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NAT Gateway


NAT Gateway

Create a VPC with two subnets and allow public access to EC2 instances only on one subnet. Then enable the internet to EC2 instances in Private Subnet.



Requirement:

Create EC2 instance in private Subnet and provide Internet access using NAT Gateway.

Solution:

1.       Create One VPC with CIDR Range 10.0.0.0/16
2.       Create a private Subnet with CIDR Range 10.0.1.0/24
3.       Create a public Subnet with CIDR Range 10.0.2.0/24
4.       Create One Internet Gateway and assign to VPC.
5.       Create one custom Route table and associate Public Subnet.
a.       Create a global route (0.0.0.0/0) and target to IGW
6.       Associate private subnet to default Route table
7.       Launch one EC2 instance (VM1) in public Subnet with Public IP enabled.
8.       Launch another EC2 instance (VM2) in private Subnet with only Private IP.
9.       Navigate to VPC à Nat Gateways
10.   Click on Create NAT Gateway button
11.   In Subnet dropdown select Public Subnet
12.   Click on Create New IP button for allocating Elastic IP Allocation ID the click on Create a NAT Gateway button.
13.       Navigate to Route tables à Default Route table à Routes à Edit Routes
14.       Add Global routes (0.0.0.0/0) and select Nat Gateway from the Target drop-down and select the NAT Gateway ID then click on Save routes button.
15.       Login to VM1 instance with Public IP and SSH to VM2 using private IP and test the internet.
Note: You must copy the pem file used for VM2 instance and change the permission to 400

chmod 400 <pem file>
ssh -i <pem file> ec2-user@<private IP of EC2>

[ec2-user@ip-10-0-1-211 ~]$ ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=50 time=3.22 ms
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