Re: 96% packet loss on my network
Heikki Vatiainen wrote:
>
> Paul Nathan Puri wrote:
> > I just set up my network (laptop to desktop). I'm running linux on
> > both.
> >
> > I pinged my desktop and it seems there is 96% packet loss there. Why
> > would this be?
> >
> > On both machines there is a fast ethernet NIC, and I have a fast
> > ethernet 3Com hub.
> >
> > When I telnet my desktop from my laptop, a prompt comes up, but very
> > slowly. It won't let me type in my login, and then it times out.
>
> Is your hub one of those listed at
OK, I'm pinging now.
Yes, it is on of these 3Com hubs.
The Port status section of the leds remains light on the 100
section for both cards.
The Network Utilization section of the hub leds consistently
blinks, on the 1% led of the 100 section; after every 13th
blink, both the 100 and the 10 blink together.
Does this tell you anything?
Thanks. Hows the weather in Finland? In Sacramento,
California it wet and cloudy. C-ya.
> http://www.3com.com/products/dsheets/400317a.html and do you
> have access to it so you can check the port LEDs? Since the
> cards work at least a little, they are probably running
> correctly at 100Mbs. However, if your hub is autosensing 10/100
> Mbits it might have problems doing the speed conversion if one
> of your cards is in 10Mbits and the other is 100Mbits mode. I'm
> only guessing here since I have no experience about how well
> hubs do the speed conversion.
>
> One thing I know that has caused problems is NIC having different
> view on duplexness than the hub or switch. If the NIC runs in
> full-duplex mode and the hub is only half-duplex, the hub may
> partition (shut down) the port. The reason for this is the NIC
> causing too many collisions if it does not listen the receive
> pair before it starts to transmit. The port LEDs on the hub
> should indicate if the port has been partitioned, so you might
> want to check the hub before and after the connection dies.
>
> > Any help in this matter would be greatly appreciated.
>
> I hope this helps
>
> // Heikki
> --
> Heikki Vatiainen * hessu@cs.tut.fi
> Tampere University of Technology * Tampere, Finland
>
> --
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NatePuri
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McGeorge School of Law
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