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feat: Support overlapping tenant IP address space across VPCs #2446

@benhuntley

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@benhuntley

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Low

Use case / problem

Cloud-parity expectation: customers — especially hybrid setups linking an on-prem DC to the AI factory over MPLS — want to bring their own IP space, which may overlap between tenants (e.g. two tenants both using 10.0.0.0/24). NICo's IPAM currently blocks overlapping IP within a site.

Raised by

Reliance (multi-tenant AI factory, hybrid/MPLS).

Current state / workaround

  • NICo enforces non-overlapping IP today (guards in VPC peering / allocation); noted as unlikely to be lifted soon.
  • Workaround: handle overlapping ranges outside NICo via NAT (firewall / edge / MPLS NAT).
  • Distinct from BYOIP: announcing your own (non-overlapping) prefix via host→DPU BGP is already supported (BGP-Peering page); this request is specifically about overlapping address space.
  • Technically, separate VRFs/L3 VNIs can carry overlapping prefixes as long as those VPCs never interconnect, but NICo currently guards against overlap.

Ask

Capture the request and, near-term, document the limitation + NAT workaround.

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