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doc:howto:autossh

Autossh

Autossh monitors a ssh connection and reconnects the ssh-session if the connection fails.

To automatically log in you need to use an authentication key.

Use Case

  • You want to forward a local port (e.g. the webserver/ssh) to a remote server.
  • If your client running OpenWrt is behind a NAT, this allows to connect to a server that is not behind a NAT and create a reverse tunnel to the local ssh server.

Installation

Install autossh

opkg install autossh

Create a key

dropbearkey -t rsa -f /etc/dropbear/id_rsa

dropbearkey will print the public key, starting with ssh-rsa. You can reprint the key using

dropbearkey -y -f /etc/dropbear/id_rsa
or write it to a file (e.g. /tmp/pubkey)
dropbearkey -y -f /etc/dropbear/id_rsa  | grep ssh-rsa > /tmp/pubkey

Add the key to the authorized_keys file on your server. E.g. Copy pubkey file to the server an do

cat pubkey >> ~/.ssh/authorized_keys

Configuration

Autossh is configured using the Unified Configuration Interface (/etc/config/autossh).

Fixes

To get ssh working you need to replace localhost in 2222:localhost:22 of the ssh variable to the local ip.

doc/howto/autossh.txt · Last modified: 2013/07/08 15:40 by tmomas