I am trying to connect an XBox360 through an SBS2003/ISA2004 setup. If I connect the XBox360 to a 100mbps hub that is connected to the ActionTec MI424WR Router, it works great. There is not problem.
However, if I route the XBox360 through the unmanaged switch connected to the LAN NIC and the XBoxLive login is routed through unmanaged switch->LAN NIC -- ISA 2004 -- -> WAN NIC --> Router, I get an MTU test failure.
After researching, I find that the default MTU is 576 on a default installation of SBS2003 (which is too low for the XBox360). I found that the parameter EnablePMTUDiscovery=1 is supposed to discover/use a more correct MTU. I set the parameter to this value and then rebooted the system and got the same failure on MTU.
Question: How do I determine the MTU being used by the NICS on the SBS2003 server Question: How do I set/manage the MTU (I want to set it permanently to 1492 or 1500) on each NIC?
Any other information I need to know to solve this problem>
