Method, terminal and gateway for transmitting ipv6 packet in ipv4 network

A method for transmitting an IPv6 packet in an IPv4 network, comprising:

• receiving, by a first gateway, an IPv6 packet sent by an IPv6 terminal, wherein the IPv6 packet comprises a destination IPv6 address;
• and
• if the destination IPv6 address comprises an IPv4 address, encapsulating, by the first gateway, the IPv6 packet in an IPv4 packet of which a destination address is the IPv4 address, and sending the IPv4 packet to a second gateway, wherein the IPv4 address comprises one of an IPv4 address of the second gateway and an IPv4 address designated by the second gateway, the second gateway is one of a device connecting an IPv6 network to an IPv4 network and a device connecting a layer 2 network to an IPv4 network, and IPv6 addresses of all IPv6 terminals connected to the second gateway comprise the same IPv4 address.

A terminal having a processor, comprising:

• an obtaining module, configured to obtain, in the processor, an IPv6 address of the terminal, wherein the IPv6 address comprises one of an IPv4 address of a gateway and an IPv4 address designated by the gateway, the gateway is one of a device connecting an IPv6 network to an IPv4 network and a device connecting a layer 2 network to an IPv4 network, multiple IPv6 terminals are connected to the gateway, and IPv6 addresses of all the IPv6 terminals connected to the gateway comprise the same IPv4 address;
• and
• a sending module, configured to send, by the processor, an IPv6 packet to the gateway, wherein an IPv6 packet comprises the IPv6 address as a source address.

A gateway having a processor, comprising:

• a receiving module, configured to receive, in the processor, an IPv6 packet sent by an IPv6 terminal, wherein the IPv6 packet comprises a destination IPv6 address;
• and
• a first encapsulating module, configured to, if the destination IPv6 address comprises an IPv4 address, encapsulate the IPv6 packet in an IPv4 packet of which a destination address is the IPv4 address, and send the IPv4 packet to a second gateway, wherein the IPv4 address comprises one of an IPv4 address of the second gateway and an IPv4 address designated by the second gateway, the second gateway is one of a device connecting an IPv6 network to an IPv4 network and a device connecting a layer 2 network to an IPv4 network, and IPv6 addresses of all IPv6 terminals connected to the second gateway comprise the same IPv4 address.