Chuck Swiger wrote:
> Jeff_Lopes_at_groove.net wrote:
>
>> DSL Modem ---> Hub ---> Linksys Router ---> Internal Machines
>>
>> I then put a Linux machine on the hub and ran ethereal. No traffic!
>
> Do you have a real IP address from the DSL modem, or does your Linksys
> do PPPOE? If it's the latter, all of the IP traffic is being
> encapsulated within PPP-- ethereal should still see the traffic, but
> trying to match by IP addr will fail.
Or, your "hub" isn't really a hub. I've encountered a recent phenomena
where network equipment vendors are selling small devices marked as
"hubs" that are really switches. For most purposes this doesn't matter,
and in fact is just a free upgrade. But if you're trying to use the hub
as a network monitoring tap, you're SOL.
Test: put the hub on some other network that you *know* is carrying
normal IP traffic and see if you see anything.
Crispin
--
Crispin Cowan, Ph.D. http://immunix.com/~crispin/
Chief Scientist, Immunix http://immunix.com
http://www.immunix.com/shop/
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Received on Sep 15 2003
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