Paul and Steve,
Don't be deceived... There is absolutely a technical answer for this.
As we were discussing in another thread, a Hub does not have the
ability to support full-duplex connectivity. For full-duplex, you
absolutely need a switch. One of your devices (maybe both of them)
was attempting to communicate in full-duplex. The result was that it
was likely transmitting while another station had the medium (A shared
medium, in a hub). This produced a collision.
When you replaced the hub with a switch, the problem went away.
Paul, to verify that there is nothing wrong with either of your
ethernet cards, or with the hub you've just replaced, connect two
stations that have been manually configured for half-duplex, and do
some pinging or file transferring. Make certain that both stations
are set for half-duplex. Do not trust 'auto-negotiation.' It's a
nice idea, but in practice, it simply cannot be relied upon.
Best of luck,
Alan
----- Original Message -----
From: "Stephen Skinner"
To:
Sent: Monday, June 04, 2001 11:39 AM
Subject: Re: Problem with home network [7:6922]
> paul,
>
> you may just have been looking at a faulty hub.....i`ve seen some
strange
> things with hubs.....like being able to ping your gateawy but not
bieng
> able to ping yourself(not loopback).....here`s a good test.plug the
hub back
> in with everything live...5 `ll get ya 10 it works fine...(don`t
switch
> anything off..just plug the hub into the mains and then move the
network
> cables)....i recon it will work fine....
>
> there is really no technical (DONT SHOOT,list) answer for this..it`s
not a
> bug in the hub/ethernet protocol or anything ....it just happens...
> Windows crahses.....hubs don`t like changes (bieng switched on or
off)
>
> steve
>
> >From: "Paul Borghese"
> >Reply-To: "Paul Borghese"
> >To: [EMAIL PROTECTED]
> >Subject: Re: Problem with home network [7:6922]
> >Date: Mon, 4 Jun 2001 09:17:16 -0400
> >
> >Ok, I changed the HUP with a 10/100 MB switch. That fixed the
problem.
> >Why? I have no idea. It is quite puzzling how a hub would affect
the
> >connection one hop away.
> >
> >I am wondering if it is a combination of the hub/ethernet card/ and
> >software
> >problem (as described in another response). This started when I
upgraded
> >the kernel to the latest version.
> >
> >Anyway changing the hub fixed the problem. I just bugs the heck
out of me.
> >
> >Take care,
> >
> >Paul Borghese
> >
> >W. Alan Robertson wrote:
> > >
> > > Paul,
> > >
> > > If the ethernet driver was setting the card up for 100Mbps, and
> > > you
> > > were using a 10Mbps Hub, then you'd likely get no connectivity
> > > at all,
> > > rather than partial connectivity with a high percentage of
> > > packet
> > > loss.
> > >
> > > I'd be inclined to look into the duplex settings, as Daniel
> > > mentioned.
> > > A hub, even a so-called "dual-speed" hub, doesn't have the
> > > capability
> > > of providing for full duplex operation. When you cable the two
> > > machine together directly, they can communicate in full-duplex,
> > > which
> > > is most likely the reason the problem goes away when not using
> > > the
> > > hub. Manually configure both the Linux box, and the PC, for
> > > half-duplex operation, and your problem should go away.
> > >
> > > Alan
>
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