US20100183019A1 - Method and apparatus for distributing data packets to multiple network addresses - Google Patents
Method and apparatus for distributing data packets to multiple network addresses Download PDFInfo
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- US20100183019A1 US20100183019A1 US12/726,832 US72683210A US2010183019A1 US 20100183019 A1 US20100183019 A1 US 20100183019A1 US 72683210 A US72683210 A US 72683210A US 2010183019 A1 US2010183019 A1 US 2010183019A1
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- data packet
- network
- network processing
- processing units
- distributing unit
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/25—Mapping addresses of the same type
- H04L61/2503—Translation of Internet protocol [IP] addresses
- H04L61/2521—Translation architectures other than single NAT servers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/25—Mapping addresses of the same type
- H04L61/2503—Translation of Internet protocol [IP] addresses
- H04L61/2514—Translation of Internet protocol [IP] addresses between local and global IP addresses
Definitions
- the invention relates to network, and in particular, to a network device for distributing data packets to multiple network addresses.
- NAT is a process for translation of IP address. It enables a local-area network (LAN) to use a first set of network addresses for internal traffic and a second set of network addresses for external traffic.
- a network device that is capable of performing NAT operations is located preferably where a LAN meets a wide area network (WAN).
- WAN wide area network
- the most commonly used network address is based on the Internet Protocol, the IP address.
- the first set of IP addresses for internal traffic can be reused in many different LANs and are not unique.
- the second set of IP addresses for external traffic are unique and can not be reused by other networks.
- Each of the first set of IP addresses is assigned to a host in the LAN.
- a first host in a LAN intends to communicate with a second host on the Internet, it first transmits packets to a network device that is capable of performing NAT operations.
- the source address is one of the first set of addresses that is assigned to the host and cannot be used outside the LAN. Therefore, in order to transmit the data packet to its destination address, the network device replaces the source address with an address from the second set of addresses which can be used for external communication.
- the operation of replacing the source address of the packet with an address from the second set of addresses is part of the NAT process. After the NAT, the resulting source address of the packet can be uniquely used for external traffic, such as Internet communication.
- the present invention provides a network device that employs multiple NAT operations to transmit data packets to various network processing units. Since the NAT is a standard function of many network devices, the present invention is capable of transferring data packets to various network processing units according to system requirement without extra CPU or software operation. Consequently, system complexity and the cost can be reduced.
- a network device including a plurality of network addresses for indicating locations of a plurality of network processing units, and further including a data packet distributing unit for transferring a data packet to the network processing units in sequence by replacing a destination address of the data packet with the network addresses.
- the data packet distributing unit performs the actions of determining whether the data packet has been transferred to each of the network processing units, transferring the data packet to a network processing unit after replacing the destination address of the data packet with a corresponding network address if the data packet has not been transferred to the network processing unit, and outputting the data packet if the data packet has been transferred to each of the processing units.
- a network system including a plurality of network processing units for executing a plurality of predefined procedures on a data packet, and further including a data packet distributor coupled to the network processing units for transferring the data packet to the network processing units in sequence by replacing an destination address of the data packet with a plurality of network addresses for indicating locations of the network processing units respectively.
- the data packet distributor performs the actions of determining whether the data packet has been transferred to each of the network processing units, transferring the data packet to a network processing unit after replacing the destination address of the data packet with a corresponding network address if the data packet has not been transferred to the processing unit, and outputting the data packet if the data packet has been transferred to each of the processing units.
- a method for distributing a data packet to a plurality of network processing units in sequence for processing includes determining at a data packet distributing unit whether the data packet has been transferred to each of the network processing units. If the data packet has not been transferred to a network processing unit, the data packet distributing unit operates the steps of replacing a destination address of the data packet with a network address indicating a location of the network processing unit at the data packet distributing unit, and transferring the data packet from the data packet distributing unit to the network processing unit according to the destination address. If the data packet has been transferred to each of the processing units, the data packet distributing unit outputs the data packet.
- FIG. 1 illustrates an exemplary topology of a network distributor for transferring a data packet from a source address to a destination address according to the invention.
