this post was submitted on 19 May 2025
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ifupdown2 has a 15-character interface name limit, and the systemd predictable interface naming system uses the mac address for usb nics (giving them a 15-character name), so if you try to create a vlan subinterface of a usb nic using the standard interface.vlan naming scheme on a systemd host, it will fail, and you'll have to set up systemd network link files to rename the base interfaces to something shorter.
It's the same when creating network interfaces via the
iptool.I'm almost sure the backstory to how you gained this knowledge is "i spent hours debugging something, and that 15 chars limit was the problem"
Yep exactly! Setting up a raspberry pi low-performance computing cluster with secondary usb nics, going slowly insane trying to figure out why the vlan interfaces wouldn't work when their base interfaces worked just fine, and going down all of the wrong rabbit holes along the way.
And all that just because someone decided that an array bigger that 16 bytes would have been too expensive (/s probably)
Reminds me of the ESP32 ROM dictionary only taking a 15 character limit and simply bugging out silently without any notification whatsoever. Arduino, so easy to use, great for beginners. It has got all the wild goose chases!
Tell me you had to do real work with Systemd and discovered what a steaming useless pile of millennial shite it is as a whole, without using those words. The only cure for lennart's cancer is to cut it out.