"DHCPv6 address ... timeout preferred 150 valid 450 messages" in syslog

Anybody having the same problem with Ubuntu 18.04?

I had to redirect these messages to another log file, so that my syslog file is not filled with these.

To do this I edited /etc/rsyslog.d/50-default.conf and added:

:programname,isequal,"systemd-networkd" -/var/log/systemd-networkd.log
:programname,isequal,"systemd-networkd" stop

A permanent solution is still expected.

Hi, same issue here do you found a better solution ?

I m not sure my IPV6 config (vpc/subnet/route) is optimal... not a network guy at all... but it seems to work find with IPV6 (site accessible from outside)... but I have the same annoying msg related to DHCP ipv6 in my syslog.

Edited by: EdFloyd on Nov 29, 2018 5:40 AM

I contacted AWS support about this and they said it's normal and the messages can be prevented by doing this:

1. Make a directory /etc/systemd/system/systemd-networkd.service.d/ if it does not exist already
   mkdir -p /etc/systemd/system/systemd-networkd.service.d/
2. Open the /etc/systemd/system/systemd-networkd.service.d/logllevel.conf file
   vi /etc/systemd/system/systemd-networkd.service.d/logllevel.conf
3. Paste below two lines, make sure you are not leaving any space before/after those lines

[Service]
Environment=SYSTEMD_LOG_LEVEL=notice

4. Run below commands to reload daemon and restart systemd-networkd service
   systemctl daemon-reload
   systemctl restart systemd-networkd