Encrypting traffic with IPsec protected GRE tunnel
Let's take a look at some options available to us when securing traffic that is transmitted over the Internet. For the sake of a scenario to work with lets consider that site A is an existing site with a 3rd party network we must integrate with, and site B is a newly commissioned site that now needs to receive traffic. The deployment initially consists of two Cisco ASA 5505X's, each with a connection to a public Internet connection. A VPN is configured between these two devices to allow secure transmission of traffic from the third party network over the Internet to the storage server. Worth mentioning is the basic configuration of a Cisco ASA. Out of the box it will require configuration for an 'Inside' and 'Outside' interface, as well as SSH for remote management: ## Cisco ASA interface configuration: interface GigabitEthernet1/1 nameif outside security-level 0 ip address ( publicIP ) 255.255.255.252 interface GigabitEthernet1/3 nameif...