San Francisco, CA -- (SBWIRE) -- 07/14/2022 -- An external network such as the internet can be used with a bastion host so that authorized users can access a private network. The bastion host server is the only way for those internal resources to access the internet outside the firewall or in a DMZ. Taking this step minimizes the vulnerability and allows for more control over access.

To further understand bastion hosts, let's consider the case of a company's administrators requiring access to Linux machines connected within a subnet within its virtual private cloud. The administrator could gain access if they exposed a port to the public internet in each instance. This approach, however, would have serious security implications.

It has a unique IP address that can be accessed from the public internet and is located on its subnet. SSH connections to the bastion can only be made from a few IP addresses within the IT department. ACLs, allow lists, and other network-level controls can control access to the bastion's protected subnets.

Here are some tips for securing the Bastion hosts:

- Bastion hosts should be hardened.
- Controls should be tightened on the network.
- Secure SSH.

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