.Packets silently dropped when external MTU is greater than internal MTU RHOSO does not fragment north-south packets as expected when the external MTU is greater than the internal MTU. Instead, if the ingress packets are dropped with no notification. Also, fragmentation does not work on east/west traffic between tenant networks. Until these issues are resolved, ensure that the external MTU settings are less than or equal to internal MTU settings, and that all MTU settings on east/west paths are equal. *Procedure:* . Set `ovn_emit_need_to_frag` to `true`. . Set `global_physnet_mtu` to a size that is at least 58 bytes larger than the external network MTU, to accommodate the geneve tunnel encapsulation overhead. . Set `physical_network_mtus` value pairs to describe the MTU of each physical network. . Ensure that the MTU setting on on every device on the external network is less than the internal MTU setting. . To apply the changes to an existing router, delete the router and re-create it. .Example For example, suppose that the external network `datacentre` MTU is 1500. . Enter the following neutron settings in your OpenStackControlPlane CR: + ---- neutron:     enabled: true :     template:  :       customServiceConfig: |         [DEFAULT]         global_physnet_mtu=1558         [ml2]         physical_network_mtus = ["datacentre:1500"]         [ovn]         ovn_emit_need_to_frag = true ---- + . Ensure that the MTU setting on on every device on the external network is less than the internal MTU setting. . Ensure that all tenant networks that use the OVN router have the same MTU. . To apply the changes to an existing router, delete the router and re-create it.