[FS#1274] odhcpd logspam every ~10 minutes: "Using a RA lifetime of 0 seconds"

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - Alan Jenkins (sourcejedi) 

Attached to Project - OpenWrt/LEDE Project
Summary - odhcpd logspam every ~10 minutes: "Using a RA lifetime of 0 seconds"
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - lede-17.01
Due in Version - Undecided
Due Date - Undecided
Details - Supply the following if possible:
 - Device problem occurs on

Netgear WNDR 3800

 - Software versions of OpenWrt/LEDE release, packages, etc.

Lede 17.04.1
odhcpd - 2017-10-02-c6f3d5d4-2

logspam as follows.  This is captured at a time when there are no active users.  I think all wifi clients were fully turned off / suspended.

Jan 14 04:00:47 mortar.carrier.duckdns.org odhcpd[869]: Using a RA lifetime of 0 seconds on br-lan
Jan 14 04:03:30 mortar.carrier.duckdns.org odhcpd[869]: Using a RA lifetime of 0 seconds on wlan1-1
Jan 14 04:04:50 mortar.carrier.duckdns.org odhcpd[869]: Using a RA lifetime of 0 seconds on wlan0-1
Jan 14 04:08:13 mortar.carrier.duckdns.org odhcpd[869]: Using a RA lifetime of 0 seconds on wlan1-1
Jan 14 04:09:17 mortar.carrier.duckdns.org odhcpd[869]: Using a RA lifetime of 0 seconds on br-lan
Jan 14 04:12:24 mortar.carrier.duckdns.org odhcpd[869]: Using a RA lifetime of 0 seconds on wlan0-1
Jan 14 04:13:27 mortar.carrier.duckdns.org odhcpd[869]: Using a RA lifetime of 0 seconds on br-lan
Jan 14 04:16:46 mortar.carrier.duckdns.org odhcpd[869]: Using a RA lifetime of 0 seconds on wlan0-1
Jan 14 04:17:00 mortar.carrier.duckdns.org odhcpd[869]: Using a RA lifetime of 0 seconds on wlan1-1
Jan 14 04:20:25 mortar.carrier.duckdns.org odhcpd[869]: Using a RA lifetime of 0 seconds on br-lan


I believe these are all the interfaces configured with IPv6 address assignments.  The assignments are from a ULA (see below); I have no public prefix.  I have two other wifi interfaces which do not appear in the logspam (and one WAN interface), but they have no IPv6 address assigned.

E.g. the lan config is


config interface 'lan'
	option force_link '1'
	option type 'bridge'

	option proto 'static'
	option ip6assign '60'
	option netmask '255.255.255.0'
	list ipaddr '172.16.1.1'
	list ipaddr '172.16.1.2'
	option _orig_ifname 'eth0.1'
	option _orig_bridge 'true'
	option ifname 'eth0.1'

config globals 'globals'
	option ula_prefix 'fd5e:fcf3:b885::/59'



More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1274