{endcode}
NETWORK_INTERFACE is required; used for detection of scope ids.
+
+The meaning of $(HOSTNAME) in the configuration file changes partway through handling the configuration files! It will initial be the same as "hostname -s", but will eventually become the NO_DNS name (2607-f388-1086-0-21e-68ff-fe0f-6462.example.com).
+
+TODO
+*: Is the changing meaning of $(HOSTNAME) with NO_DNS even present in IPv4? File as a bug.
