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 The value is 10

 Do you believe that it should be bigger?

 Best,

 George

> Well, what value do you have for send_arp_for_ha_count ?
> On 13 Mar 2015 17:11, "Georgios Dimitrakakis"  wrote:
>
>> So according to that it sends ARP every time a floating IP is
>> assigned at a VM. Am I right?
>>
>> If that is correct unfortunately its not working :-(
>>
>> Any ideas how to debug it?
>>
>> Thanks a lot for your help!
>>
>> Regards,
>>
>> George
>>
>>> Based on the code, it sends the gratuitous ARPs only when the
>>> floating
>>> IP is assigned to the VM, and its sent as many times as the user
>>> decided by configuring the "send_arp_for_ha_count" parameter in
>>> nova.conf
>>>
>>> So, to be safe, I would add the following in nova.conf and
>>> restart
>>> nova services.
>>>
>>> send_arp_for_ha=true
>>> send_arp_for_ha_count=20
>>>
>>> On Fri, Mar 13, 2015 at 2:54 PM, Georgios Dimitrakakis  wrote:
>>>
>>>> George,
>>>>
>>>> how often does it send the gratuitous ARP requests?
>>>>
>>>> Does it send it every time a network change is happening?
>>>>
>>>> Best,
>>>>
>>>> George
>>>>
>>>>> You have to set two variables in the nova.conf file apparently
>>>>> ("send_arp_for_ha" and "send_arp_for_ha_count"):
>>>
>>>
>>
> 
> https://github.com/openstack/nova/blob/3658e1015a2f7cb7c321cc1a0adfda37757fd80b/nova/network/linux_net.py#L764
>>> [11]
>>>
>>>>> [4]
>>>>> [4]
>>>>>
>>>>> On Fri, Mar 13, 2015 at 2:00 PM, Georgios Dimitrakakis 
>>>>> wrote:
>>>>>
>>>>>>> On 03/13/2015 05:54 AM, Georgios Dimitrakakis wrote:
>>>>>>>
>>>>>>>>> On 03/12/2015 06:24 PM, Georgios Dimitrakakis wrote:
>>>>>>>>>
>>>>>>>>>> Hello!
>>>>>>>>>>
>>>>>>>>>> I am facing a rather weird issue and would like to
>>>>>>>>>> know
>>>>>>>>>> if
>>>>>>>>>> anyone has
>>>>>>>>>> faced it before and the way you have solved it (if
>>>>>>>>>> any).
>>>>>>>>>>
>>>>>>>>>> Firstly, I d like to let you know that I am running
>>>>>>>>>> Icehouse with Nova-Legacy
>>>>>>>>>> Networking.
>>>>>>>>>>
>>>>>>>>>> I have an application that launches and terminates
>>>>>>>>>> VMs
>>>>>>>>>> very
>>>>>>>>>> frequently and
>>>>>>>>>> automatically assigns to them
>>>>>>>>>> floating IP addresses.
>>>>>>>>>>
>>>>>>>>>> As a result if an IP has been used once then the
>>>>>>>>>> second
>>>>>>>>>> time that is being used
>>>>>>>>>> cannot be reached for at
>>>>>>>>>> least 20minutes (this is the time frame if the
>>>>>>>>>> newly
>>>>>>>>>> launched VM gets the same
>>>>>>>>>> IP address from one that
>>>>>>>>>> has just been terminated). Furthermore, this issue
>>>>>>>>>> only
>>>>>>>>>> happens when the second
>>>>>>>>>> VM is launched on a
>>>>>>>>>> different physical node (hypervisor) than the first
>>>>>>>>>> one.
>>>>>>>>>>
>>>>>>>>>> I believe that I have identified the problem to be
>>>>>>>>>> ARP
>>>>>>>>>> Caching on the router
>>>>>>>>>> side since if I do:
>>>>>>>>>>
>>>>>>>>>> arping -U -I {Interface-Name} {IP-Address}
>>>>>>>>>>
>>>>>>>>>> in order to update the ARP Caches of the neighbors
>>>>>>>>>> immediately the new VM can be
>>>>>>>>>> reached on its floating
>>>>>>>>>> IP address.
>>>>>>>>>>
>>>>>>>>>> Is this the proper way of solving it?
>>>>>>>>>>
>>>>>>>>>> Can I somehow "instruct" OpenStack not to use the
>>>>>>>>>> first
>>>>>>>>>> available IP address
>>>>>>>>>> everytime but on a random order
>>>>>>>>>> or the one that hasnt been used for enough time?
>>>>>>>>>>
>>>>>>>>>> Any other thoughts?
>>>>>>>>>
>>>>>>>>> Just a thought, have you tried enabling
>>>>>>>>> "send_arp_for_ha"
>>>>>>>>> in
>>>>>>>>> nova.conf?
>>>>>>>>>
>>>>>>>>> Chris
>>>>>>>>
>>>>>>>> Hi Chris! Thx for the feedback!
>>>>>>>>
>>>>>>>> send_arp_for_ha = True
>>>>>>>>
>>>>>>>> is already enabled in all nodes (controller and
>>>>>>>> compute).
>>>>>>>>
>>>>>>>> Can I somehow verify that its working?
>>>>>>>
>>>>>>> You should be able to verify with a packet sniffer
>>>>>>> somewhere
>>>>>>> on
>>>>>>> your network.
>>>>>>>
>>>>>>>> How often is it sending the ARP request? Does it send it
>>>>>>>> every
>>>>>>>> time nova configuration is changing?
>>>>>>>
>>>>>>> Im very much *not* an expert in this area, so Im afraid
>>>>>>> Im
>>>>>>> not
>>>>>>> the
>>>>>>> right person to ask about that.
>>>>>>>
>>>>>>> Chris
>>>>>>
>>>>>> Chris,
>>>>>>
>>>>>> thanks for the feedback. Any idea on what to sniff for?
>>>>>>
>>>>>> George
>>>>>>
>>>>>> _______________________________________________
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> 
> https://github.com/openstack/nova/blob/3658e1015a2f7cb7c321cc1a0adfda37757fd80b/nova/network/linux_net.py#L764
>>> [12]
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> 
> https://github.com/openstack/nova/blob/3658e1015a2f7cb7c321cc1a0adfda37757fd80b/nova/network/linux_net.py#L764
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> https://github.com/openstack/nova/blob/3658e1015a2f7cb7c321cc1a0adfda37757fd80b/nova/network/linux_net.py#L764
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> https://github.com/openstack/nova/blob/3658e1015a2f7cb7c321cc1a0adfda37757fd80b/nova/network/linux_net.py#L764
> [12]
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