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[Bug 1501969] [NEW] Instance does not get IP from dhcp ipv6 subnet (slaac/slaac) with DVR, when router interface is added after VM creation.

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Ritesh Anand <ritesh.anand@xxxxxx>
Date: Fri, 02 Oct 2015 00:57:23 -0000
Reply-to: Bug 1501969 <1501969@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

Instance does not get IP from dhcp ipv6 subnet (slaac/slaac) with DVR,
when router interface is added after VM creation.

Instance does get IP when it is booted after interface to the subnet  has already been added to the DVR.
This ordering issue is not observed with centralized router.

Easy to recreate.

On compute:
----------------------

NOT getting IP, when router interface is added after VM has been created:
$ ifconfig
eth0      Link encap:Ethernet  HWaddr FA:16:3E:9C:15:B7
          inet6 addr: fe80::f816:3eff:fe9c:15b7/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:14 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1116 (1.0 KiB)  TX bytes:1138 (1.1 KiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:12 errors:0 dropped:0 overruns:0 frame:0
          TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1020 (1020.0 B)  TX bytes:1020 (1020.0 B)

Gets IP when router interface is added before VM is booted.
$
$ ifconfig
eth0      Link encap:Ethernet  HWaddr FA:16:3E:9C:15:B7
          inet6 addr: 4001:db8::f816:3eff:fe9c:15b7/64 Scope:Global
          inet6 addr: fe80::f816:3eff:fe9c:15b7/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:15 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1226 (1.1 KiB)  TX bytes:1138 (1.1 KiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:12 errors:0 dropped:0 overruns:0 frame:0
          TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1020 (1020.0 B)  TX bytes:1020 (1020.0 B)

$

Subnet:
stack@osctrlr:~/devstack$ neutron subnet-show ipv62s1
+-------------------+------------------------------------------------------------------+
| Field             | Value                                                            |
+-------------------+------------------------------------------------------------------+
| allocation_pools  | {"start": "4001:db8::2", "end": "4001:db8::ffff:ffff:ffff:ffff"} |
| cidr              | 4001:db8::/64                                                    |
| dns_nameservers   |                                                                  |
| enable_dhcp       | True                                                             |
| gateway_ip        | 4001:db8::1                                                      |
| host_routes       |                                                                  |
| id                | 2b24b126-f618-4daa-a3a8-24ea8720a0db                             |
| ip_version        | 6                                                                |
| ipv6_address_mode | slaac                                                            |
| ipv6_ra_mode      | slaac                                                            |
| name              | ipv62s1                                                          |
| network_id        | d9a71eed-0768-46b7-be0e-74664211f28b                             |
| subnetpool_id     |                                                                  |
| tenant_id         | 9fbdd2326fe34e949ece2bef8c8f8c8c                                 |
+-------------------+------------------------------------------------------------------+
stack@osctrlr:~/devstack$

Router:
stack@osctrlr:~/devstack$ neutron router-show dvr
+-----------------------+--------------------------------------+
| Field                 | Value                                |
+-----------------------+--------------------------------------+
| admin_state_up        | True                                 |
| distributed           | True                                 |
| external_gateway_info |                                      |
| ha                    | False                                |
| id                    | 3512b48b-a1a8-4923-9a4b-0720dfd71baf |
| name                  | dvr                                  |
| routes                |                                      |
| status                | ACTIVE                               |
| tenant_id             | 9fbdd2326fe34e949ece2bef8c8f8c8c     |
+-----------------------+--------------------------------------+
stack@osctrlr:~/devstack$

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1501969

Title:
  Instance does not get IP from dhcp ipv6 subnet (slaac/slaac) with DVR,
  when router interface is added after VM creation.

Status in neutron:
  New

Bug description:
  Instance does not get IP from dhcp ipv6 subnet (slaac/slaac) with DVR,
  when router interface is added after VM creation.

  Instance does get IP when it is booted after interface to the subnet  has already been added to the DVR.
  This ordering issue is not observed with centralized router.

  Easy to recreate.

