Ethernet in Promiscous and Non -Promiscous Mode

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December 2nd, 2004, 08:31 AM

zaheer031

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Ethernet in Promiscous and Non -Promiscous Mode

Hi,

Sorry if the question has been answered before
I want to know what happens when Ethernet is configured in Promiscous and Non -Promiscous Mode . Which are the data that are to the ethenet available in these two modes

Thanks and Regards,

December 2nd, 2004, 11:12 AM

juniperr

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By default the NIC is setup in non-promisuous mode meaning it will filter all packets that are not sent to its MAC address except for broadcast and multicasts, In promiscuous mode the NIC will bypass the hardware filtering and allow all traffic to come into the machine whether it was intended for that machine or not. remember a NIC uses MAC addresses to comunicate on the local LAN which is why you see ARP requests like crazy LOL, So if you where a hacker you would break into a network and but someones NIC into promiscuous mode and sniff the data (again in promiscuous mode the NIC accepts data that was not intended for that machine). to break this you use a switch so it will not even send it to the NIC in promiscuous mode that is why they invent ARP poisoning LOL.

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