[Ussuri][neutron] How to accomplish what allow_same_net_traffic did

Eugen Block eblock at nde.ag
Tue May 4 07:40:31 UTC 2021

Hi *,

I was wondering how other operators deal with this. Our cloud started  
somewhere in Kilo or Liberty version and in older versions the option  
allow_same_net_traffic allowed to control whether instances in our  
shared network could connect to each other between different projects.  
That option worked for us but is now deprecated and the Pike release  
notes [1] state:

> Given that there are other better documented and better tested ways  
> to approach this, such as through use of neutron’s native port  
> filtering or security groups, this functionality has been removed.   
> > Users should instead rely on one of these alternatives.

Does that mean all security groups need to be changed in a way that  
this specific shared network is not reachable? That would be a lot of  
work if you have many projects. Is there any easier way?


[1] https://docs.openstack.org/releasenotes/nova/pike.html

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