Method and apparatus for virtualizing a locally initiated outbound connection from a connection manager

• US 6,445,704 B1
• Filed: 06/30/1998
• Issued: 09/03/2002
• Est. Priority Date: 05/02/1997
• Status: Expired due to Term

• Current Assignee: Cisco Systems, Inc., Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Kersey, Edward C., Howes, Richard A.
• Primary Examiner(s): Nguyen, Chau
• Assistant Examiner(s): HYUN, SOON D
• Application Number:
  US09/107,238
• Time in Patent Office: 1,526 Days
• Field of Search: 370/389, 370/392, 370/393, 370/397, 370/399, 370/401, 370/409, 370/464, 370/465, 370/471, 370/475, 370/400, 709/203, 709/217, 709/218, 709/219
• US Class Current: 370/392
• CPC Class Codes: H01R 2201/04 for network, e.g. LAN connectors
• CPC Class Codes: H01R 31/005 Intermediate parts for distributing signals
• CPC Class Codes: H04B 1/74 for increasing reliability, e.g. using redundant or spare channels or apparatus replacing by standby devices for amplifiers H03F1/52, H03F1/542
• CPC Class Codes: H04L 2101/663 Transport layer addresses, e.g. aspects of transmission control protocol [TCP] or user datagram protocol [UDP] ports
• CPC Class Codes: H04L 41/00 Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
• CPC Class Codes: H04L 61/00 Network arrangements, protocols or services for addressing or naming
• CPC Class Codes: H04L 61/2517 using port numbers
• CPC Class Codes: H04L 61/35 involving non-standard use of addresses for implementing network functionalities, e.g. coding subscription information within the address or functional addressing, i.e. assigning an address to a function
• CPC Class Codes: H04L 67/1001 for accessing one among a plurality of replicated servers
• CPC Class Codes: H04L 67/1008 based on parameters of servers, e.g. available memory or workload monitoring of computer activity G06F11/30
• CPC Class Codes: H04L 67/1023 based on a hash applied to IP addresses or costs
• CPC Class Codes: H04L 67/1029 using data related to the state of servers by a load balancer
• CPC Class Codes: H04L 67/1031 Controlling of the operation of servers by a load balancer, e.g. adding or removing servers that serve requests
• CPC Class Codes: H04L 67/1034 Reaction to server failures by a load balancer
• CPC Class Codes: H04L 69/40 for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection management of faults, events, alarms or notifications in data switching networks H04L41/06

Abstract

A system and method are disclosed for virtualizing locally initiated outbound connections from a physical machine used to implement a virtual machine. The method includes providing a virtual machine object having a virtual IP address that corresponds to the virtual machine. Inbound connections directed to the virtual machine are handled by the physical machine having a physical machine IP address. A static physical machine object is also provided. The static physical machine object contains the virtual IP address and the physical machine IP address. When a SYN packet is intercepted for an outbound connection having a SYN packet source IP address that corresponds to the physical machine IP address and a packet destination address that corresponds to a foreign IP address, it is determined whether the packet source IP address matches the physical machine IP address. If the packet source IP address matches the physical machine IP address, then a connection object is created for handling outbound connections from the physical machine IP address. A counter in a physical machine object is incremented when the connection object is created so that the locally generated connection may be considered for the purpose of load balancing new remotely generated connections.

Claims

1. A method of virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine comprising:

providing a virtual machine object having a virtual IP address that corresponds to the virtual machine wherein inbound connections directed to the virtual machine are handled by the physical machine having a physical machine IP address;

providing a static physical machine object wherein the static physical machine object contains the virtual IP address and the physical machine IP address;

intercepting a SYN packet for an outbound connection having a SYN packet source IP address that corresponds to the physical machine IP address and a packet destination address that corresponds to a foreign IP address;

determining that the packet source IP address matches the physical machine IP address; and

creating a connection object for handling outbound connections from the physical machine IP address.

2. A method of virtualizing a locally initiated outbound connection from a physical machine as recited in claim 1 wherein the connection object includes the virtual IP address and the physical IP address.

3. A method of virtualizing a locally initiated outbound connection from a physical machine as recited in claim 2 wherein the connection object includes a virtual port number and a physical port number.

