[Gllug] Strange network behaviour

[Alistair Mann]

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Thus spaketh Adrian McMenamin on Sunday 18 May 2003 7:01 pm:
> I have a 10/100 Mb switch and a 10 Mb hub. The 10 Mb hub is connected to
> the 100 Mb switch.
>
> Well, I have connected two other computers to the hub (a Power PC running
> Mac OS 9 and a nix box). They work fine, connecting to the internet via the
> gateway - which is connected to the switch.
>
> But when I attach my Thinkpad, also running Linux (RH 8) it cannot connect
> to or ping the gateway. But it can connect to and ping another box
> connected to the switch.
>
> All boxes are on the same network - 192.168.62.0/24.
>
> Even if I disconnect another box from the hub, my Thuinkpad still won't see
> the gateway.
>
> Any ideas?

So what you're saying is that the laptop, while connected to the switch, can 
see anything else connected to the switch; yet it cannot see anything on the 
slow speed hub, and I assume, cannot see anything else on the hub even when 
directly connected to it?

It sounds like your laptop is not autosensing the speed of the network 
traffic, confining itself to 100mb. What you could do is cold boot your 
thinkpad after connecting to the 10mb hub and see if you can then ping the 
MacOS box. If you can, this would be an autosense problem. (If your interface 
is hotswappable, such as a pcmcia card, you could remove it and return it 
rather than a cold reboot).

If you still can't ping -n then other machines, perhaps your machine is being 
forced to the speed. Are you insmoding the driver with something like 'insmod 
driver options=0x100'? Intel's NICs (and others) are forced to certain speeds 
this way. What does dmesg tell you about the interface speed? Is tulip_diag 
(or whatever's similar for your nic) able to tell you more, allow you to play 
with the settings?

I think the general point here is that you need to localise your problem much 
more than you've done so far!

Cheers,
- -- 
Alistair

Today is Pungenday, the 65th day of Discord in the YOLD 3169
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