How is MTU size determined for Exchange 2000 sp3 on Windows 2000 sp4 server?   

We are having some performance problems across our VPN tunnels. One of the 
areas we are investigating is MTU size. Does anyone know how I can determine 
the size of the packets that our servers are producing ?


Mailbox server = Exchange 2000 sp3 on Windows 2000 sp4 server
and
Bridgehead server = Exchange 2000 sp3 on Windows 2000 sp3 server

Thanks,

Ken

date: Thu, 30 Mar 2006 13:10:14 -0500   author:   Ken Hack