Removing an IPv4 CIDR Block or IPv6 Prefix from a VCN

You can remove an IPv4 CIDR block or IPv6 prefix from a Virtual Cloud Network (VCN), with some restrictions.

  • You can't remove an IPv4 CIDR block if an IP address in that range is in use.
  • While the VCN is being updated, you can't create or update the VCN's subnets, VLANs, local peering gateways (LPGs), or route tables.
  • After you assign an IPv6 prefix to a VCN, the VCN must always have at least one IPv6 prefix assigned to it. Additionally, a VCN must have at least one CIDR block assigned to it.

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