Trouble with DNS set up

Hello !
I've got a real trouble with my dns configuration... and i can't understand! so, i need some help....
well, qutie newbie in mac os server, i run in on a G4, and i had not noticed any trouble until i've decided to run open directory as a master with LDAP, wanting to have a kerberos protection for the users.
Kerberos doesn't want to play with me !
I've been in console mode to have a look, and, actually i've seen this :
"Oct 17 11:31:08 wakan servermgrd: servermgr_dns: no name available via DNS for 192.168.0.109
Oct 17 11:31:08 wakan servermgrd: servermgr_dns: no reverse DNS entry for server, various services may not function properly"
Ok... my DNS has a trouble... but i don't know how to fix it ! Is there anybody in this world who can help me?
I don't want to have a real DNS for my little server... but i understand that my config is not good. I can understand that having a caching DNS can improve the quality of my config, and, in other hand that it is necessary for having the services of OSX server in an effeciant way, but i don't know the way and the parameters i've to put in my config to fix it.
Now, just some words on my config...
First, i've got an adress provided by my FAI (the frenchy workd for ISP, i think) is "193.252.209.135". This adress is set on a d-link modem router via PPOE. The DNS of my provider (wanadoo.fr) are 80.10.246.1 and 80.10.246.132.
After this there is my G4 With mac osX server.
• en0, the "extenal gate" and the internal ethernet on the computer is plug on the modem with the adress "192.168.0.109". the router is set on "192.168.0.1". the dns are 80.10.246.1 and 80.10.246.132.
• en1, the "internal gate" for the network, an PCI card in the computer, has the parameters : adress "192.168.3.1", subnet "255.255.255.0", router "192.168.3.1". no dns records. (no VPN service for the moment). After this, i've a switch for the macs behind the server. (without any link agregation)
All those parameters have been set by the gateaway assistant.
And now the parameters inside the admin server :
DHCP : en1 - adress from 192.168.3.2 to 192.168.3.254, name 192.168.3. no static card. Router 192.168.3.1. No name for domaine by defaut, name servers 80.10.246.1 and 80.10.246.132 No LDAP, no WINS.
DNS : No zone transfert, recursivity is ON. No zone records.
NAT : set on full, Transfert and Network Address Translation.
When i've been on the terminal, i had those information:
"wakan:~ st$ sudo changeip -checkhostname
Password:
Primary address = 192.168.0.109
Current HostName = wakan.local
The DNS hostname is not available, please repair DNS and re-run this tool."
All my "main" services are working fine (AFP, Firewall, DHCP, DNS, Update) Open Directory is running without Kerberos. By the way, all the macs after the G4server can have a corect access to internet, and share information via LDAP of Open Directory, but i've to say that, a couple of days later, a friend of mine, who has a PC computer, can't have a DHCP dynamic address when he plug on my little network. I think that it is an other trouble, and i've decided to have e look to this later... but if someone knows how to resolve it...
So here begins the nightmare for me... so if anybody can help me... i realy need some help to fix this mystery!!!
Special thanks!

As the router modem is already doing NAT why use NAT in the server?
If you want to use OpenDirectory and other services you should/need to set up the DNS correctly using the server's private IP (and others in the same range the server is setup with). The domainname used internally can be different than your public one.
And then use the server as the only DNS for you LAN clients and the server itself. Forwarders (your ISP DNSes) in /etc/named.conf usually speeds up lookups of external addresses (also turning off IPv6 can help that too).

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Puppa wrote:
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