Detecting SSH tunnels on a linux firewall

Nicholas Leippe nick at
Wed Jan 10 10:15:19 MST 2007

On Wednesday 10 January 2007 10:11, Dave Long wrote:
> Is it possible to detect SSH tunnels traveling through a Linux
> firewall (iptables).  In other words, how do I detect normal ssh
> communication versus http traffic going through SSH?
> My initial thoughts were that normal SSH traffic would have a specific
> connection and packet rate while other traffic like HTTP going through
> SSH would have a much different connection rate.
> Anyway, I would like to know other ideas.

Why not just disable tcp forwarding in sshd_config?

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