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NAT

  • Network Address Translation

NAT Instances​

  • Allows EC2 instances in private subnet to connect to the internet.
  • Must be launched in public subnet.
  • Must disable Source / Destination check.
  • Must have Elastic IP attached.
  • Route tables must be configured.

NAT Gateway​

  • AWS managed NAT.
  • Create in a specific AZ and uses Elastic IP.
  • Can only based used by EC2 instances from another subnet.
  • Requires Internet Gateway.
  • No security groups to manage.