MY Private BInd DNS server not accessible to other

[onkie]

hey guys , i am working on fedora 10 and configured dns on my college lan which already has it's dns at 192.168.5.20 .So i configured my private dns server at 192.168.101.91 which is my ip too.And the domain name is the host name of my system for example server.onkie.com.MY dns port 53 is shown when i do nmap localhost but but doesnt show when i do nmap 192.168.101.91 .Also when tested my server on other computers on my lan with there primary dns as 192.168.5.20 and secondary as 192.168.101.91 they cant access my site at my system with the name server.onkie.com .
nmap localhost

Starting Nmap 5.00 ( http://nmap.org ) at 2009-09-22 21:24 IST
Interesting ports on onkar (127.0.0.1):
Not shown: 993 closed ports
PORT STATE SERVICE
22/tcp open ssh
53/tcp open domain ----the dns is running
80/tcp open http
111/tcp open rpcbind
3306/tcp open mysql
8080/tcp open http-proxy
10000/tcp open snet-sensor-mgmt


And when i do

nmap 192.168.101.91

Starting Nmap 5.00 ( http://nmap.org ) at 2009-09-22 21:24 IST
Interesting ports on server.onkie.com (192.168.101.91):
Not shown: 994 closed ports
PORT STATE SERVICE
22/tcp open ssh
80/tcp open http
111/tcp open rpcbind
3306/tcp open mysql
8080/tcp open http-proxy
10000/tcp open snet-sensor-mgmt

cant find my dns server here ..

I already disabled my selinux and iptables ..but then also it's not accessible in Lan .Any help would be appreciated ..thanx in advance