At the moment, we have DNS enabled for xenon only, so let's check that this works correctly before starting to reconfigure the remaining machines. We already know that the connection to the router is OK, but since we used an IP address rather than a host name, DNS wasn't required—we already knew the IP address, so didn't need to look it up. Now we will bring DNS into play to complete the test:
xenon# ping www.sun.com www.sun.com is alive xenon#
Good. DNS has managed to resolve the host name www.sun.com into the correct IP address and has successfully managed to ping it.
It's always nice when we can dig a little deeper into the details we are checking. For example, we don't really know that the nameserver was ...