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the IP allocation pool can be a subset of the overal subnet range, if for
example, you want to limit the set of IP addresses that Quantum will hand
out to a sub-range of the total IPs in the subnet.  This can be useful if a
quantum network is shared with hosts outside of openstack (e.g., with
physical hosts provisioned outside of openstack).

dan

On Wed, Nov 28, 2012 at 5:09 PM, Ahmed Al-Mehdi <ahmedalmehdi at gmail.com>wrote:

> Thank you very much for the explanation.  However, I am still a bit
> confused.  In the command "quantum subnet-create ..." for external network,
> I am already providing start/end allocation pool IP addr.  What is the need
> for the "192.168.50.100/24" option?  In this case, is this option
> redundant  OR  not needed (as in not used by Quantum)  OR not correctly
> specified?
>
> You mentioned "192.168.50.100/30", how did you get "/30"?  Is that an
> example?  Or is that based on the start/end IP allocation pool?
>
> Thank you,
> Ahmed.
>
>
>
> On Wed, Nov 28, 2012 at 4:44 PM, gong yong sheng <
> gongysh at linux.vnet.ibm.com> wrote:
>
>>  On 11/29/2012 07:56 AM, Ahmed Al-Mehdi wrote:
>>
>> Hello,
>>
>>  I have a few questions related to private and external network in
>> Quantum.  I am running into some odd behavior with networking related to my
>> VM instance that I am trying to resolve.
>>
>>
>>  # quantum net-create --tenant-id $put_id_of_service_tenant ext_net
>> --router:external=True
>>
>>  # quantum subnet-create --tenant-id $put_id_of_service_tenant
>> --allocation-pool start=192.168.50.102,end=192.168.50.126 --gateway
>> 192.168.50.1 ext_net192.168.50.100/24 --enable_dhcp=False  (step b)
>>
>>
>> -  192.168.50.100/24:  Is 192.168.50.100 assigned (reserved) for any
>> purpose?  What is this cidr represent?
>>
>> It should be a wrong cidr.
>> I think if you are using 192.168.50.100/30, the 192.168.59.101 will be
>> reserved.
>>
>>
>
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-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Dan Wendlandt
Nicira, Inc: www.nicira.com
twitter: danwendlandt
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