Re: Basic network setup problem

From: Fatted (obeseted_at_yahoo.com)
Date: 07/05/04 

Date: Mon, 05 Jul 2004 10:22:29 +0200

Allen Kistler wrote:
> Fatted wrote:
>
>> I've just done an install of Fedora2 on a machine which is connected
>> via a dumb hub to a windows box.
>>
>> Fedora box : 10.0.0.100 netmask 255.255.255.0
>> Windows box: 10.0.0.151 netmask 255.255.255.0
>>
>> However, I can't do a basic ping from one box to the other. I ran
>> ethereal on the Fedora box and did a ping to that box from the windows
>> box.
>> This shows up in ethereal as an ARP request
>> Who has 10.0.0.151? Tell 10.0.0.100
>>
>> Not being the brightest networking spark, this looks to me like the
>> ping from the windows box has gotten as far as the Fedora box, but the
>> Fedora box doesn't know where to send the reply back to?
>
>
> Actually the ping (which would be ICMP traffic) is never sent. The
> first thing the Fedora box has to do is determine the Windows' MAC
> address. That's what ARP does. Except the Windows box never answered.
> Cables could be bad; hub or NICs could be dead or misconfigured;
> routing could be screwed up; etc.

Or an idiot is in charge :( The Fedora box has 2 nics, and yes ladies
and gentlemen I plugged the wire into the wrong nic. What was throwing
me off (even more than my own cleverness) was that I could see the ARP
messages via Ethereal, but couldn't figure out why they weren't pinging.

However this does lead me to the question, how does the Fedora box know
that it needs to determine the windows MAC address (i.e. "the Who has
10.0.0.151? Tell 10.0.0.100" stuff) if the ICMP traffic wasn't arriving
correctly?

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