WO2011103820A2 - Procédé et appareil de traduction d'adresses réseau - Google Patents

Procédé et appareil de traduction d'adresses réseau Download PDF

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Publication number
WO2011103820A2
WO2011103820A2 PCT/CN2011/072863 CN2011072863W WO2011103820A2 WO 2011103820 A2 WO2011103820 A2 WO 2011103820A2 CN 2011072863 W CN2011072863 W CN 2011072863W WO 2011103820 A2 WO2011103820 A2 WO 2011103820A2
Authority
WO
WIPO (PCT)
Prior art keywords
ipid
address
source
data packet
destination
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2011/072863
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English (en)
Chinese (zh)
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WO2011103820A3 (fr
Inventor
徐靖
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CN201180000517.5A priority Critical patent/CN102232288A/zh
Priority to PCT/CN2011/072863 priority patent/WO2011103820A2/fr
Publication of WO2011103820A2 publication Critical patent/WO2011103820A2/fr
Publication of WO2011103820A3 publication Critical patent/WO2011103820A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates to the field of network technologies, and in particular, to a network address translation method and apparatus. Background technique
  • IPv4 Internet Protocol version 4 addresses are rapidly exhausted, for which the IETF (Internet Engineering Task Force) is in an IPv4 address.
  • a private IP address segment is defined, including: ⁇ . ⁇ . ⁇ . ⁇ , 172.16.xx-172.31.xx, 192.168.xx.
  • These private IP addresses can be used to build private networks (internal networks), such as companies and enterprise internal networks, thus greatly reducing the need for public network addresses, and to some extent, solving the problem of public network IP address exhaustion, but these private The IP address cannot be routed on the public network (Internet).
  • a NAT Network Address Translation
  • Port multiplexing converts "private IP address + port number" into "public network IP address + new port number".
  • IP address is replaced with the same public IP address, but with different ports.
  • Ports are multiplexed. All hosts on the internal network can share a valid public IP address to access the Internet. This saves public IP address resources and hides all hosts in the network. Attack from the internet.
  • the quintuple is the source IP address + source port number (TCP or UDP port number) + destination IP address + destination port number + IP protocol number can uniquely identify a traffic.
  • TCP Transmission Control Protocol
  • UDP User Datagram Protocol
  • the quintuple is the source IP address + source port number (TCP or UDP port number) + destination IP address + destination port number + IP protocol number can uniquely identify a traffic.
  • MTU Maximum Transmission Unit
  • the packet is fragmented so that the length of each fragmented packet does not exceed the MTU of the line.
  • the TCP or UDP packet is fragmented, only the first packet has a TCP or UDP header.
  • the subsequent fragment packet has only an IP header.
  • the destination device such as the server, generally performs packet reassembly based on the triplet: source IP address + destination IP address + IP packet identifier (IPID). Since the identifiers of the IP packets sent by the source host are generally incremented one by one, the identifiers of the IP packets sent by different source hosts may be identical. After NAT address replacement, multiple different streams (determined by quintuple) may have the same source IP address and destination IP address, and these packets also have the same IPID, in which case the destination device An error occurs when the packet is reorganized. Summary of the invention
  • embodiments of the present invention provide a network address translation method and apparatus, so as to ensure that no error occurs when the destination device performs packet reassembly.
  • An embodiment of the present invention provides a network address translation method, where the method includes: a network address translation NAT device receives a data packet sent by an intranet host; parses the data packet, and obtains a first source Internet protocol included in the data packet. The IP address, the first source port, the first destination IP address, and the identifier IPID of the first IP data packet; processing the first source IP address and the first source port in the data packet, including: converting the first source IP address For the second source IP address, converting the first source port to the second source port; processing the first IPID in the data packet; and transmitting the processed data packet according to the first destination IP address.
  • An embodiment of the present invention further provides a network address translation apparatus, where the apparatus includes:
  • the parsing unit (502) is configured to parse the data packet, and obtain the first source Internet Protocol IP address, the first source port, the first destination IP address, and the identifier IPID of the first IP data packet included in the data packet;
  • the address conversion unit (503) is configured to convert the first source IP address in the data packet to the second source IP address, and convert the first source port to the second source port;
  • the sending unit (505) is configured to send the processed data packet to the destination IP address.
  • the network address translation method and device provided by the present invention can simultaneously process the IPID of the data packet when the address is replaced on the NAT device, so that the destination device does not generate an error when the data packet is reassembled.
  • FIG. 1 is a schematic diagram of an application scenario provided by an embodiment of the present invention.