  On compute:
  ----------------------

  NOT getting IP, when router interface is added after VM has been created:
  $ ifconfig
  eth0      Link encap:Ethernet  HWaddr FA:16:3E:9C:15:B7
            inet6 addr: fe80::f816:3eff:fe9c:15b7/64 Scope:Link
            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
            RX packets:14 errors:0 dropped:0 overruns:0 frame:0
            TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:1000
            RX bytes:1116 (1.0 KiB)  TX bytes:1138 (1.1 KiB)

  lo        Link encap:Local Loopback
            inet addr:127.0.0.1  Mask:255.0.0.0
            inet6 addr: ::1/128 Scope:Host
            UP LOOPBACK RUNNING  MTU:16436  Metric:1
            RX packets:12 errors:0 dropped:0 overruns:0 frame:0
            TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:0
            RX bytes:1020 (1020.0 B)  TX bytes:1020 (1020.0 B)

  Gets IP when router interface is added before VM is booted.
  $
  $ ifconfig
  eth0      Link encap:Ethernet  HWaddr FA:16:3E:9C:15:B7
            inet6 addr: 4001:db8::f816:3eff:fe9c:15b7/64 Scope:Global
            inet6 addr: fe80::f816:3eff:fe9c:15b7/64 Scope:Link
            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
            RX packets:15 errors:0 dropped:0 overruns:0 frame:0
            TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:1000
            RX bytes:1226 (1.1 KiB)  TX bytes:1138 (1.1 KiB)

  lo        Link encap:Local Loopback
            inet addr:127.0.0.1  Mask:255.0.0.0
            inet6 addr: ::1/128 Scope:Host
            UP LOOPBACK RUNNING  MTU:16436  Metric:1
            RX packets:12 errors:0 dropped:0 overruns:0 frame:0
            TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:0
            RX bytes:1020 (1020.0 B)  TX bytes:1020 (1020.0 B)

  $

  Subnet:
  stack@osctrlr:~/devstack$ neutron subnet-show ipv62s1
  +-------------------+------------------------------------------------------------------+
  | Field             | Value                                                            |
  +-------------------+------------------------------------------------------------------+
  | allocation_pools  | {"start": "4001:db8::2", "end": "4001:db8::ffff:ffff:ffff:ffff"} |
  | cidr              | 4001:db8::/64                                                    |
  | dns_nameservers   |                                                                  |
  | enable_dhcp       | True                                                             |
  | gateway_ip        | 4001:db8::1                                                      |
  | host_routes       |                                                                  |
  | id                | 2b24b126-f618-4daa-a3a8-24ea8720a0db                             |
  | ip_version        | 6                                                                |
  | ipv6_address_mode | slaac                                                            |
  | ipv6_ra_mode      | slaac                                                            |
  | name              | ipv62s1                                                          |
  | network_id        | d9a71eed-0768-46b7-be0e-74664211f28b                             |
  | subnetpool_id     |                                                                  |
  | tenant_id         | 9fbdd2326fe34e949ece2bef8c8f8c8c                                 |
  +-------------------+------------------------------------------------------------------+
  stack@osctrlr:~/devstack$

  Router:
  stack@osctrlr:~/devstack$ neutron router-show dvr
  +-----------------------+--------------------------------------+
  | Field                 | Value                                |
  +-----------------------+--------------------------------------+
  | admin_state_up        | True                                 |
  | distributed           | True                                 |
  | external_gateway_info |                                      |
  | ha                    | False                                |
  | id                    | 3512b48b-a1a8-4923-9a4b-0720dfd71baf |
  | name                  | dvr                                  |
  | routes                |                                      |
  | status                | ACTIVE                               |
  | tenant_id             | 9fbdd2326fe34e949ece2bef8c8f8c8c     |
  +-----------------------+--------------------------------------+
  stack@osctrlr:~/devstack$

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Follow ups

[Bug 1501969] Re: No dhcp IPv6 assigned (slaac/slaac) with interface-add after VM boot
From: Doug Hellmann, 2015-12-03