- FIG. 2 illustrates an exemplary flow chart of a method of using multiple NAT operations to transfer a data packet from a source address to a destination address.
- FIG. 1 illustrates an exemplary topology of a network device for transferring a data packet from a source address to a destination address.
- a network device e.g., a data packets distributor 102
- the data packets distributor 102 is capable of receiving data packets from either network 1 100 or network 2 104 .
- the data packets distributor 102 also includes a data packet distributing unit 106 and a plurality of network addresses. Each network address indicates an address of an external data packets processing unit, such as P 1 108 , P 2 110 . . . or Pn 112 as shown in FIG. 1 .
- the data packet distributing unit 106 is further in communication with a plurality of external data packets processing units P 1 108 , P 2 110 . . . Pn 112 .
- each of the plurality of external network processing units P 1 108 , P 2 110 . . . Pn 112 is assigned a unique network address.
- the plurality of network addresses can be either statically or dynamically mapped to the plurality of processing units P 1 108 , P 2 110 . . . Pn 112 .
- Each of the plurality of processing units P 1 108 , P 2 110 . . . Pn 112 is capable of performing at least one special processing procedure, such as content-filtering, anti-virus, encryption, decryption anti-spam, etc.
- the data packet distributing unit 106 is further capable of determining which processing unit the data packet needs to be transferred to.
- the data packets distributor 102 is capable of receiving data packets from either the network 1 100 or the network 2 104 .
- the data packet is received at the data packets distributor 102 .
- the destination address of the data packet is replaced by a first network address that indicates a location of a certain network processing unit (e,g, P 1 108 ) among P 1 108 , P 2 110 . . . Pn 112 .
- Replacing the destination address with the first network address is referred to as a first NAT operation herein.
- the data packet is transferred to P 1 108 .
- the data packet is processed, according to some of the procedures that executed by the P 1 108 , such as content-filtering, anti-virus, encryption, decryption anti-spam, etc. After processing, the data packet is transferred back to the data packet distributing unit 106 from P 1 108 .
- the data packet distributing unit 106 After the processed data packet is received at data packet distributing unit 106 , the data packet distributing unit 106 checks whether the data packet needs to be transferred to other processing units for further processing. If further processing procedure is required, the data packet distributing unit 106 may replaces the destination address of the data packet with a second network address that indicates a second processing unit among the plurality of processing units P 1 108 , P 2 110 . . . Pn 112 and transmits the data packet to the second processing unit for further processing. Replacing the destination address with the second network address is also a NAT.
- the data packet distributing unit 106 may replace the current destination address of the data packet with its original destination address (a predefined address). Finally, the data packet is transmitted to the network 2 104 . Replacing the second network address with the destination address is referred to as a second NAT herein.
- the data packets distributor 102 employs multiple NAT operations that contains at least two NAT operations to transfer the data packet from its source address to its destination address.
- the concept of NAT is employed and no CPU or software is involved. Therefore, the goal of a reduced cost and system complexity can be achieved.
- the associated processing units that handle the special processing procedures may check whether the data packet meets security requirements and transmission requirements. If the associated processing units detect that a data packet does not comply with the system security requirement, such as containing some virus, it may drop the data packet and log the dropping of the data packet. If any processing unit among P 1 108 , P 2 110 . . . Pn 112 , drops the data packet, the transmission of the data packet stops.
- FIG. 2 illustrates an exemplary flow chart of a method for using multiple NAT operations to transfer a data packet from a source address indicative of a first location to a destination address indicative of a second location.
- the method includes, receiving a data packet indicative of the first location at a data packet distributing unit, step 202 , transferring the data packet from the data packet distributing unit to a processing unit by employing a first NAT operation, step 204 , processing the data packet at the processing unit, step 206 .
- the method further includes detecting at the processing unit whether the data packet has fulfilled system requirements, step 208 , forwarding the processed packet back to the data packet distributing unit if the data packet has fulfilled the system requirements, step 210 , dropping the processed packet if the data packet has not fulfilled the system requirements, step 216 , receiving the data packet at the data distributing unit, step 212 , and transferring the processed data packet from the data packet distributing unit to the destination address indicative of said second location by using a second NAT operation, step 214 .
