The Wizard says the network and dependencies checks fail. I can fix the dependencies...minor oversight

However, I have never meddled with DNS...
Here is the contents of the log file:
...
2006-07-11 13:49:19,349 INFO System check start
2006-07-11 13:49:19,450 INFO Operation passed: Environment check passed.
2006-07-11 13:49:19,551 INFO Operation passed: Filesystem check passed.
2006-07-11 13:49:19,773 ERROR Operation failed: Network check failed -- Could not find a host name in DNS that matches an IP address
2006-07-11 13:49:19,775 ERROR Operation failed: Network check failed -- IP address associated with host name 'localhost.localdomain' is '127.0.0.1'
2006-07-11 13:49:19,874 INFO Network interface is eth0
2006-07-11 13:49:19,894 WARNING Operation warning: Network check warning -- network is configured for DHCP.
2006-07-11 13:49:19,895 ERROR Operation failed: Network check failed -- 127.0.0.1 line contains fully-qualified server hostname (localhost.localdomain) in /etc/hosts, please remove it
...
Are there directions, somewhere, that show examples of what the files should look like or what should be in those files?
Thanks,
Counsel