| 7.4 |  | VPN Enterprise Management |
| 7.4.3 |  | Supported tunneling technologies |

| The Router MC supports the following tunneling technologies:

- IPSec - IPSec is a framework of open standards that provides data confidentiality, data integrity, and data origin authentication between peers that are connected over unprotected networks, such as the Internet.
- IPSec with GRE - GRE is a tunneling protocol that can encapsulate a variety of protocol packet types inside IP tunnels. GRE accomplish this by creating a virtual point-to-point link to devices at remote points over an IP internetwork.
- IPSec with GRE over a Frame Relay network - This option provides all the advantages of using IPSec with GRE and the ability to create secure VPN tunnels over a Frame Relay network.

Figure illustrates a summary of the properties of IPSec versus IPSec with GRE.