changing to UDP protocol for classroom use

[jordi navas]

Ivan J Thomas wrote:
> 
> Hi all,
>         I'm looking for some comments on the feasiblity of modifying VNC
> to use UDP protocol instead of TCP.  The reasons for this are so packets
> can be broadcast in a classroom situation, with X number of student
> workstations (VNC Clients) viewing the instructor's screen.  Yes, I think
> this can be done with the existing TCP protocol, but when X gets too big
> the server will get swamped.  X can get as high as 70 in my case.  The
> boxes will be reasonably fast, running Windows NT and on a secure LAN.
>         I have searched the lists thus far, and no posts have really
> answered my questions.  Thanks in advance for anyone taking the time to
> reply.
>                                 Ivan Thomas
>                                 University of Pittsburgh
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I'm also working on an UDP-Multicast vnc for  a classrom (windows). We have had
some problems with buffer overrun at ethernet level when the screen changes on
800x600. This only happens when the screen cannot be compressed really much by
hextile (ther is a complex bitmap on the screen). Then, althought the windows
api says it has dropped data (sended) the ethernet level dosn't drop the data
throught the lan.

There are some libraries that implement a reliable multicast protocol and also
could try to program a protocol of your own.

Bye.
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