Dell PowerEdge M805 Fabric OS Administrator’s Guide - Page 206

7 Management interface security Gateway-to-Gateway Tunnel In this scenario, neither endpoint of the IP connection implements IPsec, but the network nodes between them protect traffic for part of the way. Protection is transparent to the endpoints, and depends on ordinary routing to send packets through the tunnel endpoints for processing. Each endpoint would announce the set of addresses behind it, and packets would be sent in tunnel mode where the inner IP header would contain the IP addresses of the actual endpoints. FIGURE 18 Gateway tunnel configuration Endpoint-to-Gateway Tunnel In this scenario, a protected endpoint (typically a portable computer) connects back to its corporate network through an IPsec-protected tunnel. It might use this tunnel only to access information on the corporate network, or it might tunnel all of its traffic back through the corporate network in order to take advantage of protection provided by a corporate firewall against Internet-based attacks. In either case, the protected endpoint will want an IP address associated with the security gateway so that packets returned to it will go to the security gateway and be tunneled back. FIGURE 19 Endpoint to gateway tunnel configuration RoadWarrior configuration In endpoint-to-endpoint security, packets are encrypted and decrypted by the host which produces or consumes the traffic. In the gateway-to-gateway example, a router on the network encrypts and decrypts the packets on behalf of the hosts on a protected network. A combination of the two is referred to as a RoadWarrior configuration where a host on the internet requires access to a network through a security gateway that is protecting the network. IPsec protocols IPsec uses two different protocols, Authentication Header (AH) and Encapsulating Security Payload (ESP), to ensure the authentication, integrity and confidentiality of the communication. 166 Fabric OS Administrator's Guide 53-1001763-02