Re: promicuous mode and sniffer

From: Bill Unruh (unruh@string.physics.ubc.ca)
Date: 12/24/02 

From: unruh@string.physics.ubc.ca (Bill Unruh)
Date: 24 Dec 2002 00:46:29 GMT

determine99@aol.com (Determine99) writes:

]What is promiscuous mode and what is a relation between promiscuous mode and
]sniffing? Thanks in advance for explanation.

In promiscuous mode, your ethernet card will let through all traffic on
the net, including traffic not directed to the MAC address of the
machine itself. Ie, in this mode, all traffic gets read by the ethernet
card and is available for perusal by the system on that computer. Under
non-promiscuous mode, only those packets actually addressed to that
particular ethernet card are saved by the hardware on the card and
passed on to the system.
Most operating systems only allow root or administrator to change a card
into promiscuous mode. Of course with OS which have no such concept as
root, (DOS, Win 9x,...) anyone can put the card into promiscouos mode.
This means that that computer can read all traffic on that branch of the
network.

Relevant Pages

  • RE: Network Card Promiscuous Mode
    ... Second to make windows run the card in promiscuous mode use winpcap. ... to facilitate one-on-one interaction with one of our expert instructors. ... Attend a course taught by an expert instructor with years of in-the-field ...
    (Security-Basics)
  • Re: Promiscuous Mode
    ... promiscuous mode is a configuration of a network card ... Each packet includes the hardware address. ... a network card receives a packet, it checks if the address is its own. ...
    (Pen-Test)
  • Re: Is promiscuous mode bad?
    ... Promiscuous mode means the network card sends all traffic received to the ... packet sniffers to sniff network traffic without needing root privs on ...
    (freebsd-questions)
  • Re: snoop
    ... > there is security problem ... Promiscuous mode is a mode supported by most network cards where the card will ...
    (freebsd-questions)
  • Re: Promiscuous pcmcia network card
    ... Subject: Promiscuous pcmcia network card ... promiscuous mode is rare. ... as root, since only they can put the NIC in ...
    (Security-Basics)
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