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[Bug 1404937] [NEW] IpAddressGenerationFailure No more IP addresses

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Public bug reported:

Hi Guys,
When a user create a wrong network x.x.x.x/32 or subnet is full, neutron generate this error:

2014-12-22 06:31:48.970 6318 ERROR neutron.agent.dhcp_agent [-] Unable to enable dhcp for 67b05c84-7c53-4d11-89ad-afb0204f62d3.
2014-12-22 06:31:48.970 6318 TRACE neutron.agent.dhcp_agent RemoteError: Remote error: IpAddressGenerationFailure No more IP addresses available on network 67b05c84-7c53-4d11-89ad-afb0204f62d3.

When this happens neutron restart all dnsmasq services and all VMs fails
to renew DHCP lease:

Dec 22 16:37:25 mariadb2 dhclient: DHCPREQUEST of 10.29.81.115 on eth0 to 10.29.81.3 port 67 (xid=0x1997b37a)
Dec 22 16:37:25 mariadb2 dhclient: DHCPNAK from 10.29.81.3 (xid=0x1997b37a)
Dec 22 16:37:25 mariadb2 dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3 (xid=0x62a70cd4)
Dec 22 16:37:25 mariadb2 dhclient: DHCPREQUEST of 10.29.81.115 on eth0 to 255.255.255.255 port 67 (xid=0x62a70cd4)
Dec 22 16:37:25 mariadb2 dhclient: DHCPOFFER of 10.29.81.115 from 10.29.81.3
Dec 22 16:37:25 mariadb2 dhclient: DHCPACK of 10.29.81.115 from 10.29.81.3
Dec 22 16:37:25 mariadb2 dhclient: bound to 10.29.81.115 -- renewal in 50 seconds.

In an environment with many traffic this problem create a packet loss and the dnsmasq service are overworked
Do you have any idea to resolve that?

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1404937

Title:
  IpAddressGenerationFailure No more IP addresses

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  Hi Guys,
  When a user create a wrong network x.x.x.x/32 or subnet is full, neutron generate this error:

  2014-12-22 06:31:48.970 6318 ERROR neutron.agent.dhcp_agent [-] Unable to enable dhcp for 67b05c84-7c53-4d11-89ad-afb0204f62d3.
  2014-12-22 06:31:48.970 6318 TRACE neutron.agent.dhcp_agent RemoteError: Remote error: IpAddressGenerationFailure No more IP addresses available on network 67b05c84-7c53-4d11-89ad-afb0204f62d3.

  When this happens neutron restart all dnsmasq services and all VMs
  fails to renew DHCP lease:

  Dec 22 16:37:25 mariadb2 dhclient: DHCPREQUEST of 10.29.81.115 on eth0 to 10.29.81.3 port 67 (xid=0x1997b37a)
  Dec 22 16:37:25 mariadb2 dhclient: DHCPNAK from 10.29.81.3 (xid=0x1997b37a)
  Dec 22 16:37:25 mariadb2 dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3 (xid=0x62a70cd4)
  Dec 22 16:37:25 mariadb2 dhclient: DHCPREQUEST of 10.29.81.115 on eth0 to 255.255.255.255 port 67 (xid=0x62a70cd4)
  Dec 22 16:37:25 mariadb2 dhclient: DHCPOFFER of 10.29.81.115 from 10.29.81.3
  Dec 22 16:37:25 mariadb2 dhclient: DHCPACK of 10.29.81.115 from 10.29.81.3
  Dec 22 16:37:25 mariadb2 dhclient: bound to 10.29.81.115 -- renewal in 50 seconds.

  In an environment with many traffic this problem create a packet loss and the dnsmasq service are overworked
  Do you have any idea to resolve that?

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