I think you need to add the "." after the oct4doom1.com on this line, like this:
You should also check your /var/log/messages file for any named errors when you restart named. There could be a file location problem too.Code:oct4doom1.com. IN A 192.168.0.100
Also, try to use the "dig" and "host" commands to help with troubleshooting. It will give a good idea of what the DNS server actually thinks it's doing based on the contents of the zone file.