DYNAMIC HOST CONFIGURATION PROTOCOL RELEASE ON BEHALF OF A USER

• US 20160080318A1
• Filed: 09/11/2014
• Published: 03/17/2016
• Est. Priority Date: 09/11/2014
• Status: Active Grant

• Current Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Original Assignee: Aruba Networks Incorporated (Hewlett-Packard Enterprise Company)
• Inventors: Dwivedi, Abhishek, Sood, Aman
• Granted Patent: US 9,756,148 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 12/4641 Virtual LANs, VLANs, e.g. virtual private networks [VPN] LAN interconnection over a bridge based backbone H04L12/462; encapsulation techniques H04L12/4633; routing of packets H04L45/00; packet switches H04L49/00; virtual private networks for security H04L63/0272
• CPC Class Codes: H04L 61/255 Maintenance or indexing of mapping tables
• CPC Class Codes: H04L 61/5014 using dynamic host configuration protocol [DHCP] or bootstrap protocol [BOOTP]
• CPC Class Codes: H04L 61/5053 Lease time; Renewal aspects
• CPC Class Codes: H04L 67/01 Protocols

Abstract

The present disclosure discloses a method and a network device for performing DHCP release on behalf of a user in dynamic network environments. Specifically, a network device determines that a client device is no longer using a first Internet Protocol (IP) address assigned to the client device. In response to the determining that the client device is no longer using the first IP address, the network device then generates a Dynamic Host Configuration Protocol (DHCP) release message on behalf of the client device for removing the assignment of the first IP address to the client device. Moreover, the network device transmits the DHCP release message to a DHCP server.

Claims

1. A non-transitory computer readable medium comprising instructions which, when executed by one or more hardware processors, causes performance of operation comprising:

determining that a client device is no longer using a first Internet Protocol (IP) address assigned to the client device;

responsive to the determining that the client device is no longer using the first IP address, generating a Dynamic Host Configuration Protocol (DHCP) release message on behalf of the client device for removing the assignment of the first IP address to the client device; and

transmitting the DHCP release message to a DHCP server.

2. The medium of claim 1, wherein determining that the client device is no longer using the first IP address comprises determining that the client device has switched from a first Virtual Local Area Network (VLAN) corresponding to the first IP address to a second VLAN that is different than the first VLAN.

3. The medium of claim 1, wherein determining that the client device is no longer using the first IP address is performed by a switch.

4. The medium of claim 1, wherein determining that the client device is no longer using the first IP address is performed by a controller.

5. The medium of claim 1, wherein determining that the client device is no longer using the first IP address comprises determining that a second IP address, different than the first IP address, has been assigned to the client device.

6. The medium of claim 1, wherein determining that the client device is no longer using the first IP address is performed by snooping packets transmitted by the client device and determining that the client device is using a second IP address different than the first IP address.

7. The medium of claim 1, wherein determining that the client device is no longer using the first IP address comprises determining that a DHCP release message, corresponding to a first VLAN, that is transmitted by the client device while the client device is on a second VLAN different than the first VLAN.

8. The medium of claim 1, wherein determining that the client device is no longer using the first IP address is performed a particular access point with which the client device was associated while using the first IP address.

9. The medium of claim 1, wherein the DHCP release message identifies a MAC address of the client device and the first IP address.

10. The medium of claim 1, wherein the DHCP release message, generated on behalf of the client device, identifies the client device as a source of the DHCP release message.

11. A system comprising:

at least one network device comprising a hardware device;

the system performing operations comprising;

determining that a client device is no longer using a first Internet Protocol (IP) address assigned to the client device;

responsive to the determining that the client device is no longer using the first Internet Protocol (IP) address, generating a DHCP release message on behalf of the client device for removing the assignment of the first IP address to the client device;

transmitting the DHCP release message to a DHCP server.

12. The system of claim 11, wherein determining that the client device is no longer using the first IP address comprises determining that the client device has switched from a first VLAN corresponding to the first IP address to a second VLAN that is different than the first VLAN.

13. The system of claim 11, wherein determining that the client device is no longer using the first IP address is performed by a switch.

14. The system of claim 11, wherein determining that the client device is no longer using the first IP address is performed by a controller.

15. The system of claim 11, wherein determining that the client device is no longer using the first IP address comprises determining that a second IP address, different than the first IP address, has been assigned to the client device.

16. The system of claim 11, wherein determining that the client device is no longer using the first IP address is performed by snooping packets transmitted by the client device and determining that the client device is using a second IP address different than the first IP address.

17. The system of claim 11, wherein determining that the client device is no longer using the first IP address comprises determining that a DHCP release message, corresponding to a first VLAN, that is transmitted by the client device while the client device is on a second VLAN different than the first VLAN.

18. The system of claim 11, wherein determining that the client device is no longer using the first IP address is performed a particular access point with which the client device was associated while using the first IP address.

19. The system of claim 11, wherein the DHCP release message identifies a MAC address of the client device and the first IP address.

20. The system of claim 11, wherein the DHCP release message, generated on behalf of the client device, identifies the client device as a source of the DHCP release message.