On Fri, Jan 31, 2020 at 11:05:32AM -0500, Greg Wooledge wrote: > On Fri, Jan 31, 2020 at 04:53:28PM +0100, tomas@tuxteam.de wrote: > > I see, thanks. I must admit that I don't know very much about how > > systemd names network interfaces. In practice, what I get to see > > roughly follows the known conventions (bus number, etc). > > > > Udev is/was just a mechanism to implement those conventions. Or > > different ones. > > > Is it using something else than udev, these days? > > Yes. > > https://wiki.debian.org/NetworkInterfaceNames > http://manpages.debian.org/systemd.link Thanks. Now I understand the confusion. What's being called "udev" here was just that one MAC-based "70-persistent-rules" thingy. Nowadays (Buster, no systemd but udev) Debian ships udev rules implementing the "predictable" scheme (as it's called in the above wiki). Cf. 75-net-description.rules, for example. And systemd relies on udev to actually implement its mechanism, as can be guessed from the man page you link to above. So -- strictly speaking, "udev" is just the mechanism, the policy is defined by sets of udev rules (possibly disguised as .link files whenever systemd is in control) -- and loosely speaking, whenever folks say here "udev interface names", they are talking about the now defunct MAC based [1] interface names once-upon-a-time implemented by a sadly notorious 70-persistent-net.rules or something (the exact spelling escapes me at the moment). On my original post: I was talking about those (newer) "predictable" interface names. I've no use for them. Someone else might. YMMV. Etc. Cheers [1] This one bit me once in the ass. Remember that thing where a virtual machine used to roll dice on the mac address of its virtual interface? -- tomás
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