The unit's ExecStartPre baked the first hostname -I token into
host-ip.env, which config.rs prefers over its own detection — once a
VPN/bridge interface existed (netbird's wg tunnel), every host_ip
consumer (install configs, VPN, mint URLs) got the tunnel IP. Read the
main-table default route's src address instead, falling back to
hostname -I on routeless hosts.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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