Iptables problem

[Saurabh Mehrotra]

---------- Forwarded message ----------
From: Saurabh Mehrotra <saurabh1980 at gmail.com>
Date: Mon, 22 Jan 2007 21:29:46 +0530
Subject: Iptables problem help required !!!!
To: netfilter at lists.netfilter.org

Hi ,

I am using Red Hat Enterprise Linux AS release 4 (Nahant Update 3) with
Kernel 2.6.9-34.ELsmp #1

I am using Iptables for firewall .

But without firewall I m able to nslookup my own DNS server but whenever I
enabled firewall I am not able to nslookup to my own system.

And log files shows the following entry .

RULE 0 -- ACCEPT IN=lo OUT= MAC=00:00:00:00:00:00:00:00:00:00:00:00:08:00
SRC=127.0.0.1 DST=127.0.0.1 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=15607 DF
PROTO=TCP SPT=46994 DPT=25 WINDOW=32767 RES=0x00 SYN URGP=0
Jan 22 15:52:01 trench1ams crond(pam_unix)[13126]: session closed for user
root

EVEN This rule 0 is also accept rule for SSH not for deny...


I have added rule to accept my own system  traffic ...to allow any service
but still tje proble, is same ....


root at trench1 ~]# nslookup trench1
Server:         212.165.108.4
Address:        212.165.108.4#53

*** Can't find trench1ams: No answer


Please advice me how can I overcome with this problem .......


Thanks

Saurabh