Question : Ping command returns "request timed out" when buffer size is increased

I am trying to get ideas of what might be causing "request timed out" from pinging my SBS 2003 server with an increased buffer size.

I can ping my server successfully with the standard ping command. But when I use ping -l (50000 -64000) I start getting the timed out messages.

I have ISA 2000 firewall on this server. This is the only computer with this issue as I have pinged other PC's with the same command and received responses.

So I am wondering if this might be a NIC, cable, firewall or other software issue, as I know it is not the switch.

Any thoughts?

Answer : Ping command returns "request timed out" when buffer size is increased

TcpWindowSize is a  TCP/IP setting in Windows defining buffer size which holds incoming packets. TcpWindowSize is  set in the Registry. Its location is HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\ Parameters\Interfaces.