Re: Home networking lab
From: Dimitri Maziuk (dima_at_127.0.0.1)
Date: 06/18/04
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Date: Fri, 18 Jun 2004 16:24:03 +0000 (UTC)
Cheryl sez:
> Hi all;
>
> From the previous posts I've read I think I know the problem but would
> like to verify.
>
> I have a home network set up as follows
>
> Cable -----sniffer 192.168.0.100
> Modem-------->Dlink Router-----Linksys Hub/-----server 192.168.0.102
> \-----laptop 192.168.0.101
>
> My sniffer is only capturing packets directed at or eminating from the
> host it is on (FreeBSD 5.2). It also catches broadcasts and arp
> requests. It sounds like my hub may actually be auto-switching, but I
> can't find any technical specs to verify this.
>
> Do I need to replace this hub with a single-speed (10 mbps) hub? Is
> there anything I should check? when i run tcpdump it says the
> interface is in promiscuous mode, but still only captures traffic
> directed to the box.
Some switches let you set up monitoring port to get around this.
If yours doesn't, you can set up the sniffer as transparent bridge
and put it between the hub and router (and also do packet fitering
there). OpenBSD has bridging built-in, I assume FreeBSD does too.
Otherwise yes, you'll need either a non-switching hub or a switch
that can do monitoring port.
Dima
--
... with the exception of January and February 1900, all Microsoft application
libraries counted dates the same way.
-- An Interview with Joel Spolsky of JoelonSoftware
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