Re: half duplex

[Dietz Proepper <dietz@rotfl.franken.de>]

You:
> On Fri, Jul 29, 2005 at 10:13:41PM +0100, Lei Yu wrote:
> > I think the hub does support full duplex. It is netgear dual speed hub
> > model DS104.
>
> The hub is telling your eth0 that it doesn't - only half duplex (HD),
> at 100 Mbits or 10 Mbits.  To find out if it actually does FD, you can
> try forcing full duplex temporarily with "mii-tool -F 100baseTx-FD
> eth0". Watch the output from "ifconfig eth0" to see if the Errors or
> Collisions start going wild, which will indicate that the hub doesn't do
> full duplex.

Sorry to say this again - if it's a HUB it will never - never - never 
support  FD. Hubs generally only support HD links due to their design.

Switchs can and normally do support FD.

But this does not matter normally, the slowdown is acceptable, at least for 
SOHO and smaller kinds of setups.