What does a NAT instance do?

You launch a NAT instance in a public subnet to enable instances in the private subnet to initiate outbound IPv4 traffic to the internet or other AWS services, but prevent the instances from receiving inbound traffic initiated on the internet. …

What is the difference between NAT gateways and NAT instances?

When a connection times out, a NAT gateway returns an RST packet to any resources behind the NAT gateway that attempt to continue the connection (it does not send a FIN packet). When a connection times out, a NAT instance sends a FIN packet to resources behind the NAT instance to close the connection.

What is the difference between bastion host and NAT instance?

So a bastion host allows inbound access to known IP addresses and authenticated users, a NAT instance allows instances within your VPC to go out to the internet.

Is NAT instance highly available?

NAT gateway is a AWS managed NAT service that provides better availability, higher bandwidth, and requires less administrative effort. A NAT gateway supports bursts of up to 10 Gbps of bandwidth. NAT gateway is associated with One Elastic IP address which cannot be disassociated after it’s creation.

Is NAT instance cheaper than NAT gateway?

And AWS will charge you for cross-AZ traffic within your VPC, so you’ll probably want one per availability zone. But if you’re pushing enough traffic, the cost of the NAT Instances will be less than the cost of a NAT Gateway.

What is AWS Elastic IP?

An Elastic IP address is a reserved public IP address that you can assign to any EC2 instance in a particular region, until you choose to release it. The Elastic IP address remains in place through events that normally cause the address to change, such as stopping or restarting the instance.

Why NAT gateway needs Elastic IP?

Simply stated, the EIP is required because that is the way the NAT Gateway feature was engineered.

Can you ssh into an EC2 instance in a private subnet?

You can SSH into EC2 instances in a private subnet using SSH agent forwarding. This method allows you to securely connect to Linux instances in private Amazon VPC subnets via a bastion host (aka jump host) that is located in a public subnet.