  • 2 is a flowchart of a network address translation method according to an embodiment of the present invention
  • 3 is a flowchart of a network address translation method according to another embodiment of the present invention
  • FIG. 4 is a flowchart of a network address translation method according to another embodiment of the present invention.
  • FIG. 5 is a block diagram of a network address translation apparatus according to an embodiment of the present invention.
  • 6a, 6b are block diagrams of a network address translation apparatus according to another embodiment of the present invention.
  • FIG. 7a and 7b are block diagrams of a network address translation apparatus according to another embodiment of the present invention. detailed description
  • FIG. 1 is a schematic diagram of an application scenario of the embodiment of the present invention.
  • the intranet hosts 101 and 102 access the public network server 104 through the NAT device 103, wherein the address of the intranet host 101 is 10.1. 1.100, the address of the intranet host 102 is 10.1.1.200, and the public network address of the public network server 104 is
  • the NAT device 103 assigns the same public IP address to the intranet hosts 101 and 102.
  • 162.105.178.65, and different port numbers 16384 and 16400 are assigned to the intranet hosts 101 and 102 respectively, so the public network server 104 can distinguish the traffic of the two hosts.
  • the packet is divided into multiple fragments that do not exceed the MTU.
  • the packet sent by the intranet host 101 or 102 is fragmented, only the first piece of the stationery active port number is 16384 or 16400, and the subsequent fragment does not include the source port number.
  • the public network server 104 can only perform packet reassembly according to the triplet: source IP address 162.105.178.65, destination IP address 211.100.7.34, and IPID.
  • the network address translation method includes:
  • the NAT device receives a data packet sent by an intranet host.
  • S202. Parse the data packet, and obtain a first source IP address, a first source port, a first destination IP address, and a first IPID included in the data packet.
  • S203 Processing the first source IP address and the first source port in the data packet, including: converting the first source IP address in the data packet to the second source IP address, and converting the first source port to the second source port.
  • the NAT device allocates a public network IP address and a new port to the data packet sent by the intranet host, and converts the private network IP address and the source port in the data packet sent by the intranet host into the public network IP address. And the new end ⁇ .
  • the NAT device processes the first IPID in the data packet, so that the IPID does not repeat when the data packet sent by the NAT device to the destination device has the same source IP address and destination IP address. Therefore, when the destination device reassembles the received data packet, no reorganization error occurs due to the duplicate IPID.
  • FIG. 3 is a flowchart of a network address translation method according to another embodiment of the present invention. As shown in FIG. 3, the network address translation method includes:
  • the NAT device receives a data packet sent by an intranet host.
  • the NAT device 103 can receive at least one of the intranet hosts 101 and 102 and send the data packet to the public network server 104.
  • the NAT device 103 receives the data packets sent by the intranet hosts 101 and 102 to the public network server 104 as an example.
  • S302 Parse the data packet, and obtain a first source IP address, a first source port, a first destination IP address, and a first IPID included in the data packet.
  • the NAT device 103 parses the received data packets sent by the intranet hosts 101 and 102 to the public network server 104, and obtains the first source IP address, the first source port, the first destination IP address, and the data packet.
  • the first IPID where the intranet host 101 sends the data packet, the first source IP address is 10.1.1.100, the first source port is 1025, the first destination IP address is 211.10.0.7.34, and the first IPID is 9527.
  • the first destination port 24 included in the data packet may also be obtained.
  • S303 Convert the first source IP address in the data packet to the second source IP address, and convert the first source port to the second source port.
  • the NAT device 103 allocates a public network IP address and a new port to the data packet sent by the intranet host 101, and converts the first source IP address 10.1.1.100 and the first source port 1025 in the data packet into a public network IP address, respectively.
  • the NAT device 103 determines whether there is an IPID storage table corresponding to the public network IP address 162.105.178.65 and the first destination IP address 211.100.7.34.
  • the NAT device 103 determines that there is no IPID storage table corresponding to the public network IP address 162.105.178.65 and the first destination IP address 211.10.0.7.34
  • the NAT device 103 can be based on the public network IP address 162.105.178.65 and the first The destination IP address 211.10.0.7.34 establishes an IPID storage table, which includes a second source IP address (ie, a public network IP address in this example), a first destination IP address, and an IPID (see Table 1 below).
  • the initial value of the IPID is 0, and the value of the IPID is increased by 1 for each subsequent data packet sent by the NAT device 103.
  • the initial value may also be set after each transmission.
