LDM_DIRECTX=yes by default?

monteslu at cox.net monteslu at cox.net
Thu Jul 3 19:14:44 UTC 2008

I found that on edubuntu 7.04 I could not get thumbdrives working on thin clients when LDM_DIRECTX was set to yes, however performance of tunneling everything through SSH was just awful. Anything with the slightest amount of animation was choppy.

I'd say make the default LDM_DIRECTX=yes, but make sure that local devices still automatically mount and popup nautilis/dolphin on the thin clients.


---- Warren Togami <wtogami at redhat.com> wrote: 
> The current default of LTSP5 is to tunnel *everything* from the ldm 
> login session through an ssh tunnel.  This increases security a lot, but 
> decreases usability of the default configuration since it scales very 
> poorly.  For example, a server that might be able to handle 40 clients 
> with LDM_DIRECTX=yes might handle only ten with everything through the 
> ssh tunnel.  (These are made up numbers.)
> If lts.conf has LDM_DIRECTX=yes, then the login and password is 
> encrypted by ssh, but X is unencrypted over the network.  This makes the 
> desktop performance a little better, but more importantly it allows the 
> LTSP server to scale to a similar number of simultaneous clients as the 
> old XDMCP-based LTSP4.2.
> This is bad for security, but if our goal is to have something usable 
> out-of-the-box in a similar fashion to how K12LTSP was, then perhaps we 
> should do it?
> How do people feel about this?
> Warren Togami
> wtogami at redhat.com
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