Data packet forwarding

A data packet forwarding method, to be implemented by a Virtual Extensible Local Area Network Tunnel End Point (VTEP) device, comprising:

• when the data packet is received through a private network port, matching the data packet to a flow table according to a first target Internet Protocol (IP) address of the data packet;
• transmitting a flow table request to the Software Defined Network (SDN) controller when the data packet is not matched with the flow table;
• receiving the flow table from the SDN controller;
• when the flow table comprises a Network Address Translation (NAT) process instruction for the first source IP address, performing a NAT processing for the first source IP address of the data packet to obtain a public network address corresponding to the first source IP address, performing Virtual Extensible Local Area Network (VXLAN) encapsulation for the data packet according to the public network address corresponding to the first source IP address and encapsulation information in the flow table, wherein the a second source IP address of the encapsulated data packet is the public network address corresponding to the first source IP address, a second target IP address of the encapsulated data packet is the public network address corresponding to the first target IP address of the data packet in the flow table;
• forwarding the encapsulated data packet through an output port in the flow table.

A data packet forwarding apparatus, to be implemented by a Software Defined Network (SDN) controller, comprising:

• an obtaining module, to obtain and store a Network Address Translation (NAT) mapping relationship between a private network address and a public network of a host computer in each SDN;
• a receiving module, to receive a flow table request for a data packet from a Virtual Extensible Local Area Network Tunnel End Point (VTEP) device;
• a processing module, to search for a NAT mapping relationship corresponding to a target Internet Protocol (IP) address of the data packet when the receiving module receives the flow table and it is determined that the data packet is forwarded across SDNs;
• generate a flow table used for forwarding the data packet according to the NAT mapping relationship corresponding to the target IP address searched out and network topology information, wherein the flow table comprises a NAT processing instruction for a source IP address and encapsulation information, and a target IP address in the encapsulation information is a public network address in the NAT mapping relationship searched out;
• a transmitting module, to transmit the flow table generated by the processing module to the VTEP device.

A data packet forwarding apparatus, to be implemented by a Virtual Extensible Local Area Network Tunnel End Point (VTEP) device, comprising:

• a receiving module, to receive a data packet, receive a flow table;
• a processing module, to when the receiving module receives the data packet through a private network port, match the data packet to a flow table according to a first target Internet Protocol (IP) address of the data packet;
• when the receiving module receives the flow table from the Software Defined Network (SDN) controller, when the flow table comprises a Network Address Translation (NAT) process instruction for the first source IP address, perform a NAT processing for the first source IP address of the data packet to obtain a public network address corresponding to the first source IP address, perform Virtual Extensible Local Area Network (VXLAN) encapsulation for the data packet according to the public network address corresponding to the first source IP address and encapsulation information in the flow table, wherein the a second source IP address of the encapsulated data packet is the public network address corresponding to the first source IP address, a second target IP address of the encapsulated data packet is the public network address corresponding to the first target IP address of the data packet in the flow table;
• a transmitting module, to transmit a flow table request to the SDN controller when the data packet is not matched with the flow table, forward the encapsulated data packet through an output port in the flow table.