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
Description
- This application is a Continuation Application of the co-pending, commonly-owned U.S. patent pplication with Attorney Docket No. O-001.P015/0357, Ser. No. 11/602,669, filed on Nov. 21, 2006, by Zhiming Wang, and entitled “Method and apparatus for distributing data packets by using multi-network address translation”.
- The invention relates to network, and in particular, to a network device for distributing data packets to multiple network addresses.
- NAT is a process for translation of IP address. It enables a local-area network (LAN) to use a first set of network addresses for internal traffic and a second set of network addresses for external traffic. A network device that is capable of performing NAT operations is located preferably where a LAN meets a wide area network (WAN). The most commonly used network address is based on the Internet Protocol, the IP address. The first set of IP addresses for internal traffic can be reused in many different LANs and are not unique. The second set of IP addresses for external traffic are unique and can not be reused by other networks. Each of the first set of IP addresses is assigned to a host in the LAN. Therefore, when a first host in a LAN intends to communicate with a second host on the Internet, it first transmits packets to a network device that is capable of performing NAT operations. In the IP header of each packet, there is a source address and a destination address. The source address is one of the first set of addresses that is assigned to the host and cannot be used outside the LAN. Therefore, in order to transmit the data packet to its destination address, the network device replaces the source address with an address from the second set of addresses which can be used for external communication. The operation of replacing the source address of the packet with an address from the second set of addresses is part of the NAT process. After the NAT, the resulting source address of the packet can be uniquely used for external traffic, such as Internet communication.
- Nowadays, many network devices such as routers, firewalls, and ISDN routers are capable of performing NAT operations. All these devices employ only one NAT operation to transfer a data packet from a source address to a destination address.
- With the rapid development of information technology, the functions provided by network devices are becoming more and more powerful and sophisticated. In today's network devices, besides basic functions, such as routing, many other functions or processing procedures, such as content-filtering, anti-virus, encryption, decryption and anti-spam, can be provided. These additional functions can be accomplished either in one processing unit or in many processing units. Performing some of the functions or processing procedures, such as an anti-virus processing procedure, is very complicated and time-consuming. To solve the problem, these additional processing procedures are usually executed by different processing units. A CPU in the network device is used to distribute data packets to different processing units for processing. However, this distribution method results in a huge consumption of the CPU resource. Thus, the above-mentioned method greatly limits the system performance.
- To solve this problem many solutions, such as using a more powerful CPU, providing extra hardware, and employing software implementation, have been proposed. However, the use of powerful CPU, extra hardware, or extra software implementation increases the system complexity and cost.
- Therefore, it is to an improved solution that is capable of transmitting data packets to various network processing units without increasing the cost and system complexity that the present invention primarily directs.
- The present invention provides a network device that employs multiple NAT operations to transmit data packets to various network processing units. Since the NAT is a standard function of many network devices, the present invention is capable of transferring data packets to various network processing units according to system requirement without extra CPU or software operation. Consequently, system complexity and the cost can be reduced.
- In one embodiment of the invention, there is provided a network device including a plurality of network addresses for indicating locations of a plurality of network processing units, and further including a data packet distributing unit for transferring a data packet to the network processing units in sequence by replacing a destination address of the data packet with the network addresses. The data packet distributing unit performs the actions of determining whether the data packet has been transferred to each of the network processing units, transferring the data packet to a network processing unit after replacing the destination address of the data packet with a corresponding network address if the data packet has not been transferred to the network processing unit, and outputting the data packet if the data packet has been transferred to each of the processing units.
- In another embodiment of the invention, there is also provided a network system including a plurality of network processing units for executing a plurality of predefined procedures on a data packet, and further including a data packet distributor coupled to the network processing units for transferring the data packet to the network processing units in sequence by replacing an destination address of the data packet with a plurality of network addresses for indicating locations of the network processing units respectively. The data packet distributor performs the actions of determining whether the data packet has been transferred to each of the network processing units, transferring the data packet to a network processing unit after replacing the destination address of the data packet with a corresponding network address if the data packet has not been transferred to the processing unit, and outputting the data packet if the data packet has been transferred to each of the processing units.
