Reverse SSH tunnel and dropbear KeepAlive

Discussion in 'Networking Issues' started by subaquatic, Nov 28, 2013.

  1. subaquatic

    subaquatic Networkin' Nut Member


    My router is behind a nat and I'm trying to setup a reverse ssh tunnel with the following command:

    autossh -M 10000 -f -N -o "ServerAliveInterval 30" -o "ServerAliveCountMax 999" -R 2222: -p 12345

    This works beautifully for a few minutes, then exits normally according to the logs. I think the firewall closes ssh connections with no traffic after 60 seconds.

    So how do I enable the KeepAlive -K parameter on dropbear? If I tack it on this statement, autossh says its incorrect syntax. Also, the -o "ServerAliveInterval 30" -o "ServerAliveCountMax 999", while good for autossh, aren't used by dropbear.

  2. eibgrad

    eibgrad Network Guru Member

    That's the problem w/ dropbear; it's not a full SSH implementation. That's why it helps to have a router capable of installing Optware, where you can install full-featured packages (e.g., OpenSSH). Dropbear has plenty of other limitations too (e.g., no dynamic proxy (-D), proprietary private/public key format (ugh)).
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