On Wed, 6 Jun 2001, Aviram Jenik wrote:
> I'm having a strange problem with my ADSL connection. I'm not sure the
> problem is Linux related (probably isn't), but hopefully the solution is
> Linux related :-)
>
> I recently replaced my home network's hub with a dual-speed switch (3Com's
> officeconnect) that supports both 10 and 100 connections.
> My home network has a mix of 10 and 100 NICs, where the Linux machine that
> serves as my ADSL gateway has a 10mb NIC, but 2 Windows machines on the
> network have 100mb NICs.
> Since the upgrade, those two machines suffer from strange problems while
> surfing the web and downloading e-mails, where the connection is sometimes
> terminated abruptly.
> My guess is that those machines are sending packets in 100mbps whereas the
> Linux machine uses a 10mbps card and loses packets, which results in a
> broken connection.
> Installing a 10mbps card on one of these stations solved the problem, but
> obviously that isn't the solution I'm looking for.
> Is there any way I can configure either the Linux gateway or the Windows
> machines to solve this problem (MTU settings perhaps?!).
Check for duplex settings mismatch. This is the most common problem we
had with 3Com switches (and switches in general). Although this usually
causes slow tranfer rates rather than broken connections. Do notice that
some NICs do not let you set the card's speed and duplex (SGI and some Sun
models). In this case disabling duplex auto negotiate and forcing full
duplex on the port is a sure way of causing duplex mismatch because these
NICs will fall back to half duplex.
Also, but this is extremely unlikely, you might have some compatibility
problems. I've seen a 3Com LS1100 which had similar problems with Accton
NICs of a very specific vintage (November '99 if I am recalling
correctly). Also, I have seen some problems with Kingston's hubs. Replace
the 100Mb cards with other brands (Intel EtherExpress is always a good
choise).
>
> TIA.
>
> - Aviram
>
>
>
>
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>
-- Yaron.
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