RE: port forwarding with IP TABLES - bad argument

Vincent_Valdez_at_Dell.com
Date: 09/25/03

  • Next message: Sean Estabrooks: "Re: Kernel Update - if it's not broke do I fix it?" 
    To: redhat-list@redhat.com
Date: Thu, 25 Sep 2003 13:01:42 -0500

    > -----Original Message-----
    > From: Noah [mailto:admin2@enabled.com]
    > Sent: Thursday, September 25, 2003 9:03 AM
    > To: redhat-list@redhat.com
    > Subject: port forwarding with IP TABLES - bad argument
    >
    > $IPTABLES -A PREROUTING -t nat -p tcp -d $EXTIP --dport 10700
    > -j DNAT --to
    > $PORTFWIP:10700
    <snip>
    > Bad argument `10700'

    Noah,

    That command should work, as long as the "$PORTFWIP:10700" is on the same
    line as everything else. Try executing it outside the script:

    #iptables -A PREROUTING -t nat -p tcp -d 10.0.0.1 --dport 10700 -j DNAT --to
    10.1.1.1:10700

    Of course, just replace 10.0.0.1 and 10.1.1.1 with your correct ips. If you
    get a command line, and no errors, (check the status with "service iptables
    status") then there may be something odd in the script.

    There may be a carriage return in the line somewhere, or one of the
    variables may not have a value. You can always duplicate the line in the
    script just before it executes for debugging purposes as such:

    --add to script before PORTFWIP line--
    echo This should be executed next: "$IPTABLES -A PREROUTING -t nat -p tcp -d
    $EXTIP --dport 10700 -j DNAT --to $PORTFWIP:10700"
    --add to script before PORTFWIP line--

    You should see the text followed by the actual line to be executed, with the
    variable's values. If any of the variables are empty, start troubleshooting
    it from there. 

    --
Regards,
Vinny Valdez
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