
AWS suggests the implementation of Remote Desktop Protocol (RDP) and Secure Shell Protocol (SSH) to eliminate the use of storing private keys on the bastion host. Make sure that the inbound and outbound traffic is restricted at the protocol level and tight security is maintained. Now, deploy the AWS bastion host to every Availability Zone you are going to use.

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Add SSH-agent forwarding or Remote Desktop Gateway for Linux and Windows Connectivity.Change the instances and ensure the inbound SSH can be accessed only by the Bastion Host’s IP address. Specify security groups and select a source.

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Also, if any hacker founds out the auth bypass or remote code execution for OpenSSH, he will get extremely lucky in no time. Also, if you have to run a large user base, then you might require more bastion hosts. These servers may add more load to your administrator with continuous running, monitoring, and patching. There are several benefits of running bastion hosts, but there are disadvantages too. The role of the bastion host is to provide users with private network access from an outside network, like the Internet, and minimize the chances of threat penetrations into the walls of a private network. Bastion Host is one of them that helps create SSH connections without an external IP address.

There are various methods to connect with virtual private cloud (VPC) with or without an external IP address. Once the connectivity is established, the server allows users to access these instances in private subnets via SSH or RDP. To state it the other way, a Bastion host acts like a bridge that stands between the users and private network to tighten access to your resources, instances, gateways, etc. The server will conduct regular audits and act as a guard to protect your vital data from threats. As per his article, he stated bastion hosts are crucial for network security. Ranum, a cybersecurity researcher, highlighted the concept of bastion host in 1990. Every individual or organization demands a source where they can share their data more securely.

A bastion host or jump box is a server exposed on a public network whose purpose is to withstand malicious attacks or threats.
