Hello guys,

need your help here...

Environment is MS 2019 Datacenter. All VMs are on azure including the network configuration. 

I have 2 node cluster with Node A and Node B. Each of the 2 nodes has 2 Network Interfaces. One is for the Production (LAN) network and one is for the cluster communication (HeartBeat) network. 

Production network is: 192.168.0.0/24

Node A have IP: 192.168.0.7

Node B have IP: 192.168.0.8

HB network is: 192.168.1.0/24

Node A: 192.168.1.100

Node B: 192.168.1.101

The problem is when node A hold the roles and resources (for example: File role) you can ping the file role and cluster virtual name IPs without problem. But there is no ping from the passive node to File Server role or cluster name IPs. "Destination host unreachable". If I do a failover to node B then, you can't ping cluster name or role from node A. Ping to the cluster virtual name or any of the roles is possible only from the active node. It's not working from the passive node or different server in the same production subnet 192.168.0.0/24

Failover is working. DNS successfully resolve the names when I ping the cluster role and cluster name. 

I search and found that the issue maybe is related to MAC Address Changes for Virtual Server During a Failover with Clustering.

But I don't know how to enable this gratuitous ARP requests on Azure network? Do you have any idea how to achieve this? 

I would like to share also: arp -a

Node A:

Interface: 169.254.2.241 --- 0x3
  Internet Address      Physical Address      Type
  169.254.255.255       ff-ff-ff-ff-ff-ff     static
  224.0.0.22            01-00-5e-00-00-16     static
  224.0.0.251           01-00-5e-00-00-fb     static
  224.0.0.252           01-00-5e-00-00-fc     static

Interface: 192.168.1.100 --- 0x4
  Internet Address      Physical Address      Type
  192.168.1.101         12-34-56-78-9a-bc     dynamic
  192.168.1.255         ff-ff-ff-ff-ff-ff     static
  224.0.0.22            01-00-5e-00-00-16     static
  224.0.0.251           01-00-5e-00-00-fb     static
  224.0.0.252           01-00-5e-00-00-fc     static
  255.255.255.255       ff-ff-ff-ff-ff-ff     static

Interface: 192.168.0.7 --- 0x5
  Internet Address      Physical Address      Type
  192.168.0.1           12-34-56-78-9a-bc     dynamic
  192.168.0.4           12-34-56-78-9a-bc     dynamic
  192.168.0.5           12-34-56-78-9a-bc     dynamic
  192.168.0.6           12-34-56-78-9a-bc     dynamic
  192.168.0.8           12-34-56-78-9a-bc     dynamic
  192.168.0.255         ff-ff-ff-ff-ff-ff     static
  224.0.0.22            01-00-5e-00-00-16     static
  224.0.0.251           01-00-5e-00-00-fb     static
  224.0.0.252           01-00-5e-00-00-fc     static
  255.255.255.255       ff-ff-ff-ff-ff-ff     static

Node B 

Interface: 192.168.0.8 --- 0x4
  Internet Address      Physical Address      Type
  192.168.0.1           12-34-56-78-9a-bc     dynamic
  192.168.0.4           12-34-56-78-9a-bc     dynamic
  192.168.0.5           12-34-56-78-9a-bc     dynamic
  192.168.0.6           12-34-56-78-9a-bc     dynamic
  192.168.0.7           12-34-56-78-9a-bc     dynamic
  192.168.0.255         ff-ff-ff-ff-ff-ff     static
  224.0.0.22            01-00-5e-00-00-16     static
  224.0.0.251           01-00-5e-00-00-fb     static
  224.0.0.252           01-00-5e-00-00-fc     static
  255.255.255.255       ff-ff-ff-ff-ff-ff     static

Interface: 169.254.1.63 --- 0x5
  Internet Address      Physical Address      Type
  169.254.255.255       ff-ff-ff-ff-ff-ff     static
  224.0.0.22            01-00-5e-00-00-16     static
  224.0.0.251           01-00-5e-00-00-fb     static
  224.0.0.252           01-00-5e-00-00-fc     static

Interface: 192.168.1.101 --- 0x6
  Internet Address      Physical Address      Type
  192.168.1.100         12-34-56-78-9a-bc     dynamic
  192.168.1.255         ff-ff-ff-ff-ff-ff     static
  224.0.0.22            01-00-5e-00-00-16     static
  224.0.0.251           01-00-5e-00-00-fb     static
  224.0.0.252           01-00-5e-00-00-fc     static
  255.255.255.255       ff-ff-ff-ff-ff-ff     static

I see that all network interfaces use the same and one MAC address? Is this the root cause of the issue? 

Thank you.