- In yet another embodiment of the invention, there is also provided a method for distributing a data packet to a plurality of network processing units in sequence for processing. The method includes determining at a data packet distributing unit whether the data packet has been transferred to each of the network processing units. If the data packet has not been transferred to a network processing unit, the data packet distributing unit operates the steps of replacing a destination address of the data packet with a network address indicating a location of the network processing unit at the data packet distributing unit, and transferring the data packet from the data packet distributing unit to the network processing unit according to the destination address. If the data packet has been transferred to each of the processing units, the data packet distributing unit outputs the data packet.
- Features and advantages of embodiments of the invention will become apparent as the following Detailed Description proceeds, and upon reference to the Drawings, where like numerals depict like elements, and in which:
-
FIG. 1 illustrates an exemplary topology of a network distributor for transferring a data packet from a source address to a destination address according to the invention. -
FIG. 2 illustrates an exemplary flow chart of a method of using multiple NAT operations to transfer a data packet from a source address to a destination address. -
FIG. 1 illustrates an exemplary topology of a network device for transferring a data packet from a source address to a destination address. In general, a network device, e.g., adata packets distributor 102, is in communication with afirst network 1 100 and asecond network 2 104. Thedata packets distributor 102 is capable of receiving data packets from eithernetwork 1 100 ornetwork 2 104. Thedata packets distributor 102 also includes a datapacket distributing unit 106 and a plurality of network addresses. Each network address indicates an address of an external data packets processing unit, such asP1 108,P2 110 . . . orPn 112 as shown inFIG. 1 . The datapacket distributing unit 106 is further in communication with a plurality of external data packetsprocessing units P1 108,P2 110 . . .Pn 112. As mentioned above, each of the plurality of external networkprocessing units P1 108,P2 110 . . .Pn 112 is assigned a unique network address. The plurality of network addresses can be either statically or dynamically mapped to the plurality ofprocessing units P1 108,P2 110 . . .Pn 112. Each of the plurality ofprocessing units P1 108,P2 110 . . .Pn 112 is capable of performing at least one special processing procedure, such as content-filtering, anti-virus, encryption, decryption anti-spam, etc. The datapacket distributing unit 106 is further capable of determining which processing unit the data packet needs to be transferred to. - The
data packets distributor 102 is capable of receiving data packets from either thenetwork 1 100 or thenetwork 2 104. When thenetwork 1 100 transfers a data packet that has a source address and a destination address to thenetwork 2 104, the data packet is received at thedata packets distributor 102. At the datapacket distributing unit 106 of thedata packets distributor 102, the destination address of the data packet is replaced by a first network address that indicates a location of a certain network processing unit (e,g, P1 108) amongP1 108,P2 110 . . .Pn 112. Replacing the destination address with the first network address is referred to as a first NAT operation herein. According to the first network address, the data packet is transferred toP1 108. AtP1 108, the data packet is processed, according to some of the procedures that executed by theP1 108, such as content-filtering, anti-virus, encryption, decryption anti-spam, etc. After processing, the data packet is transferred back to the datapacket distributing unit 106 from P1 108. - After the processed data packet is received at data
packet distributing unit 106, the datapacket distributing unit 106 checks whether the data packet needs to be transferred to other processing units for further processing. If further processing procedure is required, the datapacket distributing unit 106 may replaces the destination address of the data packet with a second network address that indicates a second processing unit among the plurality ofprocessing units P1 108,P2 110 . . .Pn 112 and transmits the data packet to the second processing unit for further processing. Replacing the destination address with the second network address is also a NAT. - When the data
packet distributing unit 106 detects that the data packet has been transferred to all the processing units it needs to be transferred to, the datapacket distributing unit 106 may replace the current destination address of the data packet with its original destination address (a predefined address). Finally, the data packet is transmitted to thenetwork 2 104. Replacing the second network address with the destination address is referred to as a second NAT herein. - It is appreciated by those skilled in the art that the in the aforementioned embodiment of the invention, the
