With this setting in neutron.conf, instance will get MTU 1500. [DEFAULT] global_physnet_mtu = 1558 Thanks! Tony ________________________________________ From: Łukasz Chrustek <lukasz@chrustek.net> Sent: September 23, 2024 11:22 AM To: openstack-discuss Subject: Network MTU setting in ovn/ovs Hi, I have a question about increasing MTU for tenant network. Now it set to 1442 by default on geneve baked tenant network. Is there any drawbacks or it is some kind of bad practice to increase this MTU to 1500 bytes or higher ? We had an issue with one migrated instance from older version of openstack (where was linuxbrigde configured), there mtu was set to 1500, so the settings for i.e. docker inside the vm was set respectively to the higher value. -- Best regards Lukasz Chrustek