Servers Drop Off For A Split Second

[Fazza]

We have just started getting network/server issues where PINGs are coming back not responding for one ping and when connecting to the servers (both physical Hyper-V hosts and the VMs).

 

In the event viewer of the hyper-v hosts we get this:

 

MAC conflict: A port on the virtual switch has the same MAC as one of the underlying team members on Team Nic Microsoft Network Adapter Multiplexor Driver

 

Anybody had this before? If so, help!

 

[andydis]

Do you have any nics bonded on the HOST?

Do you have any nics bonded on the VM's?

[Fazza]

There is a NIC on the server that has 4 network ports in it that were teamed up to give the server 4Gbps throughput when we orginally set the servers up a few years ago. All the VMs have a single NIC in them.

[andydis]

ok so you have 4 nics All teamed?

open hyper v manager and virtual switch manager >

how many virtual swicthes do you have?

list the external network adaptors they are connected too

let us know if the tick box "allow management operating system to share this network adaptor" is ticked?

[Fazza]

ok so you have 4 nics All teamed?

 

Yes

 

open hyper v manager and virtual switch manager > how many virtual swicthes do you have?

 

3 virtual switches (Private, Internal Network Switch only and the External one which is the one we use for all the VMs)

 

 

list the external network adaptors they are connected to

 

The External Network Virtual Switch is connected to the TEAM of 4 NICs - there are no other options in the drop down menu

 

let us know if the tick box "allow management operating system to share this network adaptor" is ticked?

 

As you'll see from the screenshot linked above, this option is ticked.

[Blue_Cookeh]

Can you run this in Powershell on the Hyper-V host and paste the output?

 

get-netadapter | sort macaddress

[Fazza]

Name                      InterfaceDescription                    ifIndex Status       MacAddress             LinkSpeed
----                      --------------------                    ------- ------       ----------             ---------
vEthernet (Internal Ne... Hyper-V Virtual Ethernet Adapter #3          17 Up           00-15-5D-0F-1D-20        10 Gbps
Ethernet 4                Intel(R) 82576 Gigabit Dual Port N...#4      15 Up           00-25-90-10-C5-EE         1 Gbps
TMS NIC TEAM              Microsoft Network Adapter Multiplexo...      24 Up           00-25-90-10-C5-EE         4 Gbps
vEthernet (Microsoft N... Hyper-V Virtual Ethernet Adapter #2          25 Up           00-25-90-10-C5-EE        10 Gbps
Ethernet 7                Intel(R) 82576 Gigabit Dual Port N...#3      14 Up           00-25-90-10-C5-EF         1 Gbps
Ethernet 6                Intel(R) 82576 Gigabit Dual Port Net...       4 Up           00-25-90-10-C5-F0         1 Gbps
Ethernet 8                Intel(R) 82576 Gigabit Dual Port N...#2       6 Up           00-25-90-10-C5-F1         1 Gbps

[Fazza]

I noticed that the Integration Services needed updating so I did that last night on all the VMs and rebooted them at silly o'clock in the morning so not to affect anybody and I've been pinging two VMs and the Hyper-V Host since I got in at 8am this morning and nothing has not responded yet so either it's fixed or it just hasnt gone wrong yet!!!