Method for implementing gre tunnel, access point and gateway

Abstract

A method for implementing a GRE tunnel, an access point (AP), and a gateway (GW). The method includes: the AP receives a first packet, where the first packet carries an address of the GW; configures a GRE tunnel to the GW, where a source destination of the GRE tunnel is an address of the AP, and a destination address of the GRE tunnel is the address of the GW; the AP receives a second packet sent by user equipment; performs GRE tunnel encapsulation for the second packet to form a third packet; and the AP sends the third packet to the GW by using the GRE tunnel, where the third packet carries the address of the AP. The embodiments of the present application enable efficient establishment of the GRE tunnel between the AP and the GW if there are a large quantity of APs.

What is claimed is: 
     
         1 . A method for implementing a generic routing encapsulation (GRE) tunnel by an access point (AP), comprising:
 receiving a Control And Provisioning of Wireless Access Points (CAPWAP) packet sent by an access controller (AC), wherein the CAPWAP packet carries an address of a gateway (GW);   configuring a GRE tunnel from the AP to the GW, wherein a source address of the GRE tunnel is an address of the AP, and a destination address of the GRE tunnel is the address of the GW;   receiving a packet sent by a user equipment;   performing GRE tunnel encapsulation for the packet sent by the user equipment to form a encapsulated packet; and   sending the encapsulated packet to the GW by using the GRE tunnel.   
     
     
         2 . The method according to  claim 1 , wherein the CAPWAP packet comprises a GW address configuration attribute, and the GW address configuration attribute comprises a type field, and an attribute value field, wherein a value of the type field is used to identify the attribute field as the GW address configuration attribute, and a value of the attribute value field is the address of the GW 
     
     
         3 . An access point (AP), comprising:
 a processor; and   a non-transitory computer readable medium which contains computer-executable instructions that, when executed by the processor, causes the AP to perform the steps of:   receiving a Control And Provisioning of Wireless Access Points (CAPWAP) packet sent by an access controller (AC) that carries an address of a gateway (GW);   configuring a GRE tunnel from the AP to the GW, wherein a source address of the GRE tunnel is an address of the AP, and a destination address of the GRE tunnel is the address of the GW;   receiving a packet sent by a user equipment;   performing GRE tunnel encapsulation for the packet sent by the user equipment to form a encapsulated packet; and   sending the encapsulated packet to the GW by using the GRE tunnel.   
     
     
         4 . The access point according to  claim 3 , wherein the CAPWAP packet comprises a GW address configuration attribute, and the GW address configuration attribute comprises a type field, and an attribute value field, wherein a value of the type field is used to identify the attribute field as the GW address configuration attribute, and a value of the attribute value field is the address of the GW. 
     
     
         5 . A non-transitory computer readable medium which contains computer-executable instructions, wherein the computer-executable instructions, when executed by a processor, enables an access point (AP) to perform operations comprising:
 receiving a Control And Provisioning of Wireless Access Points (CAPWAP) packet sent by an access controller (AC) that carries an address of a gateway (GW);   configuring a GRE tunnel from the AP to the GW, wherein a source address of the GRE tunnel is an address of the AP, and a destination address of the GRE tunnel is the address of the GW;   receiving a packet sent by user equipment;   performing GRE tunnel encapsulation for the packet sent by the user equipment to form a encapsulated packet; and   sending the encapsulated packet to the GW by using the GRE tunnel.   
     
     
         6 . The non-transitory computer readable medium according to  claim 5 , wherein the CAPWAP packet comprises a GW address configuration attribute, and the GW address configuration attribute comprises a type field, and an attribute value field, wherein a value of the type field is used to identify the attribute field as the GW address configuration attribute, and a value of the attribute value field is the address of the GW.