4. A method of virtualizing a locally initiated outbound connection from a physical machine as recited in claim 2 further including intercepting a data packet having a data packet source IP address that matches the physical IP address and translating the data packet source IP address to the virtual IP address.

5. A method of virtualizing a locally initiated outbound connection from a physical machine as recited in claim 1 wherein the static physical machine object contains a pointer to a physical machine object.

6. A method of virtualizing a locally initiated outbound connection from a physical machine as recited in claim 5 wherein providing a static physical machine object further includes specifying a physical machine port and searching among a plurality of physical machine objects for a matching physical machine object that matches the physical machine IP address and the physical machine port.

7. A method of virtualizing a locally initiated outbound connection from a physical machine as recited in claim 6 further including storing a pointer to the matching physical machine object in the static physical machine object.

8. A method of virtualizing a locally initiated outbound connection from a physical machine as recited in claim 7 wherein the pointer to the matching physical machine object is used to increment a connection counter in the physical machine object when the connection object is created.

9. A method of virtualizing a locally initiated outbound connection from a physical machine as recited in claim 8 wherein the connection counter also counts inbound connections made to the physical machine.

10. A method of virtualizing a locally initiated outbound connection from a physical machine as recited in claim 6 wherein the matching physical machine object is used to load balance inbound connections from a foreign IP address.

11. A method of virtualizing a locally initiated outbound connection from a physical machine as recited in claim 5 wherein the physical machine object includes a counter that keeps track of the number of connections made to the physical machine object.

12. A method of virtualizing a locally initiated outbound connection from a physical machine as recited in claim 11 wherein the number of connections made to the physical machine object include inbound connections to the virtual machine handled by the physical machine.

13. A method of virtualizing a locally initiated outbound connection from a physical machine as recited in claim 12 further including incrementing the counter when the connection object for handling outbound connections from the physical machine IP address is created.

14. A method of virtualizing a locally initiated outbound connection from a physical machine as recited in claim 1 wherein the outbound connection from the physical machine is counted along with inbound connections made to the physical machine for the purpose of load balancing new incoming connections.

15. A connection manager for distributing remotely initiated connections to a virtual machine using a physical machine and virtualizing locally initiated connections from the physical machine comprising:

a virtual machine object having a virtual IP address that corresponds to the virtual machine wherein inbound connections directed to the virtual machine are handled by the physical machine having a physical machine IP address;

a static physical machine object wherein the static physical machine object contains the virtual IP address and the physical machine IP address;

a packet interceptor that is operative to intercept a SYN packet for an outbound connection having a SYN packet source IP address that corresponds to the physical machine IP address and a packet destination address that corresponds to a foreign IP address; and

a connection object that includes the virtual IP address and the physical IP address that is used to handle outbound connections from the physical machine IP address.

16. A connection manager for distributing remotely initiated connections to a virtual machine using a physical machine and virtualizing locally initiated connections from the physical machine as recited in claim 15 further including a physical machine object and wherein the static physical machine object contains a pointer to a physical machine object.

17. A connection manager for distributing remotely initiated connections to a virtual machine using a physical machine and virtualizing locally initiated connections from the physical machine as recited in claim 16 wherein the pointer to the physical machine object is used to increment a connection counter in the physical machine object when the connection object is created.

18. A computer program product for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine, the computer program product being embodied in a computer readable medium and comprising computer instructions for:

providing a virtual machine object having a virtual IP address that corresponds to the virtual machine wherein inbound connections directed to the virtual machine are handled by the physical machine having a physical machine IP address;

providing a static physical machine object wherein the static physical machine object contains the virtual IP address and the physical machine IP address;

intercepting a SYN packet for an outbound connection having a SYN packet source IP address that corresponds to the physical machine IP address and a packet destination address that corresponds to a foreign IP address;

determining that the packet source IP address matches the physical machine IP address; and

creating a connection object for handling outbound connections from the physical machine IP address.

19. A computer program product for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 18 wherein the connection object includes the virtual IP address and the physical IP address.

20. A computer program product for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 19 wherein the connection object includes a virtual port number and a physical port number.

21. A computer program product for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 19, further comprising computer instructions for intercepting a data packet having a data packet source IP address that matches the physical IP address and translating the data packet source IP address to the virtual IP address.