  • the data of the IPID is decremented by one, which is not limited by the embodiment of the present invention.
  • the length of the IPID value in the IPID storage table may be set, for example, may be 16 bits, and then returned to the initial value after overflow.
  • Processing the first IPID in the data packet including: converting the first IPID in the data packet to the second IPID according to the IPID storage table corresponding to the second source IP address and the first destination IP address, where the foregoing
  • the second IPID is the IPID contained in the IPID storage table.
  • the NAT device 103 determines that there is an IPID storage table corresponding to the public network IP address 162.105.178.65 and the first destination IP address 211.10.0.7.34. As shown in Table 1, the NAT device 103 is based on the public network IP address 162.105. 178.65 The IPID storage table corresponding to the first destination IP address 211.10.0.7.34, and replace the first IPID (9527) in the data packet with the IPID (0) contained in the storage table.
  • the NAT device 103 sends the processed data packet to the first destination IP address, that is, the public network server 104.
  • the value of the IPID in the IPID storage table may also be incremented or decremented by one.
  • the IPID storage table processes the IPID of the data packet so that the IPID does not overlap, so that when the destination device reassembles the received data packet, no reorganization error occurs due to duplicate IPID.
  • 4 is a flowchart of a network address translation method according to an embodiment of the present invention. As shown in FIG. 4, the network address translation method includes:
  • the NAT device receives a data packet sent by an intranet host.
  • the NAT device 103 receives the data packets sent by the intranet hosts 101 and 102 to the public network server 104.
  • S402. Parse the data packet, and obtain a first source IP address, a first source port, a first destination IP address, and a first IPID included in the data packet.
  • the NAT device 103 parses the received data packets sent by the intranet hosts 101 and 102 to the public network server 104, and obtains the first source IP address, the first source port, the first destination IP address, and the data packet.
  • the NAT device 103 allocates a public network IP address and a new port to the data packet sent by the intranet host 101, and converts the first source IP address 10.1.1.100 and the first source port 1025 in the data packet into a public network IP address, respectively.
  • S404 Determine whether there is an IPID storage table corresponding to the second source IP address and the first destination IP address. If the corresponding IPID storage table does not exist, S405 is performed; if there is a corresponding IPID storage table, S406 is performed.
  • the NAT device 103 determines whether there is an IPID storage table corresponding to the public network IP address 162.105.178.65 and the first destination IP address 211.100.7.34.
  • IPID storage table corresponding to the second source IP address and the first destination IP address.
  • the NAT device 103 determines that there is no IPID storage table corresponding to the public network IP address 162.105.178.65 and the first destination IP address 211.10.0.7.34
  • the NAT device 103 can be based on the public network IP address 162.105.178.65 and the first
  • the destination IP address 211.10.0.7.34 establishes an IPID storage table, which includes a second source IP address (ie, a public network IP address in this example), a first destination IP address, and an IPID (see Table 2 below).
  • the established IPID storage table may include one or more IPIDs, for example, may be stored. 128 IPIDs.
  • S406. Determine whether the IPID storage table corresponding to the second source IP address and the first destination IP address includes an IPID equal to the first IPID in the data packet.
  • S407 is performed.
  • the NAT device 103 acquires the IPID storage table according to the new source IP address 162.105.178.65 and the destination IP address 211.10.0.7.34. The IPID corresponding to the new source IP address and destination IP address,
  • the IPID stored in the storage table includes an IPID equal to the first IPID in the data packet, it indicates that the first IPID of the data packet may be duplicated with the previously sent data packet, resulting in the public network server.
  • 104 receives the data packet whose source IP address, destination IP address, and IPID are the same, thereby causing an error in reassembly.
  • the NAT device 103 converts the first IPID in the data packet to ensure the IPID storage table.
  • the stored IPID is different from the converted second IPID, so that the IPIDs in the recently transmitted N packets do not conflict.
  • a random number may be used to allocate a new IPID to the data packet, and at the same time ensure that the new IPID is different from the IPID stored in the IPID storage table.
  • S408 Store the second IPID in the data packet in the IPID storage table corresponding to the second source IP address and the first destination IP address, and execute S410.
  • the processing of the first IPID in the data packet includes: storing the first IPID in the data packet in the IPID storage table corresponding to the second source IP address and the first destination IP address, and executing S410.
  • the IPID of the sent data packet is stored in
  • N IPIDs can be stored for a new set of source IP addresses and destination IP addresses.
  • N can be set to 128, so that the N most recently used IPIDs can be stored in the IPID storage table.
