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Well, there are encrypted CNIs like Weave. I've used Calico over ZeroTier to similar effect. The network is 'encrypted' and there isn't much effort required past initial configuration.

But that's not really the issue. You still have a big plaintext network with a bunch of random stuff talking, no mutual auth and no security controls other than segmentation. That's the tricky problem that mTLS and service meshes attempt to solve.

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First, I’ll respond this w.r.t. k8s CNI specifically: all inter-node traffic is encrypted, the only plaintext is localhost. If you’re worried about network snooping on localhost you’ve got bigger problems. As for security controls, that’s what Network Policies are for.

Outside of k8s (where one has greater control over how specifically e.g. Wireguard is deployed). Again, there is no plaintext outside of localhost. Wireguard is mutual auth, I’m not sure why you think it isn’t. Wireguard + firewall is security control since, well, you have mutual auth so rules can be applied per-client.

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