AWS NAT Gateway Basics
AWS NAT Gateway will be a service provided by AWS that will help you access the internet of the instance which is configured in the private subnet and also it will restrict the inbound traffic without proper routing.
- Outbound Internet Access: The instance which is present in the VPC of a private subnet can’t access the internet directly it will request the NAT Gateway then the NAT Gateway will route the traffic to the internet.
- Supported protocols: NAT Gateway will support the following protocols TCP, UDP, and ICMP.
- Improved Security: NAT Gateway will restrict access from the outbound direct to the private instance in the private subnet.
- Integrated with Route Table: You can integrate the NAT Gateway with the routing table which will allow the traffic to the private subnet. So the traffic which is coming from the outbound will directly comes to the NAT Gateway.
- Bandwidth: NAT Gateway will support the bandwidth of 5Gbps bandwidth and it can automatically scale to 100Gbps.
- Automated Failover: If the NAT Gateway in Availability Zone fails, it will route the traffic to another NAT Gateway that is available in another healthy NAT Gateway.
AWS NAT Gateway Use Cases
- Internet Access To Private Instance: The major use case of the NAT gateway is to provide outbound access to the internet from the private instance which is in the VPC of the Private subnet.
- Secured Connections: The software which is presented in the private subnets will require updates and sometimes it requires software patches For that you need to connect with external repositories depending u on the requirement then you need to have internet access the connects with the repositories will be secured with the NAT Gateway.
- Integration Is Simple: The SaaS(Software as a Service) is used so many companies and the application is going to reside on the public internet with the help of NAT Gateway communicating with this application is very easy.
- Hybrid Cloud Deployments: You can connect your on-premises servers to the cloud for data transfer with secured connections which is an outbound connection.
Amazon Web Services – Introduction to NAT GatewaysAWS NAT Gateway Use Cases
To access the Internet, one public IP address is needed, but we can use a private IP address in our private network. The idea of NAT is to allow multiple devices to access the Internet through a single public address. To achieve this, the translation of a private IP address to a public IP address is required. Network Address Translation (NAT) is a process in which one or more local IP address is translated into one or more Global IP address and vice versa in order to provide Internet access to the local hosts. Also, it does the translation of port numbers i.e. masks the port number of the host with another port number, in the packet that will be routed to the destination. It then makes the corresponding entries of IP address and port number in the NAT table. NAT generally operates on a router or firewall.
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