lightdm: ssh / rdesktop / no enription

[Stéphane Graber]

On 02/08/2012 12:44 PM, Valerio Pachera wrote:
> Hi all, I wish ltsp client to NOT use encryption to lower the cpu usage.
>
> I read
> http://manpages.ubuntu.com/manpages/lucid/man5/lts.conf.5.html
> it's possible to do that by the option LDM_DIRECTX to set in the file
> /var/lib/tftpboot/ltsp/i386/lts.conf
> 1) How can I check and see it the ltsp client is realy not using encription?
>
> I noticed in edubuntu 11.10 is possible to select "rdesktop" or "ssh"
> like backend.
> 2) I have no clear if that has anything to do with the LDM_DIRECTX.
> May you tell me more about rdesktop and ssh choise?
>
> By the way, choosing rdesktop the client fails to log in.
>

Hi,

rdesktop is an RDP client for Windows Terminal Server (mostly), so you 
probably don't want to use that :)

Indeed using:
[default]
LDM_DIRECTX=True

In your lts.conf should do the trick, you can confirm it by looking at 
the value of "echo $DISPLAY" from a terminal started on one of you thin 
clients.

If it contains something like "x.x.x.x:Y" where x.x.x.x is the thin 
client IP, then you are using the non-encrypted X protocol, if you see 
something like "localhost:Y" (I think), then it means it's going over 
SSH and so is encrypted.

-- 
Stéphane Graber
Ubuntu developer
http://www.ubuntu.com