We could directly start at Layer 3 and use ping. If that's ok, there's probably an upper-layer issue. There could also be a DNS problem, I've already discussed it in my day 17 post.
Follow these steps on a Windows machine to verify the DHCP operation:
- Enter the command ipconfig /all in a command box. It should show lots of info like subnet mask, gateway, DNS server(s) and IP address.
- Are the gateway and host IP address on the same subnet?
- Release and renew the dynamic assignment with ipconfig /release and ipconfig /renew.
- If you can ping your gateway but no Internet address, there's a problem between your router and ISP (DNS, etc.). You could also use the tracert command (traceroute in IOS) to further investigate the issue.