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Message #47894
[Bug 1556074] [NEW] Adding physical provider network interface to router casues VM's to loose connectivity to provider network
Public bug reported:
Description:
- Created physical provider network "phy-provider" with subnet
192.168.0.0/16 GW: 192.168.0.4
$ neutron subnet-show 3b1de861-6324-4dac-9c7d-382065280505
+-------------------------------+-----------------------------------------------------------------------------+
| Field | Value |
+------------------------------+------------------------------------------------------------------------------+
| allocation_pools | {"start": "192.168.0.11", "end": "192.168.121.255"} |
| | {"start": "192.168.123.1", "end": "192.168.255.254"} |
| cidr | 192.168.0.0/16 |
| dns_nameservers | |
| enable_dhcp | True |
| gateway_ip | 192.168.0.4 |
| host_routes | |
| id | 3b1de861-6324-4dac-9c7d-382065280505 |
| ip_version | 4 |
| ipv6_address_mode | |
| ipv6_ra_mode | |
| name | provider-subnet192 |
| network_id | 84f54ac6-0c69-4ca1-aef0-fed4d856a6b1 |
| subnetpool_id | |
| tenant_id | d6f7a5e8d626495e9bc470da5bf63c8d |
+-------------------+-----------------------------------------------------------------------------------------+
- On VM's having provider network interface
$ ifconfig eth0
eth0 Link encap:Ethernet HWaddr FA:16:3E:2A:38:A7
inet addr:192.168.0.121 Bcast:192.168.255.255 Mask:255.255.0.0
inet6 addr: fe80::f816:3eff:fe2a:38a7/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:5984294 errors:0 dropped:0 overruns:0 frame:0
TX packets:1156 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:368453518 (351.3 MiB) TX bytes:112710 (110.0 KiB)
$ ping 192.168.0.114
PING 192.168.0.114 (192.168.0.114): 56 data bytes
64 bytes from 192.168.0.114: seq=0 ttl=64 time=1.329 ms
64 bytes from 192.168.0.114: seq=1 ttl=64 time=0.597 ms
64 bytes from 192.168.0.114: seq=2 ttl=64 time=0.490 ms
$ ping google.com
PING google.com (216.58.218.110): 56 data bytes
64 bytes from 216.58.218.110: seq=0 ttl=57 time=1.568 ms
64 bytes from 216.58.218.110: seq=1 ttl=57 time=1.619 ms
64 bytes from 216.58.218.110: seq=2 ttl=57 time=1.616 ms
64 bytes from 216.58.218.110: seq=3 ttl=57 time=1.623 ms
- Add provider network interface to router
$ neutron router-interface-add abc_prov 3b1de861-6324-4dac-9c7d-382065280505
Added interface b8a8d553-059a-4261-976a-281e4f1758ea to router abc_prov.
Observation:
VM looses connectivity to internet.
$ ping google.com
^C
$
Root cause:
When we add the provider network interface to router, neutron assigns provider network gateway IP to router interface. This stalls the VMs communication with the already existing provider network gateway.
