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NACLs.md

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Network Access Control Lists (NACLs)

  • Return to table of contents

  • Useful Links:

  • Notes:

    • Processing starts in order from the lowest number to the higher.
      • ie, 100 before 110
    • Once a rule matches, it applies the rule and stops.

  • Exam Tips:

    • Subnets can only be associated with one NACL.
    • Stateless.
    • Exam gotcha, troubleshoot connectivity between EC2 instances in the same subnet, a NACL does not restrict this.
    • Traffic within a subnet, EC2 instance to EC2 instance, would not be affected.
      • It only affects traffic that crosses a subnet boundary.
    • Default for custom NACLs is deny everything.