DNS Debian

Bonjour,
J'ai un prob avec mon DNS, ça ne fonctionne toujours pas.
3° tuto que je suis et toujours l'echec.
Nom de domaine: testganesha.lan
dans firefox je tape "ns.testganesha.lan" et ça me retourne un 404.
Je n'y connait pas grand chose en DNS. Est-ce correct comme test de mettre ça dans l'URL?
Merci a vous si vous trouvez le probleme.

Voici les 3 fichiers modifiés:

// This is the primary configuration file for the BIND DNS server named.
//
// Please read /usr/share/doc/bind9/README.Debian.gz for information on the
// structure of BIND configuration files in Debian, *BEFORE* you customize
// this configuration file.
//
// If you are just adding zones, please do that in /etc/bind/named.conf.local

include "/etc/bind/named.conf.options";

// prime the server with knowledge of the root servers
zone "." {
type hint;
file "/etc/bind/db.root";
};

// be authoritative for the localhost forward and reverse zones, and for
// broadcast zones as per RFC 1912

zone "localhost" {
type master;
file "/etc/bind/db.local";
};

zone "127.in-addr.arpa" {
type master;
file "/etc/bind/db.127";
};

zone "0.in-addr.arpa" {
type master;
file "/etc/bind/db.0";
};

zone "255.in-addr.arpa" {
type master;
file "/etc/bind/db.255";
};

zone "testganesha.lan" {
type master;
file "/etc/bind/db.testganesha.lan";
};

zone "18.168.192.in-addr-arpa" {
type master;
file "/etc/bind/db.192.168.18";
};



// zone "com" { type delegation-only; };
// zone "net" { type delegation-only; };

// From the release notes:
// Because many of our users are uncomfortable receiving undelegated answers
// from root or top level domains, other than a few for whom that behaviour
// has been trusted and expected for quite some length of time, we have now
// introduced the "root-delegations-only" feature which applies delegation-only
// logic to all top level domains, and to the root domain. An exception list
// should be specified, including "MUSEUM" and "DE", and any other top level
// domains from whom undelegated responses are expected and trusted.
// root-delegation-only exclude { "DE"; "MUSEUM"; };

include "/etc/bind/named.conf.local";


2° FICHIER MODIFIE:
$TTL 3h
@ IN SOA ns.testganesha.lan. benjamin.testganesha.lan. (
2009012001
8H
2H
1W
1D )

@ IN NS ns.testganesha.lan

ns A 192.168.18.141
client1 A 192.168.18.142


3° FICHIER MODIFIE:
$TTL 3h
@ IN SOA ns.testganesha.lan. benjamin.testganesha.lan. (
2005012001
8H
2H
1W
1D )

@ IN NS ns.testganesha.lan.

$ORIGIN 18.168.192.in-addr-arpa.
141 IN PTR ns.testganesha.lan.
142 IN PTR client1.testganesha.lan.