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  • 1.  iptables prerouting to redirect port

    Posted 03/19/20 02:47 PM
    Hi 
    I am trying to redirect traffic coming to 514 port to 517 only for source 10.0.0.198
    I am adding following line to file /opt/qradar/conf/iptables.pre

    -A PREROUTING -s 10.0.0.198/32 -p udp -m udp --dport 514 -j REDIRECT --to-ports 517
    I also tried to add line as;
    -t nat -A PREROUTING -s 10.0.0.198/32 -p udp -m udp --dport 514 -j REDIRECT --to-ports 517  
    -A PREROUTING -t nat -s 10.0.0.198/32 -p udp -m udp --dport 514 -j REDIRECT --to-ports 517 
    -A PREROUTING -s 10.0.0.198/32 -d 0/0 -p udp -m udp --dport 514 -j REDIRECT --to-ports 517

    When I tried to run /opt/qradar/bin/iptables_update.pl for all alternatives, the iptables service not starting with an error. When I remove the line from the iptables.pre file iptables service restarting as expected.

    QRadar: How to edit iptables rules in QRadar? 
    In this document "Another use of iptables in QRadar" section explain that we can redirect port but I can not made it.

    Could you please help me to solve the issue.

    The qradar-iptables.log file show the line.
    ------------------------------------------------
    iptables: Applying firewall rules: iptables-restore v1.4.21: The -t option (seen in line 23) cannot be used in iptables-restore.
    iptables.init[11336]: Error occurred at line: 23
    Try `iptables-restore -h' or 'iptables-restore --help' for more information.
    iptables.init[11336]: [FAILED]
    iptables.service: main process exited, code=exited, status=1/FAILURE
    Failed to start IPv4 firewall with iptables.

    ------------------------------
    Hasan Erhan AYDINOĞLU
    ------------------------------


  • 2.  RE: iptables prerouting to redirect port

    Posted 03/22/20 09:45 AM

    Create folder /opt/Qradar/conf/nat.pre

    Create file in the folder with your rules.

      -A prerouting -p tcp -s ip -dport …



    ------------------------------
    Qiao Xin
    ------------------------------



  • 3.  RE: iptables prerouting to redirect port

    Posted 03/23/20 02:12 AM
    Hi Qiao
    Thanks for comment.
    After I did what you offer iptables rules don't show the prerouting rule which I insert using nat.pre file..

    [root@qradar conf]# cat /opt/qradar/conf/nat.pre
    -A PREROUTING -s 10.0.0.198/32 -p udp -m udp --dport 514 -j REDIRECT --to-ports 517

    [root@qradar conf]# iptables -L -n -t nat
    Chain PREROUTING (policy ACCEPT)
    target prot opt source destination
    DOCKER all -- 0.0.0.0/0 0.0.0.0/0 ADDRTYPE match dst-type LOCAL
    Chain INPUT (policy ACCEPT)
    .....
    ...

    Any idea?
    Thanks


    ------------------------------
    Hasan Erhan AYDINOĞLU
    ------------------------------

    Original Message


  • 4.  RE: iptables prerouting to redirect port

    Posted 03/23/20 04:22 PM
    Is there any idea about the issue?

    Thanks

    ------------------------------
    Hasan Erhan AYDINOĞLU
    ------------------------------

    Original Message


  • 5.  RE: iptables prerouting to redirect port

    Posted 03/24/20 09:44 PM
    Create a file under the folder instead. You created a file using the folder name.

    i think you need to restart iptables

    ------------------------------
    qx
    ------------------------------

    Original Message


  • 6.  RE: iptables prerouting to redirect port

    Posted 03/25/20 09:27 AM
    Hi Qiao

    I did what you said.
    [root@qradar ~]# cat /opt/qradar/conf/nat.pre/iptables.pre
    -A PREROUTING -s 10.0.0.198/32 -p udp -m udp --dport 514 -j REDIRECT --to-ports 517
    [root@qradar ~]#

    And restart iptables using /opt/qradar/bin/iptables_update.pl
    When I check the prerouting tables I can not see the rule that I added.

    [root@qradar ~]# iptables -L -n -t nat
    Chain PREROUTING (policy ACCEPT)
    target prot opt source destination
    DOCKER all -- 0.0.0.0/0 0.0.0.0/0 ADDRTYPE match dst-type LOCAL
    Chain INPUT (policy ACCEPT)

    Is there any idea about the issue?
    Thanks


    ------------------------------
    Hasan Erhan AYDINOĞLU
    ------------------------------

    Original Message


  • 7.  RE: iptables prerouting to redirect port

    Posted 03/25/20 10:49 AM
    Hello! I don't know radar and I don't know why I should create an folder ! Whats going on here?



    ------Original Message------

    Create a file under the folder instead. You created a file using the folder name.

    i think you need to restart iptables

    ------------------------------
    qx
    ------------------------------


  • 8.  RE: iptables prerouting to redirect port

    Posted 03/25/20 02:53 PM
    Hi Qiao
    I think even it did not show the iptables rules it is redirecting traffic. I am now able to see the some events coming to port 517. But it should also show us in iptables -L -n -t nat command too.
    Thanks

    ------------------------------
    Hasan Erhan AYDINOĞLU
    ------------------------------

    Original Message


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