On Tue, 23 Apr 2019 21:05:05 +0100 Justin B Rye <[email protected]> wrote:
> Greg Wooledge wrote: > > In the release notes, there's a udevadm command which is supposed to > > tell us what the new interface name will be, but I had some trouble > > interpreting the output. > > > > wooledg:~$ udevadm test-builtin net_id /sys/class/net/eno1 > > 2>/dev/null ID_NET_NAMING_SCHEME=v240 > > ID_NET_NAME_MAC=enxa08cfdc389e0 > > ID_OUI_FROM_DATABASE=Hewlett Packard > > ID_NET_NAME_ONBOARD=eno1 > > ID_NET_LABEL_ONBOARD=enOnboard Lan > > ID_NET_NAME_PATH=enp0s31f6 > > I thought the new interface name would be enp0s31f6 but it turned > > out to be eno1 instead. >The complication > you've run into there is the fact that ID_NET_NAME_ONBOARD names, > where present, take priority over ID_NET_NAME_PATH names (and your > ID_NET_NAME_PATH name is itself a complicated one). It's hard to > summarise completely and concisely (there are further problems with > USB dongles and virtual machines and so on), so what we most need is > good external sources we can point to. The upstream docs at > https://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/ > *do* cover your case (the bit about "1. Names [...] for on-board > devices"), but it doesn't exactly leap out at you. > Oh, looking at it again: maybe where it currently says > > <para> > This should give enough information to devise a migration plan. > (The <literal>udevadm</literal> output will include a fallback > MAC-based name, sometimes needed for USB network hardware.) > </para> > > We could fit in some sort of mention of ID_NET_NAME_ONBOARD as well? It would sure be nice to have an ordered list where the topmost in the list which appears in the udevadm output is used: ID_NET_NAME_ONBOARD ID_NET_NAME_PATH ID_NET_NAME_MAC And so forth. I don't even know if this makes sense but without some guidance there's just no way for the reader to know what name the kernel will use. Regards, Karl <[email protected]> Free Software: "You don't pay back, you pay forward." -- Robert A. Heinlein
