All things related to multicast

[Andrew Lee <>]

I may be mistaken, but I believe references to the TCP/IP stack in Windows XP
do not restrict itself to the TCP protocol, like a networking person would
think it would.  I am fairly certain if you were to change the registry key
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{Adapter
ID}\MTU
that the change would effect all IP protocols, not just TCP.

Mark Boolootian wrote:
> Folks,
> 
> We've got a problem with fragmentation (which is eating router CPU) over a 
> tunnelled multicast connection between several windows boxes running 
> netmeeting to do conferencing.  I'd like to drop the MTU on the windows 
> boxes to remedy this, but have so far been unable to figure out how to
> do this.  Everything I've found related to adjusting MTU appears to
> only affect TCP sessions, but UDP continues to use the MTU of the 
> interface.  
> Does anyone know if it is possible under Windows/XP to modify the physical 
> interface MTU?
> 
> thanks,
> mb
> ---
> Mark Boolootian
> UC Santa Cruz