full-disclosure - Promiscious Device Detection

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Message-ID: <44101C5A.30600@hogyros.de>
Date: Thu Mar  9 12:15:42 2006
From: Simon.Richter at hogyros.de (Simon Richter)
Subject: Promiscious Device Detection

Hi,

Q Beukes wrote:

> I am looking for linux utility that checks if a specified machine's
> network device is in promiscious mode or not.

Technically, promiscuous mode only affects packet reception, so it is 
pretty difficult to detect; however most packet sniffers will not hide 
the packets that would have been filtered normally from the kernel, so 
the kernel should react to e.g. a ping or SYN packet that has the 
correct destination IP address for that host, but would normally be 
filtered by the MAC (e.g. with a different destination MAC address).

I don't have a readymade utility for that (I'd code it if need arises, 
but the days of Cheapernet are gone), but you can test from the shell by 
creating a static ARP entry using the arp(8) tool and then pinging the IP.

    Simon