diagnostics attached. This has been going on for some time now, I have attempted to figure it out myself without any luck.

the unraid server is working fine, no issues, but the log spam is really annoying

Jan 9 20:57:33 NAS dhcpcd[1700]: br0: dhcp_envoption 31.0/2: Invalid argument

Jan 9 20:57:39 NAS dhcpcd[1700]: br0: dhcp_envoption 31.0/2: Invalid argument

Jan 9 20:57:39 NAS dhcpcd[1700]: br0: dhcp_envoption 31.0/2: Invalid argument

Jan 9 20:57:52 NAS dhcpcd[1700]: br0: dhcp_envoption 31.0/2: Invalid argument

Jan 9 20:57:52 NAS dhcpcd[1700]: br0: dhcp_envoption 31.0/2: Invalid argument

Jan 9 20:59:49 NAS dhcpcd[1700]: br0: dhcp_envoption 31.0/2: Invalid argument

Jan 9 21:00:34 NAS dhcpcd[1700]: br0: dhcp_envoption 31.0/2: Invalid argument

Jan 9 21:00:39 NAS dhcpcd[1700]: br0: dhcp_envoption 31.0/2: Invalid argument

Jan 9 21:00:40 NAS dhcpcd[1700]: br0: dhcp_envoption 31.0/2: Invalid argument

Jan 9 21:00:53 NAS dhcpcd[1700]: br0: dhcp_envoption 31.0/2: Invalid argument

Jan 9 21:00:53 NAS dhcpcd[1700]: br0: dhcp_envoption 31.0/2: Invalid argument

Jan 9 21:02:49 NAS dhcpcd[1700]: br0: dhcp_envoption 31.0/2: Invalid argument

Jan 9 21:03:01 NAS dhcpcd[1700]: br0: dhcp_envoption 31.0/2: Invalid argument

as a side note, I did come across this, if it is helpful

https://github.com/NetworkConfiguration/dhcpcd/issues/367

thanks in advance for the help

nas-diagnostics-20260109-2056.zip

Edited January 10Jan 10 by RacerX330

That should be harmless. It could be an incompatibility between the router and Unraid's DHCP client, or there could also be another device on the network advertising itself as an IPv6 router sending an invalid DNS Search List.

If you are not using IPv6, setting Unraid to IPv4 only should resolve it.

Thanks appreciate the feedback.

IPv6 is enabled and the router is pfSense and there is only one. There are no other devices sending out RAs.