Hosts or VM's not reaching or not being reachable to/from some IP's
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Hosts or VM's not reaching or not being reachable to/from some IP's

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Article ID: 407008

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Updated On:

Products

VMware vSphere ESXi

Issue/Introduction

  • ARP requests being sent to a vmkernel (vmk) or VM, but no ARP replies are received.
  • When main firewall fails over so that secondary firewall is active (with the same virtual IP as before), ESXi hosts are losing Management Network connectivity or not reachable from vCenter.
  • The ESXi host vmk is not getting the mac address for the gateway IP on their arp table (esxcli network ip neighbor list).
  • ARP requests are seen being sent upstream from host at the team uplink, the ARP reply is seen on different uplink.

Environment

VMware ESXi 7.x
VMware ESXi 8.x

Cause

A mismatch of load balancing method (Route Based on Originating Virtual Port) configured on the portgroup while the physical switch is configured with a portchannel (mode on).

Resolution

Set the impacted portgroup load balancing policy to Route Based on IP Hash or change to Inherit from vSwitch if the virtual switch load balancing is already set to Route Based on IP Hash.
Configure NIC Teaming, Failover, and Load Balancing on a vSphere Standard Switch or Standard Port Group

 

Additional Information

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