It shure does help but there are few things I don't quite understand.
First,why must that entry in Host file have two domain names(if it gets IP from DHCP)?Couldn't it just have
127.0.0.1 mybox.mydomain.com mybox ;
and that's it?
Second,I thought you have to add an entry in /etc/sysconfig/network file even if machine gets it's IP from DHCP server?But that article indicates you only add an entry if you have static IP.
Anyways,thank you very much for that link