ESX host allows 200 ICMP requests in one second in maximum, ICMP requests exceeding this limitation will be discarded by the destination ESX host. The current Ping test in vSAN Health Check is easy to hit this limitation because Health Service on ESX host sends ICMP request to all its peers in bundle. This is a known issue affecting vSAN 6.6 and 6.6.1. Currently there is no resolution.
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Christopher Sibug