nslookup problem by Iptables

[saurabh1980]

Hi ,

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

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 ....

[saurabh1980]

If any other info required please let me know !!!

[cyberinstru]

1. Check that if you have allowed traffic to and from your loopback interface (lo)?

2. Check if you have rule to ACCEPT protocol UDP and DST PORT 53?

[saurabh1980]

Many Thanks for reply ....

I tried both the things but error is same ....

[cyberinstru]

Can u post ur rules here?


Coz it looks like more of a config issue with ur FW