On 3/30/22, Dan Ritter <d...@randomstring.org> wrote: > Greg Wooledge wrote: >> On Wed, Mar 30, 2022 at 07:18:07PM +0100, Brian wrote: >> > That's good advice, but are MAC addresses memorable? >> >> Doesn't matter. You can choose a memorable name. The MAC address is >> simply the data point you place in the config file, so the system knows >> this is the interface you're talking about. >> >> unicorn:~$ cat /etc/systemd/network/10-lan0.link >> [Match] >> MACAddress=18:60:24:77:5c:ec >> >> [Link] >> Name=lan0 >> >> That's what I'm using. Of course, this relies on the MAC address being >> consistent across boots. I've heard of some cases where this isn't >> true, but I believe those cases involved removable devices (USB network >> interfaces or similar). > > Some NICs can have their MAC addresses changed permanently. > > There were at least a few terrible NICs in history where an > entire production run got the same MAC address assigned. > > Most NICs can have their MAC addresses reassigned after boot, > which will almost always be reset on next power cycle. > > lan0 is a good name. I like names like "internal" and "dmz" and "internet" > or "cogent" and "level3" -- either functional descriptors or > where their other ends are connected.
macchanger.. I tried it a couple years ago for some forgotten reason. I think it was when the names first started changing on us, and I was trying to take control of the situation. I remember it working and then not working. Can't remember now why I gave up on it. Thankfully things have ironed out some since so it hasn't been needed in my usage case. >From "apt-cache show," it seems to reference the same vendor MAC duplication instances (Point #4): Features: . * set specific MAC address of a network interface * set the MAC randomly * set a MAC of another vendor * set another MAC of the same vendor * set a MAC of the same kind (eg: wireless card) * display a vendor MAC list (today, 6200 items) to choose from Afterthought, my problems eased up after I figured out I could grep dmesg for "renamed from" and plug that result into where I needed the name. Tripped over that by accident. Might have started out grepping for eth0, maybe. Have fun! Cindy :) -- Talking Rock, Pickens County, Georgia, USA * runs with birdseed *
