[X2Go-Dev] Traffic shaping nightmare - missing SSH TOS bits

[Jan Engelhardt]

On Tuesday 2012-02-21 07:05, John A. Sullivan III wrote:

>I've been working on a project to implement traffic shaping
>to conform to 95th percentile billing including our X2Go virtual
>desktops. One of the challenges is prioritizing the interactive X2Go
>traffic (screen, keyboard, mouse) differently from bulk traffic like
>local share transfers, printing, and possibly sound.  I thought this
>would be trivial because of the SSH transport since SSH sets the
>minimize-delay bit for interactive traffic and the maximize-throughput
>bit for bulk transfers.

If a user has his own machine, he can of course do whatever he wants.
Second, if he can pass options to ssh, he can set the QOS type
arbitrarily, and even where that is not available for control, one
can still cause the openssh client to use interactive TOS marking for
bulk transfers, since secondary ssh channels (e.g. tunnels) do not
pass up the TOS mark.