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Thread: Problem with ettercap forwrding mitm & iptables

  1. #1
    Just burned his ISO BlownCPU's Avatar
    Join Date
    Jan 2009
    Posts
    7

    Default Problem with ettercap forwrding mitm & iptables

    Hi everyone,

    After reading several tutorials on this fantastic forum I can't seem to get ettercap working properly.

    I'm trying to test my network and trying to do the MITM attack which I fully understand how it works and what it does.

    Router = 192.168.1.1
    My PC = 192.168.1.2
    Host PC = 192.168.1.3 running WinXP

    I use the graphical interface although using this command gives me the same result:
    Code:
    ettercap -i wlan0 -Tq -M arp:remote /192.168.1.1/ /192.168.1.3/
    I'm using BT2 with a wireless connection, I am connected to the network (it's my network at home) and I have edited the /etc/etter.conf file by removing the "#" from the iptables section.

    The problem is when I exit the program I get this:
    Code:
    [bt ~]# iptables v1.4.1.1: can't initialize iptables table `nat': Permission denied (you must be root)
    Perhaps iptables or your kernel needs to be upgraded.
    This I'm sure is the reason why I am not forwarding any packets and I don't know what to do here.

    Here are my iptables -L:
    Code:
    bt ~ # iptables -L
    Chain INPUT (policy ACCEPT)
    target     prot opt source               destination
    
    Chain FORWARD (policy ACCEPT)
    target     prot opt source               destination
    
    Chain OUTPUT (policy ACCEPT)
    target     prot opt source               destination
    bt ~ #
    Here is my lmod | grep ipt
    Code:
    bt ~ # lsmod | grep ipt
    iptable_filter          2564  0
    ipt_REDIRECT            1920  9
    iptable_nat             6404  1
    nf_nat                 14764  2 ipt_REDIRECT,iptable_nat
    nf_conntrack_ipv4      13452  2 iptable_nat
    nf_conntrack           47848  3 iptable_nat,nf_nat,nf_conntrack_ipv4
    ip_tables              10968  2 iptable_filter,iptable_nat
    x_tables               11652  4 ipt_REDIRECT,xt_tcpudp,iptable_nat,ip_tables
    bt ~ #
    I have seen a few threads on this forum but one is unanswered and the other solution did not work for me.

    Any help is much appreciated.

    Cheers,

    Blown CPU

    PS My contribution to aircrack-ng is the tutorial making, describing and testing the "cantenna" have a look at aircrack-.org/doku.php?id=cantenna_directional_antenna_with_gain

  2. #2
    Just burned his ISO
    Join Date
    Feb 2009
    Posts
    2

    Default

    [privs]
    ec_uid = 0 # nobody is the default
    ec_gid = 0 # nobody is the default
    Try making that change to your etter.conf, I made the change on Ubuntu and it fixed the error message I was getting so maybe it could help you out.

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