notes

-L to make connection to local address forward to remote addr.

e.g. when creating vm via qemu, not easy to configure port forwarding easily when vm is running. We can use -L option to achieve this.

-L [bind_address:]port:host:hostport
-L [bind_address:]port:remote_socket
-L local_socket:host:hostport
-L local_socket:remote_socket

Specifies that connections to the given TCP port  or  Unix  socket  on  the  local
(client)  host  are to be forwarded to the given host and port, or Unix socket, on
the remote side.

-D to listen on an port, creating an socks5 proxy.

e.g. poor man’s fq.

-D [bind_address:]port

Specifies  a local “dynamic” application-level port forwarding.
This works by allocating a socket to listen to port on the local side,
optionally  bound  to  the specified  bind_address.   Whenever a connection is
made to this port, the connection is forwarded over the secure channel, and
the application  protocol  is  then used  to  determine  where  to  connect to
from the remote machine.