DNS service check

Hi,
I installed leopard server 10.5 on a macmini. I have 1 imacclient.
After 2 unsucessful standard installations, I found some very good tutorials on forum and internet. I just completed my 3rd installation.
I did start DNS, AFP, DHCP and Direct Directory at the moment.
I performed sanity check on my serveur to make sure that DNS is working well.
I ran on Serveur Terminal the 4 following lines.

DNS= miniserveur.famillecolnot.col
IP of the serveur= 192.168.1.70
Serveur name miniserveur.

1. Host name, I have miniserveur.famillecolnot.col appears so =>OK
2. Host 192.168.1.70, I have host 70.1.168.192 in addra arap not found => Not OK
3. Host miniserveur.famillecolnot.col, I have host miniserveur.famillecolnot.col.domain not set.invalid not found => not OK
4. Sudo changeip -checkhostname. => that matchs ???

I check on my client using directory utility and I have the message « Serveur is responding normally ».

My questions are:
1. Does my DNS set up work normally (2 good message out of 4 checks) ?
2. How get ride of the error messages?

Thanks in advance.
JwColt