/usr/sbin/miniupnpd --help

/usr/sbin/miniupnpd --help
Unknown option: --help
Usage:
/usr/sbin/miniupnpd [-f config_file] [-i ext_ifname] [-o ext_ip]
[-a listening_ip] [-p port] [-d] [-U] [-S] [-N]
[-u uuid] [-s serial] [-m model_number]
[-t notify_interval] [-P pid_filename]
[-B down up] [-w url] [-r clean_ruleset_interval]
[-A "permission rule"] [-b BOOTID]

Notes:
There can be one or several listening_ips.
Notify interval is in seconds. Default is 30 seconds.
Default pid file is '/var/run/miniupnpd.pid'.
Default config file is '/etc/miniupnpd.conf'.
With -d miniupnpd will run as a standard program.
-S sets "secure" mode : clients can only add mappings to their own ip
-U causes miniupnpd to report system uptime instead of daemon uptime.
-N enables NAT-PMP functionality.
-B sets bitrates reported by daemon in bits per second.
-w sets the presentation url. Default is http address on port 80
-A use following syntax for permission rules :
(allow|deny) (external port range) ip/mask (internal port range)
examples :
"allow 1024-65535 192.168.1.0/24 1024-65535"
"deny 0-65535 0.0.0.0/0 0-65535"
-b sets the value of BOOTID.UPNP.ORG SSDP header
-h prints this help and quits.