I'm trying to map our network and I stumbled into this issue where I'm seeing three MAC address connected to a single port. I checked it and it's not connected to another switch. It's connected to a Host PC and from the looks of it it's running both LINUX and WINDOWS.
Here's the ouput of show mac add table on the 2960 switch:
dsw#show mac address-table | include Gi1/0/42
10 001f.290e.ea1f DYNAMIC Gi1/0/42
10 bed7.a3a5.aacc DYNAMIC Gi1/0/42
10 caee.5871.63cc DYNAMIC Gi1/0/42
I login to the host PC and run ipconfig all and it's showing me this mac add (I deleted other stuff):
Ethernet adapter Local Area Connection 2:
Connection-specific DNS Suffix . : caas.local
Description . . . . . . . . . . . : Realtek RTL8139C+ Fast Ethernet NIC #2
Physical Address. . . . . . . . . : 5A-63-09-BA-D2-B3
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Realtek RTL8139C+ Fast Ethernet NIC
Physical Address. . . . . . . . . : CA-EE-58-71-63-CC
As you can see I can see the two MAC add but I can't find the third one: bed7.a3a5.aacc.
Any ideas where it is coming from? I already cleared the table but it will still show up.
Thanks.
