Unknown hardware

[ginosteel]

can someone tell me what kind of error is that?

"kernel: arp: unknown hardware address format (0x4500)"

[hoba]

Sounds like a nic with an invalid macadress to me or something like that.

[ginosteel]

if this is it i dnt care  ;)

[sullrich]

@ginosteel:

if this is it i dnt care  ;)

I would absolutely care if this is a business's network.

[hoba]

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.