It is not aways possible to extend a subnet due holes in your address
space.
Better way is to add another subnet to the network.
Underlying plugin should be able handle this properly. Some WiFI vendors
call it VLAN pooling. Or some call it multi netting.

Regards
-Harshad


On Nov 7, 2013, at 2:17 AM, Daniel Speichert <dan...@speichert.pl> wrote:

>From my experience, it is rather safe to extend allocation pools directly
in the database.
We also did allocation pool shrinking but always make sure there is no IP
associated (or even assigned to a project) from out of the new range.

Check the neutron MySQL table: ipallocationpools.

Regards,
Daniel

------------------------------

*From: *"Aaron Rosen" <aro...@nicira.com>
*To: *"Sam Lee" <lixq2...@gmail.com>
*Cc: *"openstack" <openstack@lists.openstack.org>
*Sent: *Thursday, November 7, 2013 4:28:44 AM
*Subject: *Re: [Openstack] Is there any way to extend the ip address of
subnet?

Hi Sam,

Unfortunately we do not support updating the allocation-pools on subnets at
this time. This is something that we should definitely fix though in
neutron.

Aaron


On Wed, Nov 6, 2013 at 10:46 PM, Sam Lee <lixq2...@gmail.com> wrote:

> Hi All,
>
>           I have created a subnet with 10 ips. But now I need more than
> ten instances, is there any way to extend the subnet to add ip address?
>           eg:
>           I have ten ips as following:
>                 172.16.2.210  ~ 172.16.2.220
>
>           I want to add 20 more ips, and so the result will be
>                 172.16.2.210 ~ 172.16.2.230
>
>          I try subnet-update command and create a new subnet with the same
> CIDR, but it doesn't work correctly.
>
>          Thanks in advance.
>
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