I have both vCenter and ESXi hosts on latest versions. But since beginning one ping fails every now and then. Sometimes every couple of minutes more or less than other times. Each VM including vCenter, each host miss one ping at different times. I also observed some pattern of missing pings across different hosts one after the other host missing pings for example after 30 successful ping one of the hosts miss pings one after the other.
I have distributed switches and network setup across 3 hosts. However if I am not wrong I have seen pings missing even on single host right after it's installation so I mean without even distributed switches, kernels, nics etc... configured even and still missed ping issue was there.
Hosts are connected to mellanox ethernet L3 switch. And on this switch ports there are no errors reported. So It is unlikely it is mellanox switch issue. Each esxi host to mellanox connection port is a trunk port and VLANs are configured for each network such as VM network, Management network, vMotiion and vSAN networks.
There is no ping issue outside VMWare network so at this point I am thinking that there is some issue within the VMWare network. And since the issue shows up in each host, it doesn't look like it is hardware related or NIC related. May be some setting or something I would have no idea.
MTU = 1500 throughout, Flow Control is off on each switch port and on each windows VMs. Not sure about VMWare nodes. However even before when flow control was set to Global then also issue persisted so I doubt if issue is about flow control.
If you can resolve the issue quickly then let's connect.
Creating milestone is fine but will only release milestone if problem resolution confirmed through monitoring period.
You may have to do wireshark etc.., find out issue systematically and resolve it.
Let me know.
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