KB 2885541 Packet sniffing tool does not sniff all network traffic through port mirroring on Windows 2012 Server VMs

A recent bug fix lead to a new hotfix KB2885541 for Windows Server 2012 (Windows Server 2012 Datacenter and Windows Server 2012 Standard)

 

It occurs when:

  • The VM is hosted on Server 2012
  • The VM is connected to a virtual switch which connects to a physical network.
  • 2 PCs connect to the physical network.
  • VMs and PCs are on same subnet.
  • You set Mirroring Mode to Destination under the Port Mirroring section of Advanced Features in the VM’s network settings.
  • The packet sniffing tool is run in the VM.
  • And ping PC B from PC A.

 

Download it here https://support.microsoft.com/kb/2885541

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