검색하면 나오기는 하는데 내가 쓰는 조합이 맘에 들어서.
ssh -N -v -L 8888:localhost:9999 ID@REMOTE_HOST
localhost (내쪽) 8888로 가는 접속을 원격 host의 9999로 보내되,
-N Do not execute a remote command. This is useful for just forwarding ports.
Refer to the description of SessionType in ssh_config(5) for details.
-v Verbose mode. Causes ssh to print debugging messages about its progress.
This is helpful in debugging connection, authentication, and configuration
problems. Multiple -v options increase the verbosity. The maximum is 3.