How can I get my net interface Uplink/donwlink speed and save it to futher performance analysis?

I´ve looking for a way to do it via SNMP and have a couple of programs (netmeter, dunwatch) that show the chart I need but don´t allow me to save it to analize it later. I also tried analyze sniffer and it has a beautiful database interface, but it saves only network load and not uplink/downlink separatedly. I... mostrar más I´ve looking for a way to do it via SNMP and have a couple of programs (netmeter, dunwatch) that show the chart I need but don´t allow me to save it to analize it later. I also tried analyze sniffer and it has a beautiful database interface, but it saves only network load and not uplink/downlink separatedly.

I want this to check how good is the speed I´m getting from a wireless Internet Service.

Thanks!
Actualizar: I´m using windows XP and could handle technical answers. I have researched for a software to do it without success.
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