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Hi Andrew,

thanks for the prompt reply.

I'm using fixed ip addresses, not floating IPs. In terms of Heat it 
looks like there:

n1-wan:
   type: OS::Neutron::Port
   properties:
     name: n1-wan
     network: e-net
     fixed_ips: [ { subnet: e-subnet, ip_address: X.X.X.X } ]

n1:
   type: OS::Nova::Server
   properties:
     name: n1
     networks:
       - port: { get_resource: n1-wan }

and there are some constraints in my installation:

 1. I can't move ports between VMs (in order to support predictable
    naming according to port roles, their MAC addresses are stored in
    udev rules inside VM and if I will change port, rules/roles will fail)
 2. I don't want to use floating ip due to possible performance
    degradation when using massive NAT

Another idea I have is to move ports between VMs, changing their MACs 
accordingly and will try it if no other ways will be found :)

Thanks again.

On 8/23/17 5:17 PM, 공용준 wrote:
> Hi
>
> You can use fixed ip port for this.
> create neutron port and attach it to the one vm.
> or
> you can use floating ip for this purpose as well
>
> Regards,
> Andrew
>> 2017. 8. 23. 오후 10:58, Volodymyr Litovka <doka.ua at gmx.com 
>> <mailto:doka.ua at gmx.com>> 작성:
>>
>> Hi colleagues,
>>
>> imagine, somebody (e.g. me :-) ) needs to transfer IP address between 
>> two ports. The straight way is: release IP address and then assign it 
>> to another port.
>>
>> The possible problem with this way is time between release and 
>> assignment - during this time, this IP address is in DHCP pool and 
>> can be automatically assigned to some another port upon request.
>>
>> Any ideas how to prevent leasing this IP address during this time?
>>
>> Thank you.
>>
>> -- 
>> Volodymyr Litovka
>>    "Vision without Execution is Hallucination." -- Thomas Edison
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>

-- 
Volodymyr Litovka
   "Vision without Execution is Hallucination." -- Thomas Edison

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