[FS#3771] odhcpd fails to send Router Advertisements

[OpenWrt Bugs]

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

User who did this - Craig Miller (cvmiller) 

Attached to Project - OpenWrt/LEDE Project
Summary - odhcpd fails to send Router Advertisements
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Supply the following if possible:
 - Device problem occurs on
Linksys EA3500

 - Software versions of OpenWrt/LEDE release, packages, etc.
21.02.0rc1

 - Steps to reproduce
1. Install 21.02.0rc1 on device
2. After successful install, note that your ethernet connected laptop has only a link-local address (no ULA, or GUA).
3. Log into router and run logread command looking for odhcpd errors. Note the following:

logread | grep odhcp
Sun Apr 18 03:07:34 2021 user.notice ucitrack: Setting up /etc/config/dhcp reload dependency on /etc/config/odhcpd
Sun Apr 18 03:07:38 2021 daemon.err odhcpd[1799]: Failed to send to ff02::1%lan at br-lan (Address not available)
Sun Apr 18 03:07:41 2021 daemon.err odhcpd[1799]: Failed to send to fe80::9ed6:43ff:feae:1915%lan at br-lan (Address not available)
Sun Apr 18 03:07:41 2021 daemon.err odhcp6c[2528]: Failed to send RS (Address not available)
Sun Apr 18 03:07:42 2021 daemon.err odhcpd[1799]: Failed to send to ff02::1%lan at br-lan (Address not available)
Sun Apr 18 03:07:42 2021 daemon.err odhcp6c[2528]: Failed to send SOLICIT message to ff02::1:2 (Address not available)
Sun Apr 18 03:07:48 2021 daemon.info dnsmasq[2569]: read /tmp/hosts/odhcpd - 0 addresses

The router does NOT, in fact, have the interface ff02::1%lan at br-lan

After installing ip-full, it is possible to see 'ip maddr' and see the correct interfaces on the router:

# ip maddr
1:	lo
	inet  224.0.0.1
	inet6 ff02::1
	inet6 ff01::1
...
13:	br-lan
	link  33:33:00:00:00:01
	link  33:33:00:00:00:02
	link  01:00:5e:00:00:01
	link  33:33:ff:01:70:f1
	link  33:33:ff:00:00:01
	link  33:33:ff:00:00:00
	link  33:33:00:00:00:09
	inet  224.0.0.1
	inet6 ff02::9
	inet6 ff02::1:ff00:0 users 3
	inet6 ff02::1:ff00:1 users 2
	inet6 ff02::1:ff01:70f1
	inet6 ff02::2
	inet6 ff02::1
	inet6 ff01::1

IMPACT: No attached device can receive an IPv6 address from the router

   

 

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3771

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