SSH Compression

[David Groos]

Hi Jeff,

I'm thinking I hadn't understood what you were asking for--NX is an application to do remote access, like tight-vnc.  Sounds like you want to compress the video as it gets sent over the network as part of the normal LTSP thin client process.  Yes?

Compression is part and parcel of the LTSP thin client system, I think.  For questions like you are asking, I would recommend that you jump on some irc application like pidgin internet messenger and go to the #ltsp room and ask your question on line.  It is much more active than the #edubuntu room and it seems that most all of my questions seem to be about ltsp :-)  This list server has been kinda thin on answers lately.

Good luck on tracking down some satisfaction.
David

On Aug 29, 2011, at 5:10 AM, Jeff wrote:

> Thanks for the input, David.
> 
> Still getting my head around *NX. Can the client work from the thin-clients without loading a windowing system?
> 
> In the meantime, I found this article http://ubuntuforums.org/archive/index.php/t-368869.html about compression.
> 
> Looking around the configuration files I don't see any compression enabled in /var/lib/tftpboot/ltsp/i386/lts.conf so I've added:
> 
> ## SSH compression between LTSP client and server
> NETWORK_COMPRESSION = True 
> 
> remotely, but haven't been onsite to test it yet.
> 
> /var/lib/tftpboot/ltsp/i386/config-2.6.38-8-generic has several compression parameters, but nothing explicitly about SSH from what I can see.
> 
> Will post an update when I've had a chance to test.
> 
> Cheers,
> 
> Jeff
> 
> 
> 
> 
> On 24 Aug 2011, at 3:24 PM, David Groos wrote:
> 
>> Hey Jeff, Sounds like you are looking for good gui remote access over ssh? I use FreeNX as the server and use NoMachine's client and now also use OpenNX since it works well with lion-10.7.  The access over broadband internet is just like sitting at the computer--works great to manage remote servers running Edubuntu/ltsp.  I hear it is even a decent experience over dial-up.  So, while I don't know what the compression is, it must be pretty good to work this well in this situation.  If you have more questions, let me know.
>> David
>> 
>> On Wed, Aug 24, 2011 at 7:15 AM, Jeff <jeff at wildcoast.com> wrote:
>> Hi all,
>> 
>> I don't have easy access to a server at the minute, and not sure where the settings are anyway; but I've been wondering about this for a while and am just hoping that someone can point me in the right direction:
>> 
>> A week or so ago when I was onsite at a school, I ran a binary tcpdump to get an indication of network usage with approximately 12 thin clients working.
>> 
>> It wasn't a very precisely measured test or anything, but the server sent/received a Gigabyte of traffic in about a couple of minutes.
>> 
>> So I'm just wondering whether SSH compression is enabled by default or not? And if it is, whether there's any way to tweak it?
>> 
>> Also, it occurs to me that SSH compression would have to be lossless, by nature. So I'm wondering if there's any way to get something like tight-vnc working; or whether we should try a lightweight X desktop like XFCE?
>> 
>> I'm not really happy about the performance, compared to terminal server, for ex, or even the old Fedora/Gnome K12-LTSP we upgraded from.
>> 
>> Insights and pointers appreciated. Flames > /dev/null
>> 
>> ;-)
>> 
>> --
>> Jeff Brown
>> 
>> Tel:+27-74-101 5170
>> Fax:+27-86-532 3508
>> www.wildcoast.co.za
>> 
>> 
> 

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