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Learning AWS - Second Edition by Amit Shah, Aurobindo Sarkar

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Bastion host

A bastion host is a secure host that accepts SSH connections only from trusted sources. A trusted source is the static IP address of your internet connection. This ensures that the access to your AWS resource is from a machine from within your network. A bastion is used to administer your AWS network and instances. All instances accept SSH connections only from the bastion security group.

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