22. A computer program product for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 18 wherein the static physical machine object contains a pointer to a physical machine object.

23. A computer program product for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 22 wherein providing a static physical machine object further includes specifying a physical machine port and searching among a plurality of physical machine objects for a matching physical machine object that matches the physical machine IP address and the physical machine port.

24. A computer program product for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 23, further comprising computer instructions for storing a pointer to the matching physical machine object in the static physical machine object.

25. A computer program product for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 24 wherein the pointer to the matching physical machine object is used to increment a connection counter in the physical machine object when the connection object is created.

26. A computer program product for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 25 wherein the connection counter also counts inbound connections made to the physical machine.

27. A computer program product for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 23 wherein the matching physical machine object is used to load balance inbound connections from a foreign IP address.

28. A computer program product for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 22 wherein the physical machine object includes a counter that keeps track of the number of connections made to the physical machine object.

29. A computer program product for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 28 wherein the number of connections made to the physical machine object include inbound connections to the virtual machine handled by the physical machine.

30. A computer program product for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 29 further comprising computer instructions for incrementing the counter when the connection object for handling outbound connections from the physical machine IP address is created.

31. A computer program product for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 18 wherein the outbound connection from the physical machine is counted along with inbound connections made to the physical machine for the purpose of load balancing new incoming connections.

32. A system for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine, comprising:

a processor; and

computer memory accessible by the processor and configured to store computer code executable by the processor, the computer code comprising computer instructions for;

providing a virtual machine object having a virtual IP address that corresponds to the virtual machine wherein inbound connections directed to the virtual machine are handled by the physical machine having a physical machine IP address;

providing a static physical machine object wherein the static physical machine object contains the virtual IP address and the physical machine IP address;

intercepting a SYN packet for an outbound connection having a SYN packet source IP address that corresponds to the physical machine IP address and a packet destination address that corresponds to a foreign IP address;

determining that the packet source IP address matches the physical machine IP address; and

creating a connection object for handling outbound connections from the physical machine IP address.

33. A system for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 32 wherein the connection object includes the virtual IP address and the physical IP address.

34. A system for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 33 wherein the connection object includes a virtual port number and a physical port number.

35. A system for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 33, wherein the computer code further comprises computer instructions for intercepting a data packet having a data packet source IP address that matches the physical IP address and translating the data packet source IP address to the virtual IP address.

36. A system for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 32 wherein the static physical machine object contains a pointer to a physical machine object.

37. A system for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 36 wherein providing a static physical machine object further includes specifying a physical machine port and searching among a plurality of physical machine objects for a matching physical machine object that matches the physical machine IP address and the physical machine port.

38. A system for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 37, wherein the computer code further comprises computer instructions for storing a pointer to the matching physical machine object in the static physical machine object.

39. A system for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 38 wherein the pointer to the matching physical machine object is used to increment a connection counter in the physical machine object when the connection object is created.

40. A system for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 39 wherein the connection counter also counts inbound connections made to the physical machine.

41. A system for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 37 wherein the matching physical machine object is used to load balance inbound connections from a foreign IP address.

42. A system for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 36 wherein the physical machine object includes a counter that keeps track of the number of connections made to the physical machine object.

43. A system for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 42 wherein the number of connections made to the physical machine object include inbound connections to the virtual machine handled by the physical machine.

44. A system for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 43 wherein the computer code further comprises computer instructions for incrementing the counter when the connection object for handling outbound connections from the physical machine IP address is created.

45. A system for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine as recited in claim 32 wherein the outbound connection from the physical machine is counted along with inbound connections made to the physical machine for the purpose of load balancing new incoming connections.

46. A system for virtualizing a locally initiated outbound connection from a physical machine used to implement a virtual machine, comprising:

means for providing a virtual machine object having a virtual IP address that corresponds to the virtual machine wherein inbound connections directed to the virtual machine are handled by the physical machine having a physical machine IP address;

means for providing a static physical machine object wherein the static physical machine object contains the virtual IP address and the physical machine IP address;

means for intercepting a SYN packet for an outbound connection having a SYN packet source IP address that corresponds to the physical machine IP address and a packet destination address that corresponds to a foreign IP address;

means for determining that the packet source IP address matches the physical machine IP address; and

means for creating a connection object for handling outbound connections from the physical machine IP address.