The tale of a single MAC
rsm at fast-serv.com
Sun Jan 2 08:53:40 CST 2011
---------- Original Message -----------
From: Graham Wooden <graham at g-rock.net>
> Hi there,
> I encountered an interesting issue today and I found it so bizarre
> so I thought I would share it.
> I brought online a spare server to help offload some of the recent
> VMs that I have been deploying. Around the same time this new
> machine (we¹ll call it Server-B) came online, another machine which
> has been online for about a year now stopped responding to our
> monitoring (and we¹ll name this Server-A). I logged into the switch
> and saw that the machine that stopped responding was in the same
> VLAN as this newly deployed, and then quickly noticed that Server-
> A¹s MAC address was now on Server-B¹s switch port. ³What the ...²
> was my initial response.
Fresh OS install from scratch or did you load an image from an existing server?
What make/model of on-board NICs?
More information about the NANOG