If you are using windows goto start > run then type cmd and hit enter. This will take you to the command prompt. Type ipconfig and press return.
Make a note of the Default Gateway address, this will be your routers LAN ip address. Test the connection between your pc and the router by running an extended ping to this address.
ping (i.e 192.168.0.1) -t
make a note of the response times, they should be around 10ms.
Now run an extended ping to the web, i suggest using bbc's web site. Type ping 212.58.224.36 -t and press return. This will do a continuos ping to the bbc and you need to check the time each ping is taking in milliseconds. To end the ping press ctrl-c. Now retry the same test using the domain name (ping www.bbc.co.uk -t). This will test the response via the DNS servers you are using.
You can also run a trace route to see if there are any slow hops as this could highlight a problem. This will show every hop (router) the packet passes through on the way to its destination and the time taken.
tracert 212.58.224.36
If you have a router and can access the config page you should check the connection status. You need to check the Noise Margin and Attenuation levels as these can affect connection. A very low noise margin (below 8.5dB) or high attanuation (over 65dB) can affect service. It will depend though on what flavour of dsl you have, dsl max can tolerate slightly worse readings than IP Stream (ADSL).
DC, January 2008