this post was submitted on 27 Jun 2024
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I always just derive the interface name from first principles. Like, if I want to know which interface will be used to get out to the internet in a script, I'll just find the one that's L2 adjacent with the default gateway. If I'm given an egress or cidr, I'll just find the interface that has that IP. Modern
iproute2
has a JSON output option which makes getting this information pretty trivial. Doing that means that it doesn't matter what scheme your OS is using.I personally prefer the persistent names for Ethernet, although I don't like them for WiFi. Luckily, it seems like my wireless adapter always just ends up as wlan0. I'm not sure why that's the case, but it works out well in the end for me.