I have a system with two ethernet sockets on the motherboard, and I have until very recently been finding that my network at random failed to come up during the boot process. I have the ethernet cable plugged into only one of the two sockets, and assign the names to the interfaces as eno1 and eno2 - because left to its own it assigned one of them as name "eno1" and the other to "eth0" or "eth1" at random between boots! I was surprised that it chose ethX at all for the second name, given this is running with the new naming scheme! However following the hints at: https://wiki.archlinux.org/index.php/Udev#Network_device I specify that udev fix the two interface names as eno1 and eno2 - but still the network failed to come up sometimes at boot. It seemed to be pure chance as to whether it came up on any particular boot. I tried both NetworkManager as well as ifplugd/netcfg and both seemed to behave the same way - at any one time I only had one or other scheme for getting the network up. What I then presumed was that although the same two names are always assigned, the hardware mac address to which of the two physical network ports was being assigned was being assigned differently to the two names - i.e. sometimes being en01 and sometimes being eno2. Why this matters is that I assign a static ip address to eno1 only and don't use eno2. This would only be an issue if there was more than one NIC in the system. The system boots really fast as it has SSD drives, which possibly was not allowing enough time for the name assignment, so I then found the advice at: https://wiki.archlinux.org/index.php/Rename_network_interfaces where it suggests editing the systemd unit file for in my case NetworkManager service - which I then did and this finally seems to have fixed the problem though I will still need to boot over a period of days to check if the network comes up "every" time now. The wiki page refers to the network service file, but I applied this to the NetworkManager service file. So the question that I hope someone can answer is whether in the case of multiple NICs in a system the new network names, although the same "set" of names is used for all the cards in the system, will still need this systemd unit file amendment - i.e. adding the two lines: Requires=systemd-udev-settle.service After=systemd-udev-settle.service to the [unit] section in order to get the correct name associated with the same hardware mac address every boot? If someone who understands these things in detail could confirm if my understanding is correct I would appreciate it? Many thanks. -- mike c
