-- FengpingHu - 13 Aug 2021
By default calico sets ipipMode to "always", but this is not the recommended setting. We also noticed sometimes pod can't be reached when it's routed through the tun interface. Disable overlay network would give the highest performance and simplest network -- ref
Here's how this is done -- Be aware that switching encapsulation modes can cause disruption to in-progress connections. Plan accordingly.