Re: Is it really a HUB?

[Rich Adamson <radamson () routers com>]

> On Fri, Oct 24, 2003 at 06:00:41PM -0700, Craig Paterson wrote:
> > I ran into exactly the same problem with cheap Linksys hubs which turned 
> > out to behave as switches. I can't speak for that particular 3Com, but 
> > I'm using a four-port Officeconnect as an IDS hub, and it works great.
>
> Ensure they are not in fact "10/100 hubs". If so, they are actually made up
> of a 100M hub + a 10M hub joined via a 2-port switch. The outcome of which
> is that if you have (say) 3 100M Ethernet devices plugged into it, and 1 10M
> device, then the 3 100M devices can "see" each others traffic (like a hub
> allows) - but they cannot see the 10M traffic.
>
> i.e. check you Ethernet device settings and ensure they are identical - same
> speed and same duplex. Then see if it starts acting like a hub.

And, the exact same response can be seen from lots of not-so-cheap hubs
as well. I've got a 24 port 3Com Dual Speed Superstack II that does it,
just like an old Netgear 4-port dual-speed "hub". Get caught on it fairly
regularily. :(

Rich




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