Question

Two business units in your company each run production workloads in separate VPCs within the same Google Cloud organization. Leadership now requires the VPCs to communicate over private IPs using VPC Network Peering. During planning, your network engineer discovers that both VPCs use the same subnet range, 10.10.0.0/16, in the us-central1 region. What must you do to enable the peering connection?

Accepted Answer

Re-IP one of the VPCs so that no subnet CIDR ranges overlap between the two VPCs before creating the peering.

Answer

Establish the VPC peering anyway and add custom static routes to disambiguate the overlapping ranges between the two VPCs.

Answer

Enable transitive peering through a shared hub VPC that performs NAT translation for the overlapping ranges.

Answer

Configure Cloud NAT in both VPCs to mask the overlapping internal ranges so peering can proceed.