Tuesday, May 10, 2011

VMs unable to ping the host (ESXi/ESX 4.1) after upgrading from 4.0 U1

Background: The upgrade of the esxi 4.ou1 to esxi 4.1 has been made on 2 hosts of the cluster and after that some VMs in the host esxi 4.1 cannot ping the host and some VMs in the same host can ping the host but otherwise every other network communication between VMs to VMs and hosts to hosts is proper.
What worked : Remove the nics from the VM in the VM settings and add them back after a reboot.
What did not work: updating the proper ip information in /etc/hosts and /etc/sysconfig/network
restarting the management agents.