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I have attempted to use the fixed_ip for our internal use. 

I found too many issues with the existing feature, and would propose to rewrite it as new feature. 

The problem I experienced are:
1. ) I have to repeatedly enter the option --fixed_ip for as many IPs as I need to apply. This will not scale if I wanted many IPs.2). The operation does not guarantee you get your original IP assigned, the VM instance become non-reachable.3). I can not requested seperate MAC addresses to go with the IP address.4.)  The command acces privilage is controlled by policy.  It would be more appropriate to use quota to control how many IPs a user can request instead of granting a privilage to the user.
To use the mulitple IP,you can use OVS, mac-vlan etc. But that requires seperate MAC address to go with IPs. 

 == Aihua Edward Li == 


     On Friday, October 30, 2015 12:00 PM, Shraddha Pandhe <spandhe.openstack at gmail.com> wrote:
   

 Hi folks,
James Penick from Yahoo! presented a talk on Thursday about how Yahoo uses Neutron for Ironic. I would like to follow up on one particular use case that was discussed: Multi-IP support.
Here's our use-case for Multi-ip:
For Ironic, we want user to specify the number of IPs on boot. Now, we want scheduler to find a network with sufficient IPs and then pick a host in that subnet (Note: static IPs for baremetal). Now, when allocating network, we want to assign all requested IPs from the same subnet as the host's static IP. Also, we don't want to configure those IPs on the host. We only want to display them on "nova show".
So basically we will only create one port for the host, and append all fixed_ips in the ports fixed_ip list field.
Questions:1. Hows do most people use the fixed_ips field in the port? What are different ways you can populate multiple IPs in fixed_ips? One way I know is, using neutron-client to create port, you can specify --fixed-ip as many times as you want, and that will append fixed_ips to the port. Any other way?
2. Is anybody else using multi-ip?


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