Systems and methods for maintaining transparent end to end cache redirection

• US 9,237,208 B2
• Filed: 05/23/2014
• Issued: 01/12/2016
• Est. Priority Date: 12/23/2009
• Status: Active Grant

• Current Assignee: Citrix Systems, Inc. (Cloud Software Group)
• Original Assignee: Citrix Systems, Inc. (Cloud Software Group)
• Inventors: Annamalaisami, Saravanakumar, Shetty, Anil, Suganthi, Josephine, Choudhary, Akshat
• Primary Examiner(s): SHAW, PELING ANDREW
• Application Number:
  US14/286,296
• Publication Number:
  US 20140258390A1
• Time in Patent Office: 599 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G06Q 10/10 Office automation; Time management
• CPC Class Codes: H04L 61/5007 Internet protocol [IP] addresses
• CPC Class Codes: H04L 67/01 Protocols
• CPC Class Codes: H04L 67/563 Data redirection of data network streams
• CPC Class Codes: H04L 67/568 Storing data temporarily at an intermediate stage, e.g. caching
• CPC Class Codes: H04L 69/16 Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
• CPC Class Codes: H04L 69/324 in the data link layer [OSI layer 2], e.g. HDLC

Abstract

The present disclosure presents systems and methods for maintaining original source and destination IP addresses of a request while performing intermediary cache redirection. An intermediary receives a request from a client destined to a server identifying a client IP address as a source IP address and a server IP address as a destination IP address. The intermediary transmits the request to a cache server, the request maintaining original IP addresses and identifying a MAC address of the cache server as the destination MAC address. The intermediary receives the request from the cache server responsive to a cache miss, the received request maintaining the original source and destination IP addresses. The intermediary identifying that the third request is coming from the cache server via one or more data link layer properties of the third transport layer connection. The intermediary transmits to the server the request identifying the client IP address as the source IP address and the server IP address as the destination IP address.

Claims

1. A method comprising:

(a) receiving, by a device intermediary to a plurality of clients and one or more servers, a request from a client to access a server, wherein a source internet protocol (IP) address of the request comprises a client IP address, a source port of the request comprises a client port and a destination IP address of the request comprises a server IP address;

(b) transmitting, by the device, the request to a cache server, the source port of the request modified to comprise a first port of the device while the request is maintained to have the client IP address as the source IP address and the server IP address as the destination IP address;

(c) receiving, by the device from the cache server responsive to a cache miss, a returned request having the client internet protocol (IP) address as the source IP address, a port of the cache server as a source port of the returned request and the server IP address as the destination IP address of the returned request;

(d) identifying, by the device, from one or more network layer properties of the returned request that the returned request is a cache miss to the request of the client; and

(e) transmitting, by the device, the request of the client to the server, the request modified to identify a second port of the device as the source port of the request while maintaining the server IP address as the destination IP address and the client IP address as the source IP address.

2. The method of claim 1, wherein (b) further comprises modifying, by the device, the request to comprise a virtual local area network (VLAN) of the cache server as a destination VLAN.

3. The method of claim 1, wherein (b) further comprises modifying, by the device, the request to comprise a media access control (MAC) address of the cache server as the destination MAC address and a MAC address of the device as a source MAC address.

4. The method of claim 1, wherein (b) further comprises determining, by the device, that content requested by the request may be cached on the cache server.

5. The method of claim 1, wherein (c) further comprises receiving, by the device, the returned request comprising a media access control (MAC) address of the cache server as the source MAC address and a MAC address of the device as a destination MAC address.

6. The method of claim 5, wherein (d) further comprises identifying, by the device, that the returned request is from the cache server based on identifying the MAC address of the cache server in the returned request.

7. The method of claim 1, wherein (c) further comprises receiving, by the device, the returned request comprising a virtual local area network (VLAN) address of the cache server as a source VLAN address.

8. The method of claim 7, wherein (d) further comprises identifying, by the device, that the returned request is from the cache server based on identifying the VLAN address of the cache server in the returned request.

9. The method of claim 1, wherein (d) further comprises identifying, by the device, that the returned request is from the cache server based on identifying the port of the cache server in the returned request.

10. The method of claim 1, wherein (d) further comprise identifying, by the device, one or more network layer properties comprising a data link layer property of the request.

11. A system comprising:

a device intermediary a plurality of clients and one or more servers the configured to receive a request from a client to access a server, wherein a source internet protocol (IP) address of the request comprises a client IP address, a source port of the request comprises a client port and a destination IP address of the request comprises a server IP address;

wherein a cache redirector of the device is configured to transmit the request to a cache server, the source port of the request modified to comprise a first port of the device while the request is maintained to have the client IP address as the source IP address and the server IP address as the destination IP address;

wherein the cache redirector is configured to receive from the cache server responsive to a cache miss, a returned request having the client internet protocol (IP) address as the source IP address, a port of the cache server as a source port of the returned request and the server IP address as the destination IP address of the returned request; and

wherein the device is configured to identify from one or more network layer properties of the returned request that the returned request is a cache miss to the request of the client and transmit the request of the client to the server, the request modified to identify a second port of the device as the source port of the request while maintaining the server IP address as the destination IP address and the client IP address as the source IP address.

12. The system of claim 11, wherein the cache redirector is further configured to modify the request to comprise a virtual local area network (VLAN) of the cache server as a destination VLAN.

13. The system of claim 11, wherein the cache redirector is further configured to modify the request to comprise a media access control (MAC) address of the cache server as the destination MAC address and a MAC address of the device as a source MAC address.

14. The system of claim 11, wherein the device is further configured to determine that content requested by the request may be cached on the cache server.

15. The system of claim 11, wherein the cache redirector is further configured to receive the returned request comprising a media access control (MAC) address of the cache server as the source MAC address and a MAC address of the device as a destination MAC address.

16. The system of claim 11, wherein the device is further configured to identify that the returned request is from the cache server based on identifying the MAC address of the cache server in the returned request.

17. The system of claim 11, wherein the cache redirector is further configured to receive the returned request comprising a virtual local area network (VLAN) address of the cache server as a source VLAN address.

18. The system of claim 17, wherein the device is further configured to identify that the returned request is from the cache server based on identifying the VLAN address of the cache server in the returned request.

19. The system of claim 11, wherein the device is further configured to identify that the returned request is from the cache server based on identifying the port of the cache server in the returned request.

20. The system of claim 11, wherein the device is further configured to identify one or more network layer properties comprising a data link layer property of the request.