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Dennis Wisnia
Asked: 2012-04-16 02:08:27 +0800 CST

SSH Tunneling for Munin

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I had at home an NAS and in the datacenter a Server. I make an SSH Tunnel with the following command:

autossh -fN -M20404 -R 1337:localhost:22 user@server

(from the nas to the server) Its working and I can access the NAS. Now, I want access the munin-node, also I make a new tunnel from the server to the nas:

ssh -N -R 49499:localhost:4949 localhost -p 1337

but if I make an nmap localhost -p 49499 the port is closed and i cant access the munin-node.

I don't know why and I am very happy about your help.

ssh munin tunnel

1 Answers

  1. Best Answer

    If you would like to access your munin-node running on your NAS from your server, you should use in your ssh command a direct port forwarding with -L instead of a reverse port forwarding with -R:

    On the NAS:

    nas $ autossh -fN -M20404 -R 1337:localhost:22 user@server

    On the server:

    server $ ssh -N -L 49499:localhost:4949 localhost -p 1337

    Then from your server, telnet localhost 49499 should connect to your munin-node on the NAS.

    If you don't need your autossh command for something else, you could simplify everything with only one command on your NAS:

    nas $ autossh -fN -M20404 -R 49499:localhost:4949 user@server

    Then again on the server, you can access the munin-node of your NAS with telnet localhost 49499 as well, through the SSH tunnel.

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