installation blues

[RIMAN]

Sir,
I am trying to install zimbra 4.5 on centos 5.0 i am new to this stuff. The dns thing is my problem.

1. my /etc/hosts is: 192.168.0.10 mails.aptpensions.com mails

2. my internet is passed thr firewall that directs required traffic to this machine
3. other machines on the LAN have ip setting like this
ip ... 192.168.0.5
mask .. 255.255.255.224
gateway.. 192.168.0.129
dns ... 192.168.0.132 (this is the active directory for the LAN which has its own dns as 193.238.30.xx - external from isp)

pls how do i configure the DNS

[uxbod]

Why are you installing 4.5 and not 5.0.13 ? As you are behind a firewall on a private LAN you will need to setup a Wiki :: Split DNS architecture.