| 摘要 |
An Internet Protocol Security (IPsec) protected Generic Routing Encapsulation (GRE) tunnel is established between the Access Service Network (ASN) and Connectivity Service Network (CSN) of a Simple IP network. A GRE layer is inserted between the user plane and the IP transport plane, and a GRE key is used to differentiate each user session. The IPsec protected GRE tunnel may be used to provide full Dynamic Host Configuration Protocol (DHCP) configuration support. It may also used to provide broadcast/multicast support, as well as non-IP traffic support. The GRE key may consist of a first half key and a second half key; the first half key may be allocated by a first node, and the second half key may be allocated by a second node. |
