OVM 3.2.x - Intermittent Connectivity issues for Virtual Machine Network with 10GbE Emulex NIC on HP Blade servers
Last updated on DECEMBER 13, 2017
Applies to:Oracle VM - Version 3.2.1 and later
Information in this document applies to any platform.
On HP ProLiant Blade Servers with 10GbE Emulex NIC, running Oracle VM 3.2.x, there is an intermittent problem observed where the Virtual Machines cannot ping the gateway IP, although they can consistently ping the IP set on the Dom0's tagged VLAN interface.
- The problem may not be seen at all the times and at some instances, the problem goes away once the VM is migrated to another Oracle VM Server.
- Reviewing the packet flows captured using tcpdump at different interfaces reveals :
- From inside the Guest VM that runs Linux OS, ARP requests goes out through the interface but there is no reply.
- The corresponding "VIF" interface at the Dom0 also shows the ARP requests and there is no corresponding reply.
- Over the associated physical interface at Dom0, tcpdump data shows ARP requests that were originated from the VM and the corresponding ARP replies are received from the Gateway IP.
- This means, the ARP replies are not getting through the bridge interface to the corresponding VIF.
- After a static ARP entry for the Gateway IP is created at the Guest OS, the Guest VM can ping the Gateway IP successfully.
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