Unknown hardware
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can someone tell me what kind of error is that?
"kernel: arp: unknown hardware address format (0x4500)"
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Sounds like a nic with an invalid macadress to me or something like that.
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if this is it i dnt care ;)
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It could as well be some kind of weird attack where someone tries to fill up your switch with crap to do some manipulation or whatever (similiar to mac flooding: http://en.wikipedia.org/wiki/MAC_flooding ). It should not occur in a sane environment.