6tunnel: invalid option -- '-'

usage: 6tunnel [-146dvh] [-s sourcehost] [-l localhost] [-i pass] [-I pass] [-L limit] [-A filename] [-p pidfile] [-m mapfile] localport remotehost [remoteport] -1 allow only single connection and quit -4 connect to IPv4 endpoints (default: connect to IPv6) -6 bind to IPv6 address (default: bind to IPv4) -d don't detach -f force tunneling (even if remotehost isn't resolvable) -h print hex dump of packets -i act like irc proxy and ask for password -I send specified password to the irc server -l bind to specified address -L limit simultaneous connections -p write down pid to specified file -s connect using specified address -m read specified IPv4-to-IPv6 map file -v be verbose