[PLUG] Sniffing networking traffic

Bryan Murdock bmurdock at gmail.com
Wed Oct 27 17:28:55 UTC 2004


On Wed, 27 Oct 2004 06:10:03 +0000, Vincent Yau <v_yau3 at hotmail.com> wrote:
> 
> Hi:
> 
> I have one linux box and a VOIP adaptor.  They are connected to
> the same hub, then to a cable modem router and then
> to my cable modem.
> 
> I want the linux box to be able to capture network traffic
> that is directed to the VOIP adator.  I have turned on eth0
> to promiscuous mode.  I tried running both
> tcpdump and ethereal.  Neither detected anything
> beyond what is meant for the Linux box.
> 
> It is my understanding that by putting the linux on a hub, and turning
> its eth0 to promiscuous, I should be able to detect
> all traffic going through on the same hub.
> Am I missing a step?
> 
> Thanks for any pointer.

I don't know, is the VOIP adapter turned on and really doing
something?  Plug something else into the hub and see if you can sniff
it's network traffic.

Bryan



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