# -4 Forces ssh to use IPv4 addresses only. # -6 Forces ssh to use IPv6 addresses only. # -C Requests compression of all data # -p port Port to connect to on the remote host. # -f Requests ssh to go to background just before command execution. # -q Quiet mode. Causes most warning and diagnostic messages to be suppressed. # -N Do not execute a remote command. This is useful for just forwarding ports. # -D [bind_address:]port Specifies a local “dynamic” application-level port forwarding. # -L [bind_address:]port:host:hostport Specifies that connections to the given local host are to be forwarded to the given host and hostport.