Here is what I came up with:

PING 72.232.180.133 (72.232.180.133) 56(84) bytes of data.
64 bytes from 72.232.180.133: icmp_seq=1 ttl=48 time=51.4 ms

knoppix@Knoppix:~$ ping knoppix.net
ping: unknown host knoppix.net


Also I tried typing http://www.knopper.net/knoppix/ directly into the browser and I got the same error message. So I guess its a DNS problem? Excuse my ignorance, but what exactly is that and what are the remedies?