We have an ISA 2006 behind a 512kbps internet gateway.
When using speedtest.net from a computer behind ISA to check internet speed, I am getting very long latency (about 1000ms) and very low bandwidth (about 100kbps DL and 20kbps UL).
For testing, I have disabled all access rules is ISA server except one allowing one PC, then made speedtest.net, I got latency 22ms only and speed about 420kbps.
After enabling other access rules again, internet speed stayed good, but going down by time.
How to know why internet is getting slow? Is there any real time tool to monitor what's happening in the bandwidth?