ping to your address won't tell you something interesting because it does that to your network card...
try /sbin/ifconfig and check if you have the loopback running like this:
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:5345 errors:0 dropped:0 overruns:0 frame:0
TX packets:5345 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
if you don't see it try restarting your box or check your nsd.tcl as Paul suggested!