Our localnet example does not include the MTU attribute. That is problematic, since the OVN localnet default is 1400, while the standard value would be 1500. This leads to situations where customers suffer packet loss without any understanding what may be wrong (they assume their MTU is 1500 everywhere).

4.15+

Always

1. Go to https://docs.redhat.com/en/documentation/openshift_container_platform/4.15/html/virtualization/networking#virt-creating-localnet-nad-cli_virt-connecting-vm-to-ovn-secondary-network
2. See the NAD example

    {
            "cniVersion": "0.3.1", 1
            "name": "localnet-network", 2
            "type": "ovn-k8s-cni-overlay", 3
            "topology": "localnet", 4
            "netAttachDefName": "default/localnet-network" 5
    }

    {
            "cniVersion": "0.3.1", 1
            "name": "localnet-network", 2
            "type": "ovn-k8s-cni-overlay", 3
            "topology": "localnet", 4
            "mtu": 1500, 5
            "netAttachDefName": "default/localnet-network" 6
    }