Network connection systems and methods and network access devices

1. A method for connecting a terminal device to a network through a network access device, the network access device including a processor and a connection configuration component, the method comprising:

receiving, by the processor, a connection request from the terminal device;

authenticating, by the processor, the terminal device based on the connection request;

obtaining, by the processor, a verified Internet protocol (IP) address from the connection configuration component; and

transmitting, by the processor, the verified IP address to the terminal device in a handshake protocol after the terminal device is authenticated, wherein the terminal device is configured to be connected to the network by using the verified IP address and the handshake protocol includes a four-way handshake, wherein the transmitting the verified IP address to the terminal device in the handshake protocol includes:

filling the verified IP address into an information element (IE) field of an extensible authentication protocol over local area network (EAPOL) message in the four-way handshake; and

transmitting the verified IP address to the terminal device through the EAPOL message.

2. The method of claim 1 , wherein the IP address is verified according to a verification approach, the verification approach including:

obtaining a candidate IP address from the connection configuration component;

verifying a validity of the candidate IP address by detecting a conflict regarding the candidate IP address in the network; and

in response to that the candidate IP address is valid, designating the candidate IP address as the verified IP address.

3. The method of claim 2 , further including:

in response to that the candidate IP address is invalid, obtaining a new IP address from the connection configuration component, and verifying a validity of the new IP address according to the verification approach.

4. The method of claim 1 , wherein authenticating the terminal device based on the connection request includes:

transmitting a challenge request to the terminal device;

receiving response information regarding the challenge request from the terminal device; and

authenticating the terminal device based on the response information.

5. The method of claim 1 , wherein the connection configuration component includes a dynamic host configuration protocol (DHCP) server.

6. A method for connecting a terminal device to a network through a network access device, the method comprising:

transmitting, by the terminal device, a connection request to the network access device;

receiving, by the terminal device, a challenge request for an authentication of the terminal device from the network access device;

transmitting, by the terminal device, response information regarding the challenge request to the network access device; and

receiving, by the terminal device, a verified Internet protocol (IP) address from the network access device in a handshake protocol after the terminal device is authenticated, wherein the terminal device is configured to be connected to the network via the verified IP address, the handshake protocol includes a four-way handshake, and the verified IP address is filled into an information element (IE) field of an extensible authentication protocol over local area network (EAPOL) message in the four-way handshake.

7. The method of claim 6 , wherein the verified IP address is valid in the network.

8. The method of claim 6 , wherein the connection configuration component includes a dynamic host configuration protocol (DHCP) server.

9. A network access device for connecting a terminal device to a network, the network access device including a processor and a connection configuration component, the processor being configured to perform operations comprising:

receiving a connection request from the terminal device;

authenticating the terminal device based on the connection request;

obtaining a verified Internet protocol (IP) address from the connection configuration component; and

transmitting the verified IP address to the terminal device in a handshake protocol after the terminal device is authenticated, wherein the terminal device is configured to be connected to the network by using the verified IP address and the handshake protocol includes a four-way handshake, wherein the transmitting the verified IP address to the terminal device in the handshake protocol includes:

filling the verified IP address into an information element (IE) field of an extensible authentication protocol over local area network (EAPOL) message in the four-way handshake; and

transmitting the verified IP address to the terminal device through the EAPOL message.

10. The network access device of claim 9 , wherein the IP address is verified according to a verification approach, the verification approach including:

obtaining a candidate IP address from the connection configuration component;

verifying a validity of the candidate IP address by detecting a conflict regarding the candidate IP address in the network; and

in response to that the candidate IP address is valid, designating the candidate IP address as the verified IP address.

11. The network access device of claim 9 , wherein authenticating the terminal device based on the connection request includes:

transmitting a challenge request to the terminal device;

receiving response information regarding the challenge request from the terminal device; and

authenticating the terminal device based on the response information.