Find answers, ask questions, and connect with our
community around the world.

Home Forums AWS AWS Certified Advanced Networking – Specialty VPC with private addressing – additional CIDR block Reply To: VPC with private addressing – additional CIDR block

  • Carlo-TutorialsDojo

    Member
    January 6, 2021 at 10:11 am

    Hello Rafa,

    Thanks for posting your question.

    Since your primary CIDR block resides within the 10.0.0.0/16 IPv4 range, you can’t add CIDR blocks from other RFC 1918* ranges (172.16.0.0/12 and 192.168.0.0/16). However, you are permitted to add any publicly routable IPv4 CIDR block (non-RFC 1918), hence the answer:

    • 34.17.0.0/16
    • 100.77.0.0/16

    You can refer to this table from AWS documentation for more information.

    I hope this helps and let us know if you have any other clarifications.

    Regards,

    Carlo