+usage: ${0##*/} [OPTIONS] [IPV6_ADDR/BITS]
+
+-4 Prefix of range for ipv4, default 10.8.0
+-6 IP6_NETWORK Do ip6 nat for this network. ipv6 will work without nat,
+ but you may want it in certain circumstances.
+-d Do not push dns
+-i INTERFACE_NAME name of tun interface
+-n NAME default = server. 2 servers on the same host need different names.
+-p PORT default 1194
+-r Do not push default route
+-s Do not start openvpn