RES: Sniffer - How's the best way to deploy ?

["Ricardo Perin" <ricardop () locaralpha com br>]

I haven't sure if ethereal supports PLC network, I think not.

Some switches have a port called PROBE PORT that is used exactly for this.
All the traffic in the network passes through him. I don't know if Cisco
call this port with other name, but....

Ricardo Perin
 

> -----Mensagem original-----
> De: Lukasz Szmit [mailto:lukasz.szmit () ucd ie]
> Enviada em: quarta-feira, 12 de julho de 2006 08:53
> Para: marcioacosta () gmail com
> Cc: security-basics () securityfocus com
> Assunto: Re: Sniffer - How's the best way to deploy ?
>
> Hi Marcio,
>
> >  Our first step is to isolate the PLC possible issue, so we will deploy
> a sniffer on the Switch 2955 that this PLC network is connected to. To do
> that were going to put a desktop with Ethereal installed on one of empty
> port on this switch and mirror the PLC switch port to the desktop switch
> port.
> >  My doubt is: How
> > s the best way to do it ?
> >
> >  -  I think this desktop must have two NIC, one with no ip configuration
> and other with ip configuration and also connected to another port that we
> can collect the data
>
> You would need only one NIC, put into promiscious mode and listening for
> traffic on a spanned (monitor session) port. This way you should capture
> all data flowing between both endpoints.
>
> > -  Whats the best sniffer to harvest this kind of data? Ethereal?
>
> If you're on Unix/Linux tcpdump or ethereal are the best choice, under
> Windows you probably won't find anything better than ethereal.
>
> > -  Hows the best way to log this data? Is there any software for Windows
> to do it?
>
> Well, with ethereal you can save the capture in libpcap format and than
> analyze it whenever it suits you - both with tcpdump and ethereal.
>
> regards,
> --
> Lukasz Szmit
> University College Dublin
>
>
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