data packets distributor 102 employs multiple NAT operations that contains at least two NAT operations to transfer the data packet from its source address to its destination address. In the course of distributing the data packet, the concept of NAT is employed and no CPU or software is involved. Therefore, the goal of a reduced cost and system complexity can be achieved. - For some special processing procedures, such as content-filtering, anti-spam and anti-virus, the associated processing units that handle the special processing procedures may check whether the data packet meets security requirements and transmission requirements. If the associated processing units detect that a data packet does not comply with the system security requirement, such as containing some virus, it may drop the data packet and log the dropping of the data packet. If any processing unit among
P1 108,P2 110 . . .Pn 112, drops the data packet, the transmission of the data packet stops. -
FIG. 2 illustrates an exemplary flow chart of a method for using multiple NAT operations to transfer a data packet from a source address indicative of a first location to a destination address indicative of a second location. The method includes, receiving a data packet indicative of the first location at a data packet distributing unit,step 202, transferring the data packet from the data packet distributing unit to a processing unit by employing a first NAT operation,step 204, processing the data packet at the processing unit,step 206. The method further includes detecting at the processing unit whether the data packet has fulfilled system requirements,step 208, forwarding the processed packet back to the data packet distributing unit if the data packet has fulfilled the system requirements,step 210, dropping the processed packet if the data packet has not fulfilled the system requirements,step 216, receiving the data packet at the data distributing unit,step 212, and transferring the processed data packet from the data packet distributing unit to the destination address indicative of said second location by using a second NAT operation, step 214. - The terms and expressions which have been employed herein are used as terms of description and not of limitation, and there is no intention, in the use of such terms and expressions, of excluding any equivalents of the features shown and described (or portions thereof), and it is recognized that various modifications are possible within the scope of the claims. Other modifications, variations, and alternatives are also possible. Accordingly, the claims are intended to cover all such equivalents.
Claims (22)
Priority Applications (1)
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US12/726,832 US20100183019A1 (en) | 2006-11-21 | 2010-03-18 | Method and apparatus for distributing data packets to multiple network addresses |
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US11/602,669 US7688821B2 (en) | 2006-11-21 | 2006-11-21 | Method and apparatus for distributing data packets by using multi-network address translation |
US12/726,832 US20100183019A1 (en) | 2006-11-21 | 2010-03-18 | Method and apparatus for distributing data packets to multiple network addresses |
Related Parent Applications (1)
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US11/602,669 Continuation US7688821B2 (en) | 2006-11-21 | 2006-11-21 | Method and apparatus for distributing data packets by using multi-network address translation |
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US20100183019A1 true US20100183019A1 (en) | 2010-07-22 |
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US12/726,832 Abandoned US20100183019A1 (en) | 2006-11-21 | 2010-03-18 | Method and apparatus for distributing data packets to multiple network addresses |
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US11/602,669 Expired - Fee Related US7688821B2 (en) | 2006-11-21 | 2006-11-21 | Method and apparatus for distributing data packets by using multi-network address translation |
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TW (1) | TWI356619B (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US7688821B2 (en) * | 2006-11-21 | 2010-03-30 | O2Micro International Ltd. | Method and apparatus for distributing data packets by using multi-network address translation |
US8819066B2 (en) | 2007-12-21 | 2014-08-26 | International Business Machines Corporation | Employing organizational context within a collaborative tagging system |
US8005098B2 (en) * | 2008-09-05 | 2011-08-23 | Cisco Technology, Inc. | Load balancing across multiple network address translation (NAT) instances and/or processors |
EP2169903A1 (en) * | 2008-09-30 | 2010-03-31 | France Telecom | Apparatus and method for routing allowing the translation of addresses in cascade in a network |
CN106060183B (en) * | 2016-05-03 | 2019-05-07 | 新华三技术有限公司 | A kind of address distribution method and device |
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2010
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TW200824368A (en) | 2008-06-01 |
US7688821B2 (en) | 2010-03-30 |
TWI356619B (en) | 2012-01-11 |
US20080117900A1 (en) | 2008-05-22 |
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