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Hello.
Thanks a lot Erik my problem was the MTU. 
if I go back to a situation with MTU=1500 everywhere, all is working fine !!! 

Is the following configuration possible and if so, how to configure with kolla-ansible files ? :

3 networks:
  - external (2 externals, VLAN 10 and VLAN 20): MTU = 1500
- admin:MTU=1500
- management : MTU = 9000 (a scsi bay stores volumes, with mtu 9000 ok).

Like this: 
`
Thanks a lot if you have a solution for this.
If  impossible, I stay with 1500… it’s working, no problem.

Franck 


> Le 12 nov. 2022 à 21:00, Franck VEDEL <franck.vedel at univ-grenoble-alpes.fr> a écrit :
> 
>> 3) Networking issues like mismatched MTU
> 
> My MTU (between nodes ) is 9000…. 
> 
> I believe my problem is the  MTU.
> 
> I modified /etc/kolla/config/neutron.conf and /etc/kolla/config/neutron/ml2_conf.ini.conf
> then kolla-ansible -i multinode reconfigures
> 
> (case 1 here: https://docs.openstack.org/newton/networking-guide/config-mtu.html <https://docs.openstack.org/newton/networking-guide/config-mtu.html>)
> 
> I test again everything and functions that did not work work again but not all....
> 
> For example, instances get an ip through dhcp but can't ping the router, but on some networks it works.
> However, before the reboot of the servers, I had not had a problem with the MTU of 9000.
> 
> I'm going back to a 1500 MTU on Monday on site.
> 
> Thank you Eric!!!
> 
> Franck VEDEL
> 
> 
> 
> 

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