[K12OSN] sudden apearance of X errors - solved

Julius Szelagiewicz julius at turtle.com
Wed May 11 01:49:29 UTC 2011

Les, excellent suggestion. The problem is that the duplicated server
address is the hardest to detect. The tools opn HP switches are not
adequate. What helped most was interviewing all the people who could have
had even remotest possibility to mess with networked equipement. In other
words, network engineering married to social engerineering. Having a
runner that everybody likes helped a lot.

> On 5/10/2011 4:22 PM, Julius Szelagiewicz wrote:
>> Barry,
>> 	server 64 bit Centos 5.6, Ltsp 32 bit 4.x.
>> Turns out I was chasing my own tail. The problem turned out to be
>> hardware
>> related, more specifically, network related. A well meaning soul laid
>> his
>> hands on the key to the attendance hand scanner and to make sure it
>> works
>> perfectly well changed the address on it to be the same as the eth0
>> address on the server. People won't tell me who it was.
>> 	I went about finding the solution by first admitting it is not a
>> software problem and then disconnecting switches from the stack. Once I
>> got it down to a particular switch I disconnected all the ports and
>> reconnected them one by one. Culprit was found, but not immediately.
>> What
>> a pain.
> I was going to suggest watching the network activity with wireshark but
> I'm not sure you would have seen packets from the rouge device - the
> switch probably would have diverted the ones that should have been
> coming to you.
> --
>    Les Mikesell
>     lesmikesell at gmail.com
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