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  1. #1
    Just Joined!
    Join Date
    May 2003
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    vijayawada
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    ethereal... how does it work..


    I know it turns the NIC into promiscous mode and sucks all the information and displays them. But, my question is how to set a NIC to promiscous mode . . . . . . the implementation concept!!
    Thats all

  2. #2
    Linux Newbie
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    Apr 2003
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    UK, Manchester
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    147
    ifconfig <interface> promisc

    That turns the <interface> to promiscuous mode.
    I would guess that ethereal does it a lower level than that though.

  3. #3
    Linux Guru
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    Oct 2001
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    Täby, Sweden
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    -->
    Ethereal probably uses the same socket ioctl that ifconfig does. However, it is important to note that promiscuous mode isn't what you use to suck packets from the interface; for that you mainly just use a raw socket. Promiscuous mode enables the NIC to pass all packets through to the kernel, even those that wasn't intended for your MAC address. That means that if you're using a switch, promiscuous makes no difference, but if you're using a hub, you can listen to other computers' conversations as well.

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