problème de configuration de BIND

[AYA belle]

hello everybody;
i'm new in the world of linux, so i have installed redhat 9.0 and i've 
configured the BIND this is my named.conf
## named.conf - configuration for bind
#
# Generated automatically by redhat-config-bind, alchemist et al.
# Any changes not supported by redhat-config-bind should be put
# in /etc/named.custom
#
controls {
        inet 127.0.0.1 allow { localhost; } keys { rndckey; };
};

include "/etc/named.custom";

include "/etc/rndc.key";

zone  "localhost" {
        type master;
        file  "localhost.zone";
};


zone "bmce.co.ma" {
        type master;
        file "/var/named/bmce.co.ma.hosts";
        };

zone "30.172.in-addr.arpa" {
        type master;
        file "/var/named/172.30.rev";
        };

the result of th dig commad is

[root at srvlinux bin]# dig @srvlinux bmce.co.ma any

; <<>> DiG 9.2.1 <<>> @srvlinux bmce.co.ma any
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4426
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

;; QUESTION SECTION:
;bmce.co.ma.                    IN      ANY

;; ANSWER SECTION:
bmce.co.ma.             38400   IN      SOA     srvlinux.bmce.co.ma. 
root.srvlinux.bmce.co.ma. 1085476696 10800 3600 604800 38400
bmce.co.ma.             38400   IN      NS      srvlinux.bmce.co.ma.

;; ADDITIONAL SECTION:
srvlinux.bmce.co.ma.    38400   IN      A       172.30.4.94

;; Query time: 5 msec
;; SERVER: 172.30.4.94#53(srvlinux)
;; WHEN: Tue May 25 11:44:09 2004
;; MSG SIZE  rcvd: 108

the result of the commad host

root at srvlinux bin]# host -a srvlinux
Trying "srvlinux.bmce.co.ma"
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 61251
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;srvlinux.bmce.co.ma.           IN      ANY

;; ANSWER SECTION:
srvlinux.bmce.co.ma.    38400   IN      MX      10 pop.bmce.co.ma.
srvlinux.bmce.co.ma.    38400   IN      MX      10 smtp.bmce.co.ma.
srvlinux.bmce.co.ma.    38400   IN      A       172.30.4.94

;; AUTHORITY SECTION:
bmce.co.ma.             38400   IN      NS      srvlinux.bmce.co.ma.

Received 108 bytes from 172.30.4.94#53 in 5 ms

i think the sever is well running but the problèmes is when i tried to ping 
from a windows 98 client to the server it doesnt work , i dont know why , if 
someone could help me thanks a lot

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