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

Question

Recently I created a new Ubuntu 18.04 instance from AMI ID: ubuntu/images/hvm-ssd/ubuntu-bionic-18.04-amd64-server-20180613 (ami-04f8bb7c).  
  
The syslog of this instance has many entries like this:  
  
systemd-networkd$$...$$: eth0: DHCPv6 address 2600:1f14:.../128 timeout preferred 150 valid 450  
  
The network (IPv4 and IPv6) is working without any problem. The global IPv6 (2600:1f14:...) of this instance has no problems. However the above message is logged **roughly** every 75 seconds.  
  
Any ideas?  
  
Edited by: fedkad on Jun 22, 2018 8:20 PM

EdFloyd · Answer

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

fedkad · Answer

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.

fedkad · Answer

Anybody having the same problem with Ubuntu 18.04?

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

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