First, we need to disable interactive SSH sessions so regular users won’t be able to SSH into the bastion. Now let’s take a look at the bastion server configuration. With ~/.ssh/config updated as shown above, a user can simply type: $ ssh 10.5. To avoid using -J flag many times, you can configure your client to apply this flag automatically based on the destination host name or address, and you can use wildcards: Host 10.5.5.* Note that 10.5.5.10 is the remote host’s address on a local datacenter network (or a VPC), not the local network of the client. The bastion host is specified via -J flag and it is used to jump to another host (10.5.5.10). If your bastion host is accessible via then you can access other hosts behind it (on the same VPC/LAN) via -J command line flag, i.e. OpenSSH is usually preinstalled on most Linux and Mac computers. The configuration examples below make a couple of assumptions: We’ll start with OpenSSH as it’s the most common and it’s probably already installed on your Linux hosts. We’ll show how to set up an SSH bastion with two open-source projects: OpenSSH and Teleport. In fact, the best SSH bastion should allow SSH clients to do anything else, other than “jump” to their final destinations. When doing your infrastructure planning, it’s a good idea not to re-use the SSH bastion server for any other purpose. You have a process in place for applying software updates and security patches in a timely manner.SSH port is moved from #22 to something else.
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