Thanks for your help: [root@podto2-osctrl01 ~]# neutron net-list neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead. +--------------------------------------+----------------------------------------------------+----------------------------------+--------------------------------------------------------+ | id | name | tenant_id | subnets | +--------------------------------------+----------------------------------------------------+----------------------------------+--------------------------------------------------------+ | 00361d96-0ea2-4378-8909-dbf7ef4c883f | NVLP2-Provider-backoffice1 | 85cace94dcc7484c85ff9337eb1d0c4c | 9ba2a03d-3f95-494f-bd38-7fe85471465d 10.138.179.0/24 | | 28ac0a79-17a9-46f5-a418-77f386b821b5 | NVLP2-Provider-Bk | 85cace94dcc7484c85ff9337eb1d0c4c | 0705b470-ce99-46c8-944c-cfbfc6a2a5f7 10.138.177.0/24 | | 2e3edf38-7648-4ac8-a8d7-11448adedcca | NVLP2-Ext-Internet | 85cace94dcc7484c85ff9337eb1d0c4c | ff797a1f-7de4-4998-9bdc-29d1241ffb5b 84.240.191.0/24 | | 34a3e80d-a662-4665-ad6f-a7a83e2be346 | NVLP2-Ext-Rupar | 85cace94dcc7484c85ff9337eb1d0c4c | 1a88e004-7062-4702-8965-b18ea9d6af87 10.138.181.0/24 | | 435e5609-c91a-4e42-bd1a-87dbc24e4afa | HA network tenant 85cace94dcc7484c85ff9337eb1d0c4c | | 5bbb31c3-a2cd-4e30-a194-60cee122d0e9 169.254.192.0/18 | | 7f41aa95-b108-4224-9088-21e32d554646 | admin-self-net | 85cace94dcc7484c85ff9337eb1d0c4c | 272ca9b5-2aa0-45d2-90b4-70abe4feac49 192.168.90.0/24 | | | | | ea1c69b8-ded6-4028-bba9-63db12213e36 192.168.100.0/24 | | 8b876fb6-10a3-4e92-a499-f62a9d3aa32b | net-vx4-private | 4e44aad117b64a34806c4785b31c3f88 | dcd2ad5c-afb5-420b-bfa8-7b89ab511f5b 192.168.213.0/24 | | 993f14c9-1b40-47b7-8ee5-fcb00ef92d48 | HA network tenant 4e44aad117b64a34806c4785b31c3f88 | | d2129401-0349-4da3-87fa-5e521b071377 169.254.192.0/18 | | a91bb860-32d6-4961-a319-bf39a492ff92 | NVL-INTERPOD-VNI-PRIV | 85cace94dcc7484c85ff9337eb1d0c4c | 7b8987f7-da16-48c0-b86c-f3c4fd507f22 10.138.240.48/28 | | | | | a855f85b-46b7-4463-993b-8d867fb38556 10.138.240.0/28 | | b11bd55d-c57b-48d1-9be4-ab690624fb76 | NVLP2-Prov-WEB | 85cace94dcc7484c85ff9337eb1d0c4c | 5f369cf5-8b26-4996-97d5-24434f928a84 10.138.236.32/27 | | | | | adbe60f2-e02b-4294-8eb8-18ffb0b8bcda 10.138.168.0/21 | | | | | ae1386b4-c6bc-4c69-909a-1e902df3bc3f 10.138.232.0/27 | | | | | aefeeb08-7fb8-43c7-adc8-e8b0538b57d9 10.138.236.128/27 | | | | | b22247e8-fa4a-48bd-8a3f-dde5f22ee866 10.138.236.0/27 | | | | | d3e834ef-5f7c-43b7-b52d-fd8e223e6c50 10.138.232.128/27 | | | | | d87341b3-f953-4a93-bcaf-46524fbb3408 10.138.236.96/27 | | | | | de2c0bc9-85d4-4e5b-b1ae-d39ae6bbc6ee 10.138.200.0/21 | | | | | e0a4ce65-9d39-496d-960c-88272cafad55 10.138.236.64/27 | | | | | ee1bfd8b-231d-4e1d-83c8-d8d66346acef 10.138.232.32/27 | | | | | efd1f72c-8bd3-4b25-a3fc-e2698dd734d7 10.138.136.0/21 | | | | | f4b9f50b-18e9-49b2-b0db-6a51cf968e95 10.138.232.64/27 | | | | | f986c4b1-1efc-4973-87a8-74db536ac1c0 10.138.232.96/27 | | b250fb4e-5d36-4aa6-bcfb-c623166312ca | net-vx1-private | 85cace94dcc7484c85ff9337eb1d0c4c | e0e82224-93e1-4369-b9c1-7d0ac1614837 192.168.213.0/24 | | c767ef08-c1fb-45ed-bf1e-a4c464e12b93 | private-net | 85cace94dcc7484c85ff9337eb1d0c4c | fb8ec92c-afa6-48f1-b7f8-25e77462b28b 192.192.100.0/24 | | cd8a928b-42ae-4673-ae19-c687cfd181d4 | NVLP2-Prov-BE | 85cace94dcc7484c85ff9337eb1d0c4c | 37b2ba42-6158-4a5f-96f0-48e476b4cd45 10.138.160.0/21 | | | | | 8502138b-c2c0-4436-bec5-9221a36e0c8c 10.138.192.0/21 | | | | | ceabf390-6489-4b5d-a5b9-305176def3a1 10.138.128.0/21 | | dede00bb-bc23-40a8-a3b9-b273eb7533ff | NVLP2-Prov-WEB2-test-2-network | e28e45dbbb3e4471a8fb6dd6cb99d01d | 92da59f1-df82-470b-a2ea-9b9b6f6c8e5e 10.138.185.112/28 | | | | | b8668626-8c05-4c7d-a70b-a1485f0d666e 10.138.217.112/28 | +--------------------------------------+----------------------------------------------------+----------------------------------+--------------------------------------------------------+ [root@podto2-osctrl01 ~]# neutron subnet-list neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead. +--------------------------------------+---------------------------------------------------+----------------------------------+-------------------+--------------------------------------------------------+ | id | name | tenant_id | cidr | allocation_pools | +--------------------------------------+---------------------------------------------------+----------------------------------+-------------------+--------------------------------------------------------+ | 0705b470-ce99-46c8-944c-cfbfc6a2a5f7 | NVLP2-Provider-Bk-subnet | 85cace94dcc7484c85ff9337eb1d0c4c | 10.138.177.0/24 | {"start": "10.138.177.70", "end": "10.138.177.100"} | | 1a88e004-7062-4702-8965-b18ea9d6af87 | NVLP2-Ext-Rupar-subnet | 85cace94dcc7484c85ff9337eb1d0c4c | 10.138.181.0/24 | {"start": "10.138.181.20", "end": "10.138.181.150"} | | 272ca9b5-2aa0-45d2-90b4-70abe4feac49 | admin-self-subnet2 | 85cace94dcc7484c85ff9337eb1d0c4c | 192.168.90.0/24 | {"start": "192.168.90.10", "end": "192.168.90.254"} | | 37b2ba42-6158-4a5f-96f0-48e476b4cd45 | NVLP2-Prov-BE-subnet | 85cace94dcc7484c85ff9337eb1d0c4c | 10.138.160.0/21 | {"start": "10.138.160.20", "end": "10.138.164.255"} | | 5bbb31c3-a2cd-4e30-a194-60cee122d0e9 | HA subnet tenant 85cace94dcc7484c85ff9337eb1d0c4c | | 169.254.192.0/18 | {"start": "169.254.192.1", "end": "169.254.255.254"} | | 5f369cf5-8b26-4996-97d5-24434f928a84 | NVLP2-Prov-Rupar02-2-0cf8fe671a-subnet | e28e45dbbb3e4471a8fb6dd6cb99d01d | 10.138.236.32/27 | {"start": "10.138.236.35", "end": "10.138.236.47"} | | 7b8987f7-da16-48c0-b86c-f3c4fd507f22 | NVLP2-Interpod-subnet-x4 | 85cace94dcc7484c85ff9337eb1d0c4c | 10.138.240.48/28 | {"start": "10.138.240.61", "end": "10.138.240.61"} | | 8502138b-c2c0-4436-bec5-9221a36e0c8c | NVLP2-Prov-BE-subnet-78bc7d0889 | e8c2a22432174638bdee830274845c38 | 10.138.192.0/21 | {"start": "10.138.192.20", "end": "10.138.196.255"} | | 92da59f1-df82-470b-a2ea-9b9b6f6c8e5e | NVLP2-Prov-WEB2-test-2-284f32dbb8-subnet | e28e45dbbb3e4471a8fb6dd6cb99d01d | 10.138.185.112/28 | {"start": "10.138.185.114", "end": "10.138.185.119"} | | 9ba2a03d-3f95-494f-bd38-7fe85471465d | NVLP2-Provider-backoffice1-subnet | 85cace94dcc7484c85ff9337eb1d0c4c | 10.138.179.0/24 | {"start": "10.138.179.20", "end": "10.138.179.150"} | | a855f85b-46b7-4463-993b-8d867fb38556 | NVLP2-Interpod-subnet-x1 | 85cace94dcc7484c85ff9337eb1d0c4c | 10.138.240.0/28 | {"start": "10.138.240.13", "end": "10.138.240.14"} | | adbe60f2-e02b-4294-8eb8-18ffb0b8bcda | NVLP2-Prov-WEB-subnet | 85cace94dcc7484c85ff9337eb1d0c4c | 10.138.168.0/21 | {"start": "10.138.168.20", "end": "10.138.172.255"} | | ae1386b4-c6bc-4c69-909a-1e902df3bc3f | NVLP2-Prov-Rupar01-2-d0f1fa90f7-subnet | e28e45dbbb3e4471a8fb6dd6cb99d01d | 10.138.232.0/27 | {"start": "10.138.232.3", "end": "10.138.232.15"} | | aefeeb08-7fb8-43c7-adc8-e8b0538b57d9 | NVLP2-Prov-Rupar05-2-93db411f87-subnet | e28e45dbbb3e4471a8fb6dd6cb99d01d | 10.138.236.128/27 | {"start": "10.138.236.131", "end": "10.138.236.143"} | | b22247e8-fa4a-48bd-8a3f-dde5f22ee866 | NVLP2-Prov-Rupar01-2-6e53be6e00-subnet | e28e45dbbb3e4471a8fb6dd6cb99d01d | 10.138.236.0/27 | {"start": "10.138.236.3", "end": "10.138.236.15"} | | b8668626-8c05-4c7d-a70b-a1485f0d666e | NVLP2-Prov-WEB2-test-2-dbe7f3376f-subnet | e28e45dbbb3e4471a8fb6dd6cb99d01d | 10.138.217.112/28 | {"start": "10.138.217.114", "end": "10.138.217.119"} | | ceabf390-6489-4b5d-a5b9-305176def3a1 | NVLP2-Prov-BE-subnet-42bda158af | e8c2a22432174638bdee830274845c38 | 10.138.128.0/21 | {"start": "10.138.128.20", "end": "10.138.132.255"} | | d2129401-0349-4da3-87fa-5e521b071377 | HA subnet tenant 4e44aad117b64a34806c4785b31c3f88 | | 169.254.192.0/18 | {"start": "169.254.192.1", "end": "169.254.255.254"} | | d3e834ef-5f7c-43b7-b52d-fd8e223e6c50 | NVLP2-Prov-Rupar05-2-97e7a2473d-subnet | e28e45dbbb3e4471a8fb6dd6cb99d01d | 10.138.232.128/27 | {"start": "10.138.232.131", "end": "10.138.232.143"} | | d87341b3-f953-4a93-bcaf-46524fbb3408 | NVLP2-Prov-Rupar04-2-a8223d4e2e-subnet | e28e45dbbb3e4471a8fb6dd6cb99d01d | 10.138.236.96/27 | {"start": "10.138.236.99", "end": "10.138.236.111"} | | dcd2ad5c-afb5-420b-bfa8-7b89ab511f5b | sub-vx4 | 4e44aad117b64a34806c4785b31c3f88 | 192.168.213.0/24 | {"start": "192.168.213.100", "end": "192.168.213.200"} | | de2c0bc9-85d4-4e5b-b1ae-d39ae6bbc6ee | NVLP2-Prov-WEB-subnet-ae476243c2 | e8c2a22432174638bdee830274845c38 | 10.138.200.0/21 | {"start": "10.138.200.20", "end": "10.138.204.255"} | | e0a4ce65-9d39-496d-960c-88272cafad55 | NVLP2-Prov-Rupar03-2-3c7a3850d1-subnet | e28e45dbbb3e4471a8fb6dd6cb99d01d | 10.138.236.64/27 | {"start": "10.138.236.67", "end": "10.138.236.79"} | | e0e82224-93e1-4369-b9c1-7d0ac1614837 | sub-vx1 | 85cace94dcc7484c85ff9337eb1d0c4c | 192.168.213.0/24 | {"start": "192.168.213.100", "end": "192.168.213.200"} | | ea1c69b8-ded6-4028-bba9-63db12213e36 | admin-self-subnet1 | 85cace94dcc7484c85ff9337eb1d0c4c | 192.168.100.0/24 | {"start": "192.168.100.2", "end": "192.168.100.254"} | | ee1bfd8b-231d-4e1d-83c8-d8d66346acef | NVLP2-Prov-Rupar02-2-ecfee60675-subnet | e28e45dbbb3e4471a8fb6dd6cb99d01d | 10.138.232.32/27 | {"start": "10.138.232.35", "end": "10.138.232.47"} | | efd1f72c-8bd3-4b25-a3fc-e2698dd734d7 | NVLP2-Prov-WEB-subnet-e7e65a3ed6 | e8c2a22432174638bdee830274845c38 | 10.138.136.0/21 | {"start": "10.138.136.20", "end": "10.138.140.255"} | | f4b9f50b-18e9-49b2-b0db-6a51cf968e95 | NVLP2-Prov-Rupar03-2-40976657fe-subnet | e28e45dbbb3e4471a8fb6dd6cb99d01d | 10.138.232.64/27 | {"start": "10.138.232.67", "end": "10.138.232.79"} | | f986c4b1-1efc-4973-87a8-74db536ac1c0 | NVLP2-Prov-Rupar04-2-729355c12e-subnet | e28e45dbbb3e4471a8fb6dd6cb99d01d | 10.138.232.96/27 | {"start": "10.138.232.99", "end": "10.138.232.111"} | | fb8ec92c-afa6-48f1-b7f8-25e77462b28b | provate-subnet | 85cace94dcc7484c85ff9337eb1d0c4c | 192.192.100.0/24 | {"start": "192.192.100.2", "end": "192.192.100.254"} | | ff797a1f-7de4-4998-9bdc-29d1241ffb5b | NVLP2-Ext-Internet-subnet | 85cace94dcc7484c85ff9337eb1d0c4c | 84.240.191.0/24 | {"start": "84.240.191.2", "end": "84.240.191.170"} | +--------------------------------------+---------------------------------------------------+----------------------------------+-------------------+--------------------------------------------------------+ [root@podto2-osctrl01 ~]# neutron subnet-show NVLP2-Prov-Rupar04-2-729355c12e-subnet neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead. +-------------------+-----------------------------------------------------------------+ | Field | Value | +-------------------+-----------------------------------------------------------------+ | allocation_pools | {"start": "10.138.232.99", "end": "10.138.232.111"} | | cidr | 10.138.232.96/27 | | created_at | 2019-11-29T08:14:32Z | | description | | | dns_nameservers | 10.103.48.1 | | | 10.103.48.2 | | enable_dhcp | True | | gateway_ip | 10.138.232.97 | | host_routes | {"nexthop": "10.138.232.97", "destination": "0.0.0.0/0"} | | | {"nexthop": "10.138.232.97", "destination": " 10.138.236.96/27"} | | id | f986c4b1-1efc-4973-87a8-74db536ac1c0 | | ip_version | 4 | | ipv6_address_mode | | | ipv6_ra_mode | | | name | NVLP2-Prov-Rupar04-2-729355c12e-subnet | | network_id | b11bd55d-c57b-48d1-9be4-ab690624fb76 | | project_id | e28e45dbbb3e4471a8fb6dd6cb99d01d | | revision_number | 4 | | service_types | | | subnetpool_id | | | tags | | | tenant_id | e28e45dbbb3e4471a8fb6dd6cb99d01d | | updated_at | 2019-12-10T13:43:02Z | If I create an instance on this subnet , it gets an address in the allocation-pool correctly, but the default gateway is not 10.138.232.97, but 10.138.232.65. This is a gatway of another subnet in the same vlan: [root@podto2-osctrl01 ~]# neutron subnet-show NVLP2-Prov-Rupar03-2-40976657fe-subnet neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead. +-------------------+-----------------------------------------------------------------+ | Field | Value | +-------------------+-----------------------------------------------------------------+ | allocation_pools | {"start": "10.138.232.67", "end": "10.138.232.79"} | | cidr | 10.138.232.64/27 | | created_at | 2019-11-29T08:13:14Z | | description | | | dns_nameservers | 10.103.48.1 | | | 10.103.48.2 | | enable_dhcp | True | | gateway_ip | 10.138.232.65 | | host_routes | {"nexthop": "10.138.232.65", "destination": " 10.138.236.64/27"} | | id | f4b9f50b-18e9-49b2-b0db-6a51cf968e95 | | ip_version | 4 | | ipv6_address_mode | | | ipv6_ra_mode | | | name | NVLP2-Prov-Rupar03-2-40976657fe-subnet | | network_id | b11bd55d-c57b-48d1-9be4-ab690624fb76 | | project_id | e28e45dbbb3e4471a8fb6dd6cb99d01d | | revision_number | 4 | | service_types | | | subnetpool_id | | | tags | | | tenant_id | e28e45dbbb3e4471a8fb6dd6cb99d01d | | updated_at | 2019-12-11T08:27:20Z | +-------------------+-----------------------------------------------------------------+ The following is the dnsmasq process: [root@podto2-osctrl01 ~]# ps -afe|grep dns|grep b76 nobody 70093 1 0 dic02 ? 00:00:04 dnsmasq --no-hosts --no-resolv --pid-file=/var/lib/neutron/dhcp/b11bd55d-c57b-48d1-9be4-ab690624fb76/pid --dhcp-hostsfile=/var/lib/neutron/dhcp/b11bd55d-c57b-48d1-9be4-ab690624fb76/host --addn-hosts=/var/lib/neutron/dhcp/b11bd55d-c57b-48d1-9be4-ab690624fb76/addn_hosts --dhcp-optsfile=/var/lib/neutron/dhcp/b11bd55d-c57b-48d1-9be4-ab690624fb76/opts --dhcp-leasefile=/var/lib/neutron/dhcp/b11bd55d-c57b-48d1-9be4-ab690624fb76/leases --dhcp-match=set:ipxe,175 --local-service --bind-interfaces --dhcp-range=set:tag1,10.138.168.0,static,255.255.248.0,86400s --dhcp-range=set:tag2,10.138.232.0,static,255.255.255.224,86400s --dhcp-range=set:tag4,10.138.232.128,static,255.255.255.224,86400s --dhcp-range=set:tag8,10.138.232.32,static,255.255.255.224,86400s --dhcp-range=set:tag10,10.138.232.64,static,255.255.255.224,86400s --dhcp-range=set:tag11,10.138.232.96,static,255.255.255.224,86400s --dhcp-option-force=option:mtu,9000 --dhcp-lease-max=2208 --conf-file= --domain=site02.nivolapiemonte.it Ignazio Il giorno mer 11 dic 2019 alle ore 09:19 Slawek Kaplonski < skaplons@redhat.com> ha scritto:

Hi,

Can You maybe give us some more details? Like how exactly this network and subnets looks like (neutron net-show and neutron subnet-show), and please also check dnsmasq config files - those are located on node where DHCP agent is running. If You will do something like:

ps aux | grep <network_id>

You will find dnsmasq process for this network.

...

On 10 Dec 2019, at 16:52, Ignazio Cassano <ignaziocassano@gmail.com> wrote:

Hello Everyone, I have an openstack queens installation based on centos 7. I created a shared vlan network and multiple subnet under it. When I start an instance on one of the subnet network it gets the correct ip based on its subnet but the gateway seems random (one of the subnet of the vlan).

Any suggestion, please ?

Ignazio

— Slawek Kaplonski Senior software engineer Red Hat