[Link]
# The ZeroTier overlay must NOT gate network-online.target. The ztuga7c2kh interface
# only exists once zerotier-one starts, but zerotier-one is ordered After=network-online.target.
# Without this, systemd-networkd-wait-online blocks on the (not-yet-existing) ZT link until its
# 120s timeout, delaying boot and ZeroTier by ~2min every reboot. Real uplink readiness is
# covered by NetworkManager-wait-online, not networkd. Drop-in (manager regenerates the main file).
RequiredForOnline=no