9.2.4: You can cut right to Layer 3 and troubleshoot connectivity with ping. If the ping is successful, you have an upper-layer issue, and the IP addressing is OK for your host. An unsuccessful ping using a domain name followed by a successful ping using an IP address indicates an issue with DNS.
9.3.6: If your computer is configured to obtain an IP address automatically, you can follow these steps to check DHCP operation on a PC running Windows:
Step 1. Check the IP configuration on your host; open a command prompt and enter the command ipconfig /all. Look at the subnet mask, gateway, DNS settings, and IP address.
Step 2. Make sure that the gateway and host IP addresses are on the same subnet.
Step 3. Try releasing ...