LDM_DIRECTX=yes by default?

Darryl Bond dbond at nrggos.com.au
Thu Jul 3 21:42:51 UTC 2008

I agree, Most LTSP applications are on a protected LAN (or should be).
Encrypting X is a great idea if the traffic has to travel over an
uncontrolled network and should be available but need not be the default.

Losing the local devices is more of an issue.

Darryl Bond

Warren Togami 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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