$ neutron router-port-list abc_prov
+--------------------------------------+------+-------------------+------------------------------------------------------------------------------------+
| id | name | mac_address | fixed_ips |
+--------------------------------------+------+-------------------+------------------------------------------------------------------------------------+
| b8a8d553-059a-4261-976a-281e4f1758ea | | fa:16:3e:1e:b7:8c | {"subnet_id": "3b1de861-6324-4dac-9c7d-382065280505", "ip_address": "192.168.0.4"} |
+--------------------------------------+------+-------------------+------------------------------------------------------------------------------------+
Expected Output:
Since provider network is attributed with "physical_network", add router interface to this network should return error with code 403 - forbidden
Setup Description / Version-
OpenStack Neutron with OVN Plugin
neutron-server version 8.0.0
networking-ovn latest stable release
** Affects: neutron
Importance: Undecided
Assignee: Piyush Raman Srivastava (pirsriva)
Status: New
** Changed in: neutron
Assignee: (unassigned) => Piyush Raman Srivastava (pirsriva)
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https://bugs.launchpad.net/bugs/1556074
Title:
Adding physical provider network interface to router casues VM's to
loose connectivity to provider network
Status in neutron:
New
Bug description:
Description:
- Created physical provider network "phy-provider" with subnet
192.168.0.0/16 GW: 192.168.0.4
$ neutron subnet-show 3b1de861-6324-4dac-9c7d-382065280505
+-------------------------------+-----------------------------------------------------------------------------+
| Field | Value |
+------------------------------+------------------------------------------------------------------------------+
| allocation_pools | {"start": "192.168.0.11", "end": "192.168.121.255"} |
| | {"start": "192.168.123.1", "end": "192.168.255.254"} |
| cidr | 192.168.0.0/16 |
| dns_nameservers | |
| enable_dhcp | True |
| gateway_ip | 192.168.0.4 |
| host_routes | |
| id | 3b1de861-6324-4dac-9c7d-382065280505 |
| ip_version | 4 |
| ipv6_address_mode | |
| ipv6_ra_mode | |
| name | provider-subnet192 |
| network_id | 84f54ac6-0c69-4ca1-aef0-fed4d856a6b1 |
| subnetpool_id | |
| tenant_id | d6f7a5e8d626495e9bc470da5bf63c8d |
+-------------------+-----------------------------------------------------------------------------------------+
- On VM's having provider network interface
$ ifconfig eth0
eth0 Link encap:Ethernet HWaddr FA:16:3E:2A:38:A7
inet addr:192.168.0.121 Bcast:192.168.255.255 Mask:255.255.0.0
inet6 addr: fe80::f816:3eff:fe2a:38a7/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:5984294 errors:0 dropped:0 overruns:0 frame:0
TX packets:1156 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:368453518 (351.3 MiB) TX bytes:112710 (110.0 KiB)
$ ping 192.168.0.114
PING 192.168.0.114 (192.168.0.114): 56 data bytes
64 bytes from 192.168.0.114: seq=0 ttl=64 time=1.329 ms
64 bytes from 192.168.0.114: seq=1 ttl=64 time=0.597 ms
64 bytes from 192.168.0.114: seq=2 ttl=64 time=0.490 ms
$ ping google.com
PING google.com (216.58.218.110): 56 data bytes
64 bytes from 216.58.218.110: seq=0 ttl=57 time=1.568 ms
64 bytes from 216.58.218.110: seq=1 ttl=57 time=1.619 ms
64 bytes from 216.58.218.110: seq=2 ttl=57 time=1.616 ms
64 bytes from 216.58.218.110: seq=3 ttl=57 time=1.623 ms
- Add provider network interface to router
$ neutron router-interface-add abc_prov 3b1de861-6324-4dac-9c7d-382065280505
Added interface b8a8d553-059a-4261-976a-281e4f1758ea to router abc_prov.
Observation:
VM looses connectivity to internet.
$ ping google.com
^C
$
Root cause:
When we add the provider network interface to router, neutron assigns provider network gateway IP to router interface. This stalls the VMs communication with the already existing provider network gateway.
$ neutron router-port-list abc_prov
+--------------------------------------+------+-------------------+------------------------------------------------------------------------------------+
| id | name | mac_address | fixed_ips |
+--------------------------------------+------+-------------------+------------------------------------------------------------------------------------+
| b8a8d553-059a-4261-976a-281e4f1758ea | | fa:16:3e:1e:b7:8c | {"subnet_id": "3b1de861-6324-4dac-9c7d-382065280505", "ip_address": "192.168.0.4"} |
+--------------------------------------+------+-------------------+------------------------------------------------------------------------------------+
Expected Output:
Since provider network is attributed with "physical_network", add router interface to this network should return error with code 403 - forbidden
Setup Description / Version-
OpenStack Neutron with OVN Plugin
neutron-server version 8.0.0
networking-ovn latest stable release
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