networkd[603]: Sent message type=method_call sender=n/a destination=org.freedesktop.DBus path=/org/freedesktop/DBus interface=org.freedesktop.DBus member=Hello cookie=1 reply_cookie=0 signature=n/a error-name=n/a error-message=n/a
  Apr 18 18:31:06.051782 rharper-b1 systemd-networkd[603]: Sent message type=method_call sender=n/a destination=org.freedesktop.DBus path=/org/freedesktop/DBus interface=org.freedesktop.DBus member=RequestName cookie=2 reply_cookie=0 signature=su error-name=n/a error-message=n/a
  Apr 18 18:31:06.051794 rharper-b1 systemd-networkd[603]: Sent message type=method_call sender=n/a destination=org.freedesktop.DBus path=/org/freedesktop/DBus interface=org.freedesktop.DBus member=AddMatch cookie=3 reply_cookie=0 signature=s error-name=n/a error-message=n/a
  Apr 18 18:31:06.051807 rharper-b1 systemd-networkd[603]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_31 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=4 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
  Apr 18 18:31:06.051819 rharper-b1 systemd-networkd[603]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_32 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=5 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
  Apr 18 18:31:06.051831 rharper-b1 systemd-networkd[603]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_31 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=6 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
  Apr 18 18:31:06.051842 rharper-b1 systemd-networkd[603]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_32 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=7 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
  Apr 18 18:31:06.051854 rharper-b1 systemd-networkd[603]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_32 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=8 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
  Apr 18 18:31:06.051868 rharper-b1 systemd-networkd[603]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_32 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=9 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
  Apr 18 18:31:06.051881 rharper-b1 systemd-networkd[603]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=10 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
  Apr 18 18:31:06.051893 rharper-b1 systemd-networkd[603]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_32 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=11 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
  Apr 18 18:31:06.051905 rharper-b1 systemd-networkd[603]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=12 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
  Apr 18 18:31:06.051916 rharper-b1 systemd-networkd[603]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_32 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=13 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
  Apr 18 18:31:06.053073 rharper-b1 systemd-networkd[603]: Got message type=method_return sender=org.freedesktop.DBus destination=:1.2 path=n/a interface=n/a member=n/a cookie=1 reply_cookie=1 signature=s error-name=n/a error-message=n/a
  Apr 18 18:31:06.053092 rharper-b1 systemd-networkd[603]: Bus n/a: changing state HELLO → RUNNING
  Apr 18 18:31:06.053151 rharper-b1 systemd-networkd[603]: Got message type=signal sender=org.freedesktop.DBus.Local destination=n/a path=/org/freedesktop/DBus/Local interface=org.freedesktop.DBus.Local member=Connected cookie=4294967295 reply_cookie=0 signature=n/a error-name=n/a error-message=n/a
  Apr 18 18:31:06.053163 rharper-b1 systemd-networkd[603]: Setting transient hostname: 'rharper-b1'
  Apr 18 18:31:06.053186 rharper-b1 systemd-networkd[603]: Sent message type=method_call sender=n/a destination=org.freedesktop.hostname1 path=/org/freedesktop/hostname1 interface=org.freedesktop.hostname1 member=SetHostname cookie=14 reply_cookie=0 signature=sb error-name=n/a error-message=n/a
  Apr 18 18:31:06.053246 rharper-b1 systemd-networkd[603]: Got message type=signal sender=org.freedesktop.DBus destination=:1.2 path=/org/freedesktop/DBus interface=org.freedesktop.DBus member=NameAcquired cookie=2 reply_cookie=0 signature=s error-name=n/a error-message=n/a
  Apr 18 18:31:06.053364 rharper-b1 systemd-networkd[603]: Got message type=signal sender=org.freedesktop.DBus destination=:1.2 path=/org/freedesktop/DBus interface=org.freedesktop.DBus member=NameAcquired cookie=3 reply_cookie=0 signature=s error-name=n/a error-message=n/a
  Apr 18 18:31:06.053409 rharper-b1 systemd-networkd[603]: Got message type=method_return sender=org.freedesktop.DBus destination=:1.2 path=n/a interface=n/a member=n/a cookie=4 reply_cookie=2 signature=u error-name=n/a error-message=n/a
  Apr 18 18:31:06.053419 rharper-b1 systemd-networkd[603]: Successfully acquired requested service name.
  Apr 18 18:31:06.053502 rharper-b1 systemd-networkd[603]: Got message type=method_return sender=org.freedesktop.DBus destination=:1.2 path=n/a interface=n/a member=n/a cookie=5 reply_cookie=3 signature=n/a error-name=n/a error-message=n/a
  Apr 18 18:31:06.053511 rharper-b1 systemd-networkd[603]: Match type='signal',sender='org.freedesktop.login1',path='/org/freedesktop/login1',interface='org.freedesktop.login1.Manager',member='PrepareForSleep' successfully installed.
  Apr 18 18:31:06.229740 rharper-b1 systemd-networkd[603]: Got message type=method_return sender=:1.6 destination=:1.2 path=n/a interface=n/a member=n/a cookie=3 reply_cookie=14 signature=n/a error-name=n/a error-message=n/a
  Apr 18 18:31:21.550612 rharper-b1 systemd-networkd[603]: NDISC: Sent Router Solicitation, next solicitation in 33s
  Apr 18 18:31:54.706283 rharper-b1 systemd-networkd[603]: NDISC: Sent Router Solicitation, next solicitation in 1min 5s
  Apr 18 18:33:00.232685 rharper-b1 systemd-networkd[603]: NDISC: Sent Router Solicitation, next solicitation in 2min 15s
  Apr 18 18:35:15.436376 rharper-b1 systemd-networkd[603]: NDISC: Sent Router Solicitation, next solicitation in 4min 32s

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: systemd 237-3ubuntu8
  ProcVersionSignature: User Name 4.15.0-15.16-generic 4.15.15
  Uname: Linux 4.15.0-15-generic x86_64
  ApportVersion: 2.20.9-0ubuntu4
  Architecture: amd64
  Date: Wed Apr 18 18:25:53 2018
  Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-15-generic root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0
  SourcePackage: systemd
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: 1.10.2-1ubuntu1
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-i440fx-bionic
  dmi.modalias: dmi:bvnSeaBIOS:bvr1.10.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-bionic:cvnQEMU:ct1:cvrpc-i440fx-bionic:
  dmi.product.name: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-bionic
  dmi.sys.vendor: QEMU

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