TCP Optimizer = MaxMTU tester only(for me), it's optimized settings(MaxMTU=1492) on XP DSL PPPoE no good imho, XP PPPoE MaxMTU=1488, RAS PPPoE MaxMTU=1492. i'll stay with Windows default settings or Dr.TCP for my dialup DSL connection. Nice guide, but most lazy ppl who didn't read/search would like to have a simple lookup table.