Re: Re: [Ethereal-users] PPPoE

[<rlangford58@xxxxxxxxxxx>]

Ok, a network tap.  I can connect router output cable to one jack of this three-way, then cable from the second jack to the DSL modem.  This leave the third jack for my 4th PC.  When I build the connector for the cable to this 4th PC, I can omit connecting the transmit pair.  So, the 4th PC gets receive signals only.  I think that part will work.  I'm not sure whether I can actually get the 4th PCs network adaptor to process the bits (PPoE) never having done this b4.  BTW, I have a 4-port ethernet hub.  If I placed it between the router and DSL modem, would it work there ?  I could use my little 3-way RJ48 adaptor then for what it's intended for that being a test adaptor and not tie it up as a network tap.

Thanks!
RDL

>From: Ulf Lamping <ulf.lamping@xxxxxx>
>Date: Mon Feb 06 05:32:28 CST 2006
>To: Ethereal user support <ethereal-users@xxxxxxxxxxxx>
>Subject: Re: [Ethereal-users] PPPoE

>Bob Langford wrote:
>> Hello, - New list subscriber here.  I would like to capture traffic 
>> from three PCs at my home.  They are behind a Linksys BEFSX41 router 
>> which then connects to a Westel 6100 DSL modem.   If I placed a 4th 
>> PC, running Ethereal, in the path between the Linksys router and the 
>> DSL modem would I expect to get a good decode.  The protocol at that 
>> point is PPPoE.  I have a three-way RJ48 jack I could use for this.   
>> I'd lift the transmit pair from one end of the cat-5 cable going to 
>> this 4th PC so there wouldn't be any signal mixing into the router 
>> output from the PC.  
>>  
>> Would this work ? -
>I don't think so, you'll need four RJ48 sockets.
>
>What you're trying to do is to build a so called network tap.
>
>But you'll usually need both directions of the traffic between the DSL 
>modem and router.
>
>See: "Capture using a network tap" at 
>http://wiki.ethereal.com/CaptureSetup/Ethernet for more information.
>
>Regards, ULFL
>
>
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