options

x forwarding

• does not work on slackware
  ssh -X
• trusted, works on debian/slackware
  ssh -Y

create

Example: This can be used to create a socks proxy for a browser.

ssh -f -D $PORT $SERVER sleep 30000

• D bindaddres:port / port (assumes localhost)
• sleep 30000 : keep the connection alive with sleep command

connect through vpn on ssh tunnel

Example: If a SQL Server is only accesible in a different network, a tunnel can be created to access the SQL server through a computer that is accessible from outside that network.

commands

ssh -f -L 127.0.0.1:$PORT:$TARGET_SERVER:$TARGET_PORT $SSH_SERVER_USR@$SSH_SERVER sleep 30000

ssh -f -L 127.0.0.1:1234:SQL_server:1433 user@ssh_server sleep 30000

NOTE: on Microsoft SQL Server Studio use 127.0.0.1,1234

example

This will always use port 8686 to connect to hostname:

Host hostname
	Port 8686

control master

The user needs to have write permissions in the directory where the socket will be created.

Create a persistent connection when connecting to a remote machine. Eg.:

Host [HOST]
	ControlMaster auto
	ControlPersist yes
	ControlPath [PATH_TO_CONTROL_SOCKET]/%r@%h:%p

OpenBSD manpages

ssh(1) , ssh_config(8) , sshd_config(8)

files

<ssh.oh>