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Are you using AWS as your cloud provider? Have you heard of bastion hosts but aren’t quite sure what they are or how useful they can be? Allow us to shed some light on this topic!

What is a Bastion Host?

A bastion host is a special-purpose computer on a network specifically designed and configured to withstand attacks. It is typically deployed on a separate subnet within an AWS Virtual Private Cloud (VPC) and is used to secure access to other instances within the same VPC.

The key benefit of using a bastion host is that it provides a single point of entry to your VPC from outside the network. This makes it easier to monitor and control access to your instances, as you can configure your security groups to only allow traffic from the bastion host while blocking all other inbound traffic to your VPC.

Difference between Bastion Host and NAT Instance

If you’re familiar with AWS, you may have also heard of NAT instances. While NAT instances and bastion hosts share some similarities, they serve very different purposes.

NAT instances are used to allow instances on a private subnet to access the Internet while still keeping the instances secure from inbound traffic. Bastion hosts, on the other hand, are used to secure access to instances within the same VPC.

Why use a Bastion Host?

Now that you know what a bastion host is and the difference between a bastion host and a NAT instance, let’s explore why using a bastion host can be so useful.

Tips for using a Bastion Host:

• Use a bastion host to secure access to other instances within the same VPC.
• Configure your security groups to only allow traffic from the bastion host while blocking all other inbound traffic to your VPC.
• Make sure to harden your bastion host by applying security best practices such as keeping the software up-to-date, configuring multi-factor authentication, and restricting administrative access.

Ideas for using a Bastion Host:

• Use a bastion host to provide secure access to your database instances within the same VPC.
• Use a bastion host to provide secure access to your application instances within the same VPC.
• Use a bastion host to provide secure access to your management console within the same VPC.

How to set up a Bastion Host:

1. Create a new VPC within the AWS Management Console.
2. Create a new subnet within the VPC and designate it as your bastion host subnet. This subnet should contain only the bastion host instance.
3. Create one or more additional subnets within the VPC for your other instances.
4. Launch a new EC2 instance in the bastion host subnet and configure the necessary security groups and IAM roles.
5. Connect to the bastion host instance using SSH or RDP and then use this connection to access your other instances within the same VPC.

By now, you should have a better understanding of what a bastion host is and how useful it can be in securing access to your instances within an AWS VPC. Whether you decide to use a bastion host or not, always remember to follow best practices and keep your instances secure.

If you’re not sure where to start or would like professional guidance, reach out to the team at AWS for help. They offer a range of support options to help you get started and ensure your cloud infrastructure is secure and performing optimally.

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