openbsd-ports/net/darkstat/pkg
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darkstat.rc
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+-----------------------------------------------------------------------
| Running ${PKGSTEM} on OpenBSD
+-----------------------------------------------------------------------

By default, when started from the rc.d(8) script, darkstat will listen to
traffic on the first egress interface, and only allow TCP connections from
localhost. If using NAT, the internal interface might be a better choice
than the egress; to use alternative settings, override the defaults in
rc.conf.local e.g.:

darkstat_flags=-i em2 -b 127.0.0.1 --syslog