Address-transparent device and method

• US 7,787,477 B2
• Filed: 07/11/2005
• Issued: 08/31/2010
• Est. Priority Date: 07/11/2005
• Status: Active Grant

• Current Assignee: MKS Instruments Incorporated
• Original Assignee: MKS Instruments Incorporated
• Inventors: Makhota, Maxym, Sifnatsch, Guenter, Richter, Matthew
• Primary Examiner(s): Phunkulh; Bob A
• Application Number:
  US11/178,626
• Publication Number:
  US 20070008972A1
• Time in Patent Office: 1,877 Days
• Field of Search: None
• US Class Current: 370/401
• CPC Class Codes: H04L 45/00 Routing or path finding of packets in data switching networks routing or path finding in wireless networks H04W40/00
• CPC Class Codes: H04L 61/103 across network layers, e.g. resolution of network layer into physical layer addresses or address resolution protocol [ARP]
• CPC Class Codes: H04L 61/2503 Translation of Internet protocol [IP] addresses
• CPC Class Codes: H04L 67/12 specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks

Abstract

An address-transparent device is disclosed that couples two networks in a semiconductor fab and communicates packets between a host on a first network and a tool on a second network. Optionally, the address-transparent device intercepts packets for local use by a data consumer that resides within or outside of the address-transparent device. The address-transparent device can intercept all or a portion of data streams. As another option, the address-transparent device reroutes packet to another destination by changing the header of the received packet.

Claims

1. A method for operating an address-transparent device coupled between a first network interface and a second network interface, comprising:

listening and receiving a packet by an address-transparent device, the packet having a first header and being addressed to a device distinct from the address-transparent device; and

the address-transparent device reading the first header of the packet and selecting an appropriate handling of the packet from actions including,

forwarding the packet as addressed,

locally utilizing the packet as an instruction to the address-transparent device without forwarding it,

checking if the address-transparent device is in a sniffer mode, wherein the address-transparent device makes a copy of the packet for local use if the address-transparent device is in the sniffer mode, and

changing the destination address of the packet and forwarding it to the changed destination address.

2. The method of claim 1, wherein the first header comprises a first destination MAC address and a first source MAC address.

3. The method of claim 1, wherein the first header comprises a first destination MAC address, a first source MAC address, a first destination IP address, a first source IP address, a first destination port, and a first source port.

4. The method of claim 1, wherein the intercepting step comprises intercepting the packet for local use by a data consumer to provided added services.

5. The method of claim 4, further comprising sending the intercepted packet to a data processor, the data processor providing additional functionalities for processing the data in the intercepted packet.

6. The method of claim 5, wherein the data processor adds at least one function to a host coupled to the first network interface.

7. The method of claim 5, wherein the data processor adds at least one function to a tool coupled to the second network interface.

8. The method of claim 1, wherein the rerouting step comprises rerouting the packet having a second header including a second destination MAC address, a second source MAC address, a second destination IP address, a second source IP address, a second destination port, and a second source port.

9. The method of claim 1, further including the address-transparent device determining whether the packet is sent from a data communication reply to an intercepted packet.

10. The method of claim 1, further including the address-transparent device determining whether the packet is sent from a data communication reply to a rerouted packet.

11. The method of claim 1, prior to the checking step, further comprising detecting for the presence of a broadcast storm.

12. The method of claim 11, prior to the receiving step, further comprising configuring the address-transparent device coupled to a host through the first network interface and a tool through the second network interface.

13. A method for operating an address-transparent device, comprising:

placing an address-transparent device having first and second interfaces in a physical network circuit;

in the address-transparent device, listening on the first interface for packets in a first address space;

processing the first address space packet by forwarding at least some broadcast packet via the second interface; and

based on destination of the first address packet, selecting an appropriate handling of the packet from actions including,

forwarding the packet as addressed,

if the address-transparent device is in a sniffer mode, making a copy of the packet for local use and locally utilizing the packet as an instruction to the address-transparent device, and

changing the destination address of the packet and forwarding it to the changed destination address.

14. The method of claim 13, further comprising listening on second interface for packets in the first address space.

15. The method of claim 14, further comprising listening on the second interface for packets in the second address space.

16. The method of claim 15, further comprising physically connecting the physical network circuit across the first and second interfaces without processing through the address-transparent device operating in a failsafe mode.

17. An address-transparent device, comprising:

a first port having no IP address;

a second port;

a filter coupled between the first and second ports, adapted to receive at least one packet, the filter analyzing the packet and selecting an appropriate handling of the packet from actions including,

forwarding the packet as addressed,

locally utilizing the packet as an instruction to the address-transparent device without forwarding it, and

changing the destination address of the packet and forwarding it to the changed destination address; and

a failsafe switch coupled between the first and second ports, in parallel with the filter, wherein the first and second ports are directly coupled by the failsafe switch to bypass the address-transparent device when the address-transparent device fails to function properly.

18. The device of claim 17, wherein the second port in the address-transparent device has no IP address.

19. The device of claim 17, wherein the second port in the address-transparent device has a predefined IP address.

20. The system of claim 17, wherein a first network coupled to one of the ports comprises a tool network.

21. The system of claim 20, wherein a second network coupled to another of the ports comprises a fab network.

22. The system of claim 20, wherein the second network interface comprises a private network interface.

23. The system of claim 17, wherein the address-transparent device, the host and the tool operate in a semiconductor fab environment.