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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 ...
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  1. #1
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    Exclamation nslookup problem by Iptables


    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 ....

  2. #2
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    Please advise !!!

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

  3. #3
    Linux User cyberinstru's Avatar
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    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?


  4. #4
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    Many Thanks for reply ....

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

  5. #5
    Linux User cyberinstru's Avatar
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    Can u post ur rules here?


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

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