Abstract: A multicast processing method, apparatus and system. A Virtual eXtensible Local Area Network (VXLAN) tunnel end point (VTEP) receives configuration information sent by a management layer; and receives a multicast packet sent by a VM managed by the VTEP; when performing VXLAN encapsulation on the multicast packet after determining that the virtual machine (VM) matches the VM tenant identifier, the VTEP encapsulates a destination address of the multicast packet into the multicast address on a layer 3 network according to a mapping relationship between a VM multicast address and a multicast address on the layer 3 network, and encapsulates a VXLAN source address of the multicast packet into a layer 3 network multicast source address according to a mapping relationship between a VM multicast source address and a layer 3 network multicast source address; and sends an encapsulated multicast packet to the layer 3 network.

Abstract: A method, an apparatus, and a system for network address translation related to the field of communications technologies. A NAT control apparatus receives a network address migration message after a first data center migrates a NAT mapping entry corresponding to a migrated virtual machine VM to a second data center, verifies the network address migration message, and updates home information of the NAT mapping entry in a network address mapping table from the first data center to the second data center according to the network address migration message. In this way, NAT address resources in each data center can be properly planned, and a release attack problem caused by a fact that applying and using of a VM are not performed in a same data center can be solved.

Abstract: A multicast processing method, apparatus and system. A Virtual eXtensible Local Area Network (VXLAN) tunnel end point (VTEP) receives configuration information sent by a management layer; and receives a multicast packet sent by a VM managed by the VTEP; when performing VXLAN encapsulation on the multicast packet after determining that the virtual machine (VM) matches the VM tenant identifier, the VTEP encapsulates a destination address of the multicast packet into the multicast address on a layer 3 network according to a mapping relationship between a VM multicast address and a multicast address on the layer 3 network, and encapsulates a VXLAN source address of the multicast packet into a layer 3 network multicast source address according to a mapping relationship between a VM multicast source address and a layer 3 network multicast source address; and sends an encapsulated multicast packet to the layer 3 network.

Abstract: A method, an apparatus, and a system for network address translation related to the field of communications technologies. A NAT control apparatus receives a network address migration message after a first data center migrates a NAT mapping entry corresponding to a migrated virtual machine VM to a second data center, verifies the network address migration message, and updates home information of the NAT mapping entry in a network address mapping table from the first data center to the second data center according to the network address migration message. In this way, NAT address resources in each data center can be properly planned, and a release attack problem caused by a fact that applying and using of a VM are not performed in a same data center can be solved.