/lib/systemd/network http://manpages.ubuntu.com/manpages/focal/man5/systemd.network.5.html http://manpages.ubuntu.com/manpages/focal/man5/systemd.netwo... or

/lib/systemd/network http://manpages.ubuntu.com/manpages/focal/man5/systemd.network.5.html http://manpages.ubuntu.com/manpages/focal/man5/systemd.netwo... or find / -name '*.network' But yeah, BSD's would have them at one place -> /etc ...linux-distro standardization is a terrible mess.