Just upgraded to FC31. It's a multihomed machine used as a router. One interface "external" goes to the cable modem. The other interface "internal" goes to a switch. cat /etc/sysconfig/network-scripts/ifcfg-external | grep -v \# TYPE=Ethernet BOOTPROTO=dhcp DEVICE=external ONBOOT=yes DEFROUTE=yes IPV4_FAILURE_FATAL=no IPV6INIT=no USERCTL=no HWADDR=50:7B:9D:0B:8A:AB NAME=external UUID=02b123a7-baea-20e2-051e-8a9ec27cc44a cat /etc/sysconfig/network-scripts/ifcfg-internal | grep -v \# DEVICE=internal TYPE=Ethernet BOOTPROTO=none ONBOOT=yes IPADDR=10.10.11.251 PREFIX=24 DEFROUTE=no IPV4_FAILURE_FATAL=no IPV6INIT=no PEERDNS=no USERCTL=no UUID=ef5b0746-2604-b21f-c03e-00556aef68fc HWADDR=00:0e:c6:dc:01:aa But neither interface is found on boot: enp0s20u3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 ether 00:0e:c6:dc:01:aa txqueuelen 1000 (Ethernet) RX packets 2573 bytes 172174 (168.1 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 enp1s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 ether 50:7b:9d:0b:8a:ab txqueuelen 1000 (Ethernet) RX packets 2581 bytes 180221 (175.9 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10<host> loop txqueuelen 1000 (Local Loopback) RX packets 765 bytes 81440 (79.5 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 765 bytes 81440 (79.5 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 even though the MAC adresses match. As do the UUID's: nmcli connection show | grep ernal external 02b123a7-baea-20e2-051e-8a9ec27cc44a ethernet -- System internal ef5b0746-2604-b21f-c03e-00556aef68fc ethernet -- enp0s20u3 is a USB interface that should be internal. If I unplug and replug, naming works. On boot: kernel: asix 2-3:1.0 eth0: register 'asix' at usb-0000:00:14.0-3, ASIX AX88772 USB 2.0 Ethernet, 00:0e:c6:dc:01:aa kernel: usbcore: registered new interface driver asix kernel: asix 2-3:1.0 enp0s20u3: renamed from eth0 then I unplug and plug: kernel: asix 2-3:1.0 internal: renamed from enp0s20u3 kernel: asix 2-3:1.0 internal: link up, 100Mbps, full-duplex, lpa 0x45E1 That does not happen if I plug and unplug external, an ethernet cable. BUT, what's really odd. I'm booting the Fc31 kernel: kernel-5.3.11-300.fc31.x86_64 if I boot the same kernel, but FC30: kernel-5.3.11-200.fc30.x86_64 IT WORKS !! Any help appreciated. sean