Public bug reported:
Hello!
I would like to report a possible bug.
We currently using Rocky with Ubuntu 18.04.
We use custom ansible for deployment.
We have a setup, where the upstream core Cisco nexus DC switches answers
to RA-s. This works fine with a network, which we had for years
(upgraded from kilo)
Now, we made a new region, with new network nodes, etc. and the IPv6 not
works as in the old region.
In the new region, we had this subnet:
[PROD][root(cc1:0)] <~> openstack subnet show Flat1-subnet-v6
+-------------------+------------------------------------------------------+
| Field | Value |
+-------------------+------------------------------------------------------+
| allocation_pools | 2001:738:0:527::2-2001:738:0:527:ffff:ffff:ffff:ffff |
| cidr | 2001:738:0:527::/64 |
| created_at | 2020-07-01T22:59:53Z |
| description | |
| dns_nameservers | |
| enable_dhcp | True |
| gateway_ip | 2001:738:0:527::1 |
| host_routes | |
| id | a5a9991c-62f3-4f46-b1ef-e293dc0fb781 |
| ip_version | 6 |
| ipv6_address_mode | slaac |
| ipv6_ra_mode | None |
| name | Flat1-subnet-v6 |
| network_id | fa55bfc7-ab42-4d97-987e-645cca7a0601 |
| project_id | b48a9319a66e45f3b04cc8bb70e3113c |
| revision_number | 0 |
| segment_id | None |
| service_types | |
| subnetpool_id | None |
| tags | |
| updated_at | 2020-07-01T22:59:53Z |
+-------------------+------------------------------------------------------+
As you can see, the address mode is SLAAC, the RA mode is: None.
Checking from network node, we see the qrouter:
[PROD][root(net1:0)] </home/ocadmin> ip netns exec
qrouter-4ffa4f55-95aa-4ce1-b4f8-8bbb2f9d53e1 ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group
default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
35: ha-5dfb8647-f7: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue
state UNKNOWN group default qlen 1000
link/ether fa:16:3e:1c:4d:8d brd ff:ff:ff:ff:ff:ff
inet 169.254.192.3/18 brd 169.254.255.255 scope global ha-5dfb8647-f7
valid_lft forever preferred_lft forever
inet 169.254.0.162/24 scope global ha-5dfb8647-f7
valid_lft forever preferred_lft forever
inet6 fe80::f816:3eff:fe1c:4d8d/64 scope link
valid_lft forever preferred_lft forever
36: qr-a6d7ceab-80: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
state UNKNOWN group default qlen 1000
link/ether fa:16:3e:a1:7e:69 brd ff:ff:ff:ff:ff:ff
inet 193.224.218.251/24 scope global qr-a6d7ceab-80
valid_lft forever preferred_lft forever
inet6 2001:738:0:527:f816:3eff:fea1:7e69/64 scope global nodad
valid_lft forever preferred_lft forever
inet6 fe80::f816:3eff:fea1:7e69/64 scope link nodad
valid_lft forever preferred_lft forever
If I check the running process on our net1 node, I got this:
[PROD][root(net1:0)] </home/ocadmin> ps aux |grep radvd |grep
4ffa4f55-95aa-4ce1-b4f8-8bbb2f9d53e1
neutron 32540 0.0 0.0 19604 2372 ? Ss júl02 0:05 radvd -C
/var/lib/neutron/ra/4ffa4f55-95aa-4ce1-b4f8-8bbb2f9d53e1.radvd.conf -p
/var/lib/neutron/external/pids/4ffa4f55-95aa-4ce1-b4f8-8bbb2f9d53e1.pid.radvd
-m syslog -u neutron
The specific radvd config:
[PROD][root(net1:0)] </home/ocadmin> cat
/var/lib/neutron/ra/4ffa4f55-95aa-4ce1-b4f8-8bbb2f9d53e1.radvd.conf
interface qr-a6d7ceab-80
{
AdvSendAdvert on;
MinRtrAdvInterval 30;
MaxRtrAdvInterval 100;
AdvLinkMTU 1500;
};
If I spin up an instance, I see this:
debian@test:~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group
default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP
group default qlen 1000
link/ether fa:16:3e:71:ca:8d brd ff:ff:ff:ff:ff:ff
inet 193.224.218.9/24 brd 193.224.218.255 scope global dynamic eth0
valid_lft 86353sec preferred_lft 86353sec
inet6 2001:738:0:527:f816:3eff:fe71:ca8d/64 scope global dynamic mngtmpaddr
valid_lft 2591994sec preferred_lft 604794sec
inet6 fe80::f816:3eff:fe71:ca8d/64 scope link
valid_lft forever preferred_lft forever
debian@test:~$ ip -6 route
::1 dev lo proto kernel metric 256 pref medium
2001:738:0:527::/64 dev eth0 proto kernel metric 256 expires 2591990sec pref
medium
fe80::/64 dev eth0 proto kernel metric 256 pref medium
default via fe80::f816:3eff:fea1:7e69 dev eth0 proto ra metric 1024 expires
251sec hoplimit 64 pref medium
default via fe80::5:73ff:fea0:2cf dev eth0 proto ra metric 1024 expires 1790sec
hoplimit 64 pref medium
As you can see, I'v got two default routes, where the upper one is not ment to
be there.
Could you point out something I missed, or there are some kind of bug,
which makes this?
Thanks:
Peter ERDOSI (Fazy)
** Affects: neutron
Importance: Undecided
Status: New
** Tags: ipv6 ra-mode
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https://bugs.launchpad.net/bugs/1888256
Title:
Neutron start radvd and mess up the routing table when:
ipv6_ra_mode=not set ipv6-address-mode=slaac
Status in neutron:
New
Bug description:
Hello!
