Eurotech ZEUS Uživatelský manuál stáhnout pdf (Strana 28)

Arcom Embedded Linux Technical Manual Secure Shell (SSH)

Port forwarding

SSH has the ability to tunnel TCP/IP connections from the local machine to the remote

host and vice-versa. This is useful to provide a secure wrapper around an insecure

protocol.

For example, to create a secure tunnel from the local machine to a mail server running

remotely on port 25, you could enter the following:

$ ssh –L 2525:localhost:25 [email protected]

localhost refers to the local host from the perspective of the remote host. Anyone

connecting to port 2525 on your local host is therefore forwarded through the SSH

tunnel to port 25 on mail.example.net.

You need not use localhost. For example, the following command enables anyone with

access to your local machine to access mail.example.net, which we assume is secured

behind the example.net firewall:

$ ssh –L 2525:mail.example.net:25 firewall.example.net

You can also forward a port on the remote machine to any machine accessible from

your local machine. For example, to tunnel port 2525 on the remote machine to a mail

server on your local network, enter the following:

$ ssh –R 2525:mail.example.net:25 ael.example.net

Anyone connecting to port 2525 on ael.example.net is forwarded to mail.example.net

on your local network.

Further information about SSH

The preceding sections provide simple examples of what you can achieve using SSH.

Further information about using SSH is on the OpenSSH website, at www.openssh.org

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Eurotech ZEUS Uživatelský manuál Strana 28