Weird network problem solved.

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Hi everyone,

Finally we solved our network problem. Those of you suggesting a physical 
problem were right. But I still don't understand what was happening exactly, 
so maybe here's some guru who can explain it. Don't hesitate to give a 
complex answer, I had three years of physics at the university...

So here's (once again) a description of our setup:

   proxy  (IP: 192.168.0.1)
     |
     |  (Cable A)
     |
   ramboy (IP: 192.168.0.2)
     |
     |  (Cable B)
     |
    dave  (IP: 192.168.0.4)
     |
     |  (Cable C)
     |
    hal   (IP: 192.168.0.3)

We use a 10mbit/s ThinEthernet bus. The problem was that no direct 
communication between dave and hal was possible, although both could 
communicate to ramboy and proxy or the Internet via proxy.
Using KSnuffle we found out that no packets from hal were visible to dave and 
vice versa.
After having a look at the cables we discovered that cable A (!!!) was a 
RG-62 while cable B & C were RG-58. Swapping cables A and C moved the problem 
to proxy/ramboy. After replacing cable A everything was fine.

I'm just curious what was happening there, so can anyone explain why a cable 
at the other end of the network corrupts the communication between dave and 
hal without affecting anything else?

Bye,
	Benjamin & Katrin Niemann
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