I would like to report a possible bug.
We currently using Rocky with Ubuntu 18.04.
We use custom ansible for deployment.
We have a setup, where the upstream core Cisco nexus DC switches
answers to RA-s. This works fine with a network, which we had for
years (upgraded from kilo)
Now, we made a new region, with new network nodes, etc. and the IPv6
not works as in the old region.
In the new region, we had this subnet:
[PROD][root(cc1:0)] <~> openstack subnet show Flat1-subnet-v6
+-------------------+------------------------------------------------------+
| Field | Value |
+-------------------+------------------------------------------------------+
| allocation_pools | 2001:738:0:527::2-2001:738:0:527:ffff:ffff:ffff:ffff |
| cidr | 2001:738:0:527::/64 |
| created_at | 2020-07-01T22:59:53Z |
| description | |
| dns_nameservers | |
| enable_dhcp | True |
| gateway_ip | 2001:738:0:527::1 |
| host_routes | |
| id | a5a9991c-62f3-4f46-b1ef-e293dc0fb781 |
| ip_version | 6 |
| ipv6_address_mode | slaac |
| ipv6_ra_mode | None |
| name | Flat1-subnet-v6 |
| network_id | fa55bfc7-ab42-4d97-987e-645cca7a0601 |
| project_id | b48a9319a66e45f3b04cc8bb70e3113c |
| revision_number | 0 |
| segment_id | None |
| service_types | |
| subnetpool_id | None |
| tags | |
| updated_at | 2020-07-01T22:59:53Z |
+-------------------+------------------------------------------------------+
As you can see, the address mode is SLAAC, the RA mode is: None.
Checking from network node, we see the qrouter:
[PROD][root(net1:0)] </home/ocadmin> ip netns exec
qrouter-4ffa4f55-95aa-4ce1-b4f8-8bbb2f9d53e1 ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group
default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
35: ha-5dfb8647-f7: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue
state UNKNOWN group default qlen 1000
link/ether fa:16:3e:1c:4d:8d brd ff:ff:ff:ff:ff:ff
inet 169.254.192.3/18 brd 169.254.255.255 scope global ha-5dfb8647-f7
valid_lft forever preferred_lft forever
inet 169.254.0.162/24 scope global ha-5dfb8647-f7
valid_lft forever preferred_lft forever
inet6 fe80::f816:3eff:fe1c:4d8d/64 scope link
valid_lft forever preferred_lft forever
36: qr-a6d7ceab-80: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
state UNKNOWN group default qlen 1000
link/ether fa:16:3e:a1:7e:69 brd ff:ff:ff:ff:ff:ff
inet 193.224.218.251/24 scope global qr-a6d7ceab-80
valid_lft forever preferred_lft forever
inet6 2001:738:0:527:f816:3eff:fea1:7e69/64 scope global nodad
valid_lft forever preferred_lft forever
inet6 fe80::f816:3eff:fea1:7e69/64 scope link nodad
valid_lft forever preferred_lft forever
If I check the running process on our net1 node, I got this:
[PROD][root(net1:0)] </home/ocadmin> ps aux |grep radvd |grep
4ffa4f55-95aa-4ce1-b4f8-8bbb2f9d53e1
neutron 32540 0.0 0.0 19604 2372 ? Ss júl02 0:05 radvd -C
/var/lib/neutron/ra/4ffa4f55-95aa-4ce1-b4f8-8bbb2f9d53e1.radvd.conf -p
/var/lib/neutron/external/pids/4ffa4f55-95aa-4ce1-b4f8-8bbb2f9d53e1.pid.radvd
-m syslog -u neutron
The specific radvd config:
[PROD][root(net1:0)] </home/ocadmin> cat
/var/lib/neutron/ra/4ffa4f55-95aa-4ce1-b4f8-8bbb2f9d53e1.radvd.conf
interface qr-a6d7ceab-80
{
AdvSendAdvert on;
MinRtrAdvInterval 30;
MaxRtrAdvInterval 100;
AdvLinkMTU 1500;
};
If I spin up an instance, I see this:
debian@test:~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group
default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP
group default qlen 1000
link/ether fa:16:3e:71:ca:8d brd ff:ff:ff:ff:ff:ff
inet 193.224.218.9/24 brd 193.224.218.255 scope global dynamic eth0
valid_lft 86353sec preferred_lft 86353sec
inet6 2001:738:0:527:f816:3eff:fe71:ca8d/64 scope global dynamic
mngtmpaddr
valid_lft 2591994sec preferred_lft 604794sec
inet6 fe80::f816:3eff:fe71:ca8d/64 scope link
valid_lft forever preferred_lft forever
debian@test:~$ ip -6 route
::1 dev lo proto kernel metric 256 pref medium
2001:738:0:527::/64 dev eth0 proto kernel metric 256 expires 2591990sec pref
medium
fe80::/64 dev eth0 proto kernel metric 256 pref medium
default via fe80::f816:3eff:fea1:7e69 dev eth0 proto ra metric 1024 expires
251sec hoplimit 64 pref medium
default via fe80::5:73ff:fea0:2cf dev eth0 proto ra metric 1024 expires
1790sec hoplimit 64 pref medium
As you can see, I'v got two default routes, where the upper one is not ment
to be there.
Could you point out something I missed, or there are some kind of bug,
which makes this?
Thanks:
Peter ERDOSI (Fazy)
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