Many of the cable providers have their own initial test they start with, http://www.timewarnercable.com/en/support/speed-test.html http://www.timewarnercable.co

Many of the cable providers have their own initial test they start with, http://www.timewarnercable.com/en/support/speed-test.html http://www.timewarnercable.com/en/support/speed-test.html as an example. Gives you overall up and down speeds at least within their network. For overall testing I also use http://www.speakeasy.net/speedtest/ http://www.speakeasy.net/speedtest/ Then separately, if you need local network testing you can use wireshark to help track down specific issues. My local wi-fi router also has tools that monitor the network performance, bandwidth usage and each IP's usage as well as breaks out failed packets to give you an error rate etc. At least those are a decent start.