"Smart" Hubs

Brooks Davis brooks at one-eyed-alien.net
Fri Sep 9 13:44:00 PDT 2005

On Fri, Sep 09, 2005 at 01:28:49PM -0700, Mike Hunter wrote:
> On Sep 09, "Daniel Eischen" wrote:
> > On Fri, 9 Sep 2005, Arne Schwabe wrote:
> > > >I came in kinda late to this thread, but if you're trying to find
> > > >a hub/switch in order to sniff network traffic, then you can always
> > > >go for a switch that let's you monitor traffic on other ports.
> > > >I know the Cisco's will let you do this, but I'd be suprised if
> > > >you couldn't find it on some other cheaper switches.
> > > >
> > >
> > > Or if you have 3 nics, use if_bridge. Or buy a really expensive managed
> > > switch, which allows you to mirror ports, vlans etc.
> > 
> > Well, is $175.00 US expensive?  The Netgear FS726T can be had for
> > about that price, and according to Netgear's web site, will support
> > port monitoring.  A 24-port switch may not be small enough for you,
> > but if you look around enough, you might find something that is.
> I think it violates specifications, but how about a physical copper "tap",
> like a two-headed cable?  Has anybody ever tried something like this?
> Ethernet was designed in the days of shared media....

That would be what the link I posted earlier does.  With full-duplex
connections, you need two recieve lines to get traffic in both
directions, but it does in fact work.

-- Brooks

Any statement of the form "X is the one, true Y" is FALSE.
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