Hello, all. 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. Thus we could distinguish the packets by looking at the TOS bits. This is how the default Linux pfifo_fast qdisc does it anyway.
I took a packet trace just to confirm it and, to my horror, I see that we are not setting any of the TOS bits and thus not prioritizing interactive traffic even with the default traffic shaping.
I'm guessing this is a casualty of moving to libssh. Is there any way to set the TOS bits for interactive to 0x10, bulk to 0x08 as it is in OpenSSH?. It would be really nice if sound could be configured either way according the the administrator's preference. Unfortunately, I did not see anything in the libssh documentation to show how to do this although I do not claim to understand it.
This is a critical issue for any WAN based deployments like ours. Thanks - John