TCP/IP and NBT configuration parameters for Windows XP
set MTU size to the same or lesser than the router along the tracert with the smallest MTU allowed.

Find the smallest MTU allowed in the route by process of elimination using:
ping -l ____ -f

(-l = lower case L and means to use ____ packet size, -f means do not fragment.)

I found:
1413 and greater => "needs fragmented" response
1412 - 1395 => timeout response
1394 and lower => response received.
XCON: Site Connector and RPC Communication Within Sites Over a VPN
How to force Kerberos to use TCP instead of UDP in Windows Server 2003, in Windows XP, and in Windows 2000



I often want to look at how ports are configured on a switch, the descr, what vlan, etc.
"show run | include" type commands don't really help because the port config is on multiple lines.

The following are very useful, if only I could remember them:

show int status
show int summary