** Also affects: neutron/juno
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1447883
Title:
Restrict netmask of CIDR to avoid DHCP resync is not enough
Status in neutron:
Fix Released
Status in neutron icehouse series:
Fix Released
Status in neutron juno series:
New
Status in neutron kilo series:
Fix Released
Status in OpenStack Security Advisory:
Won't Fix
Bug description:
Restrict netmask of CIDR to avoid DHCP resync is not enough.
https://bugs.launchpad.net/neutron/+bug/1443798
I'd like to prevent following case:
[Condition]
- Plugin: ML2
- subnet with "enable_dhcp" is True
[Operations]
A. Specify "[]"(empty list) at "allocation_pools" when create/update-subnet
---------------------------------------------------------------------------
$ $ curl -X POST -d '{"subnet": {"name": "test_subnet", "cidr":
"192.168.200.0/24", "ip_version": 4, "network_id":
"649c5531-338e-42b5-a2d1-4d49140deb02", "allocation_pools": []}}' -H
"x-auth-token:$TOKEN" -H "content-type:application/json"
http://127.0.0.1:9696/v2.0/subnets
Then, the dhcp-agent creates own DHCP-port, it is reproduced resync
bug.
B. Create port and exhaust allocation_pools
---------------------------------------------------------------
1. Create subnet with 192.168.1.0/24. And, DHCP-port has alteady created.
gateway_ip: 192.168.1.1
DHCP-port: 192.168.1.2
allocation_pools{"start": 192.168.1.2, "end": 192.168.1.254}
the number of availability ip_addresses is 252.
2. Create non-dhcp port and exhaust ip_addresses in allocation_pools
In this case, user creates a port 252 times.
the number of availability ip_addresses is 0.
3. User deletes the DHCP-port(192.168.1.2)
the number of availability ip_addresses is 1.
4. User creates a non-dhcp port.
the number of availability ports are 0.
Then, dhcp-agent tries to create DHCP-port. It is reproduced resync bug.
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