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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