OVDC and MTU

A few years ago I wrote about the "Importance of MTU" as it pertains to Sun Ray clients.  Things changed with the Sun Ray and in most circumstances, we can detect and adjust the Path MTU accordingly.  While the Oracle Virtual Desktop Client (OVDC) is designed to be just like a physical Sun Ray, for various reasons it currently lacks the Path MTU Discovery (PMTUD) code.  In short, what's old is new again..Or is it what's new is old again.  Either way, you need to set the MTU for the best experience (improper MTU demo video below).

You can set the MTU with a slider from the network tab:

Unfortunately the slider isn't as precise as you might need it and seems to jump in blocks ranging from 6-8 (i.e. try to set yours like mine with an MTU of 1333 and good luck!).  If somewhere within that range lies the your value, you can use the command line to set a precise MTU.  Simply run the vdc command with the --mtu argument.

For Windows:

C:\\Program Files\\Oracle\\Virtual Desktop Client\\vdc --mtu 1333

For OS X:

/Applications/Oracle Virtual Desktop client.app/Contents/MacOS/vdc --mtu 1333

The MTU setting is sticky and will stay for all subsequent connections, unless of course you use the slider and change it.

Quick (no audio) Video of what an improperly set MTU looks like:

Comments:

Hi Craig,

Just wondering if you're aware of any documentation that outlines all of the command line arguments for SDAC/OVDC for us to create pseudo kiosks from XP boxes.

Cheers,

Kim

Posted by kmount on August 24, 2010 at 05:23 AM PDT #

Hi Kim,
Kiosk session are a matter of policy, not anything controlled by the OVDC. Are you just looking for ways/options to start the client?

http://wikis.sun.com/display/OVDC2dot0/Running+OVDC+From+the+Command+Line

If I were going to take an XP box and turn it into a Sun Ray, I would:

1) Configure XP to autologin
http://support.microsoft.com/kb/315231

2) Change the default shell via GPO (so I didn't have to visit the PC to hack the registry)
http://msdn.microsoft.com/en-us/library/aa479087.aspx

And have that call a WSH script that launched the OVDC full screen to the Sun Ray Server(s).

Posted by ThinGuy on August 24, 2010 at 07:12 AM PDT #

Hi Craig,

Sorry I was very unclear last night! Yeah, effectively just looking for a list of options to make it full screen, etc.

Cheers,

Kim

Posted by kmount on August 24, 2010 at 04:22 PM PDT #

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