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An engineer proposes a Pod CIDR that partially overlaps the Service CIDR to save address space. Why is this rejected?

  1. Overlapping ranges would make an address ambiguous between kinds
  2. The Service range must always be larger than the Pod range
  3. kube-proxy requires the two ranges to be adjacent
  4. CNI plugins cannot handle CIDRs shorter than /16
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Answer: A. Overlapping ranges would make an address ambiguous between kinds

Pod, Service and Node ranges must not overlap, because a single address could not otherwise be resolved to one kind of thing.

Source: Cluster Networking (Kubernetes) — Kubernetes IP address ranges

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