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Continuing forward, these patches should've fixed that 
https://review.openstack.org/#/q/topic:bug/1667756+(status:open+OR+status:merged)
I'm on Queens.

The two inside interfaces on the backup router:
[root at controller2 ~]# ip netns exec 
qrouter-0775785e-a93a-4501-917b-be92ff03f36a cat 
/proc/sys/net/ipv6/conf/qr-7fad6b1b-c9/accept_ra
1
[root at controller2 ~]# ip netns exec 
qrouter-0775785e-a93a-4501-917b-be92ff03f36a cat 
/proc/sys/net/ipv6/conf/qr-5be04815-68/accept_ra
1

Perhaps the accept_ra patches does not apply for enable/disable or 
routers changing from a normal router to a L3 HA router?
Best regards

On 08/20/2018 11:50 AM, Tobias Urdin wrote:
> Ok, so the issue here seems to be that I have a L3 HA router with 
> SLAAC, both the active and standby router will
> configure the SLAAC obtained address causing a conflict since both 
> side share the same MAC address.
>
> Is there any workaround for this? Should SLAAC even be enabled for 
> interfaces on the standby router?
>
> Best regards
> Tobias
>
> On 08/20/2018 11:37 AM, Tobias Urdin wrote:
>> Forgot [neutron] tag.
>>
>> On 08/20/2018 11:36 AM, Tobias Urdin wrote:
>>> Hello,
>>>
>>> Note: before reading, this router was a regular router but was then 
>>> disable, changed ha=true so it's now a L3 HA router, then it was 
>>> enabled again.
>>> CC openstack-dev for help or feedback if it's a possible bug.
>>>
>>> I've been testing around with IPv6 and overall the experience has 
>>> been positive but I've met some weird issue that I cannot put my 
>>> head around.
>>> So this is a neutron L3 router with an outside interface with a ipv4 
>>> and ipv6 from the provider network and one inside interface for ipv4 
>>> and one inside interface for ipv6.
>>>
>>> The instances for some reason get's there default gateway as the 
>>> ipv6 link-local (in fe80::/10) from the router with SLAAC and radvd.
>>>
>>> (1111.2222 is provider network, 1111.4444 is inside network, they 
>>> are masked so don't pay attention to the number per se)
>>>
>>> *interfaces inside router:*
>>> 15: ha-9bde1bb1-bd: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc 
>>> noqueue state UNKNOWN group default qlen 1000
>>>     link/ether fa:16:3e:05:80:32 brd ff:ff:ff:ff:ff:ff
>>>     inet 169.254.192.7/18 brd 169.254.255.255 scope global 
>>> ha-9bde1bb1-bd
>>>        valid_lft forever preferred_lft forever
>>>     inet 169.254.0.1/24 scope global ha-9bde1bb1-bd
>>>        valid_lft forever preferred_lft forever
>>>     inet6 fe80::f816:3eff:fe05:8032/64 scope link
>>>        valid_lft forever preferred_lft forever
>>> 19: qg-86e465f6-33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc 
>>> noqueue state UNKNOWN group default qlen 1000
>>>     link/ether fa:16:3e:3b:8b:a5 brd ff:ff:ff:ff:ff:ff
>>>     inet 1.2.3.4/22 scope global qg-86e465f6-33
>>>        valid_lft forever preferred_lft forever
>>>     inet6 1111:2222::f/64 scope global nodad
>>>        valid_lft forever preferred_lft forever
>>>     inet6 fe80::f816:3eff:fe3b:8ba5/64 scope link nodad
>>>        valid_lft forever preferred_lft forever
>>> 1168: qr-5be04815-68: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 
>>> qdisc noqueue state UNKNOWN group default qlen 1000
>>>     link/ether fa:16:3e:c3:85:bd brd ff:ff:ff:ff:ff:ff
>>>     inet 192.168.99.1/24 scope global qr-5be04815-68
>>>        valid_lft forever preferred_lft forever
>>>     inet6 fe80::f816:3eff:fec3:85bd/64 scope link
>>>        valid_lft forever preferred_lft forever
>>> 1169: qr-7fad6b1b-c9: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 
>>> qdisc noqueue state UNKNOWN group default qlen 1000
>>>     link/ether fa:16:3e:66:de:a8 brd ff:ff:ff:ff:ff:ff
>>>     inet6 1111:4444:0:1::1/64 scope global nodad
>>>        valid_lft forever preferred_lft forever
>>>     inet6 fe80::f816:3eff:fe66:dea8/64 scope link
>>>        valid_lft forever preferred_lft forever
>>>
>>> I get this error messages in dmesg on the network node:
>>> [581085.858869] IPv6: qr-5be04815-68: IPv6 duplicate address 
>>> 1111:4444:0:1:f816:3eff:fec3:85bd detected!
>>> [581085.997497] IPv6: qr-7fad6b1b-c9: IPv6 duplicate address 
>>> 1111:4444:0:1:f816:3eff:fe66:dea8 detected!
>>> [581142.869939] IPv6: qr-5be04815-68: IPv6 duplicate address 
>>> 1111:4444:0:1:f816:3eff:fec3:85bd detected!
>>> [581143.182371] IPv6: qr-7fad6b1b-c9: IPv6 duplicate address 
>>> 1111:4444:0:1:f816:3eff:fe66:dea8 detected!
>>>
>>> *radvd:*
>>> interface qr-7fad6b1b-c9
>>> {
>>>    AdvSendAdvert on;
>>>    MinRtrAdvInterval 30;
>>>    MaxRtrAdvInterval 100;
>>>
>>>    AdvLinkMTU 1450;
>>>
>>>    RDNSS  2001:4860:4860::8888  {};
>>>
>>>    prefix 1111:4444:0:1::/64
>>>    {
>>>         AdvOnLink on;
>>>         AdvAutonomous on;
>>>    };
>>> };
>>>
>>> *inside instance:*
>>> ipv4 = 192.168.199.7
>>> ipv6 = 1111:4444:0:1:f816:3eff:fe29:723d/64 (from radvd SLAAC)
>>>
>>> I can ping ipv4 gateway 192.168.199.1 and internet over ipv4.
>>> I can ping ipv6 gateway 1111:4444:0:1::1 but I can't ping the internet
>>>
>>> checking the ipv6 routing table on my instance I either get no 
>>> default gateway at all or I get a default gateway to a fe80::/10 
>>> link-local address.
>>> IIRC this worked before I changed the router to a L3 HA router.
>>>
>>> Appreciate any feedback!
>>>
>>> Best regards
>>> Tobias
>>
>

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