  • the NAT device 103 sends the processed data packet to the destination IP address, that is, the public network server 104.
  • FIG. 5 is a block diagram of a network address translation apparatus according to an embodiment of the present invention. As shown in FIG. 5, the network address translation apparatus 500 includes:
  • the receiving unit 501 is configured to receive a data packet sent by the intranet host.
  • the parsing unit 502 is configured to parse the data packet, and obtain a first source IP address, a first source port, a first destination IP address, and a first IPID included in the data packet.
  • the address conversion unit 503 is configured to convert the first source IP address in the data packet to the second source IP address, and convert the first source port to the second source port.
  • the IPID processing unit 504 is configured to process the first IPID in the data packet.
  • the sending unit 505 is configured to send the processed data packet to the destination IP address.
  • the network address translation device of the embodiment of the present invention processes the IPID of the data packet at the same time when the address is replaced on the NAT device, so that the destination device does not generate an error when the data packet is reassembled.
  • the foregoing network address translation apparatus may further include:
  • the first ID determining unit 604 is configured to determine whether there is an IPID storage table corresponding to the second source IP address and the first destination IP address, and if there is no corresponding IPID storage table, triggering the first establishing unit 605; if there is a corresponding The IPID storage table triggers the IPID processing unit 504.
  • the first establishing unit 605 is configured to establish an IPID storage table corresponding to the second source IP address and the first destination IP address.
  • the foregoing IPID processing unit 504 may include:
  • the first obtaining module 5041 is configured to obtain a second IPID, where the second IPID is an IPID included in an IPID storage table corresponding to the second source IP address and the first destination IP address;
  • the first conversion module 5042 is configured to convert the first IPID in the data packet to the second IPID.
  • the network address translation apparatus processes the IPID of the data packet according to the IPID storage table, so that the IPID does not overlap, thereby ensuring that the destination device does not reorganize the IPID when the received data packet is reorganized. error.
  • the foregoing network address translation apparatus may further include:
  • the second ID determining unit 704 is configured to determine whether there is an IPID storage table corresponding to the second source IP address and the first destination IP address, if there is no corresponding IPID storage table, triggering the second establishing unit 705; if there is a corresponding The IPID storage table triggers the IPID processing unit 504.
  • the second establishing unit 705 is configured to establish an IPID storage table corresponding to the second source IP address and the first destination IP address.
  • the storage table updating unit 706 is configured to store the first IPID in the data packet in the IPID storage table.
  • the foregoing IPID processing unit 504 may include:
  • the second obtaining module 5043 is configured to obtain an IPID stored in an IPID storage table corresponding to the second source IP address and the first destination IP address.
  • the determining module 5044 is configured to determine whether the acquired IPID includes an IPID equal to the first IPID in the data packet, and if so, triggering the second converting module 5045; if not, triggering the storage table updating unit 706.
  • the second conversion module 5045 is configured to convert the first IPID in the data packet into a second IPID, where the second IPID and the IPID stored in the IPID storage table are different.
  • the update module 5046 is configured to store the second IPID in the data packet in the IPID storage table.
  • the network address translation apparatus processes the IPID of the data packet according to the IPID storage table, so that the IPID does not overlap, thereby ensuring that the destination device does not reorganize the IPID when the received data packet is reorganized. error.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)

Abstract

L'invention concerne un procédé et un appareil de traduction d'adresses réseau (NAT). Selon ce procédé : un dispositif NAT reçoit un paquet de données transmis par un hôte intranet ; analyse le paquet de données ; obtient une première adresse de protocole Internet (IP) d'origine, un premier port d'origine, une première adresse IP de destination et un premier identifiant de paquet de données IP (IPID) contenu dans le paquet de données ; effectue un traitement consistant à traduire la première adresse IP d'origine en une deuxième adresse IP d'origine et à traduire le premier port d'origine en un deuxième port d'origine, pour la première adresse IP d'origine et le premier port d'origine dans le paquet de données ; effectue le traitement pour le premier IPID dans le paquet de données ; et transmet le paquet de données traité en fonction de la première adresse IP de destination. Le procédé et l'appareil de traduction d'adresses réseaux selon l'invention permettent de modifier les IPID de messages en même temps que la traduction d'adresses est réalisée par le dispositif NAT, ce qui évite toute erreur lorsqu'un dispositif de destination effectue une recombinaison de messages.
PCT/CN2011/072863 2011-04-15 2011-04-15 Procédé et appareil de traduction d'adresses réseau Ceased WO2011103820A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201180000517.5A CN102232288A (zh) 2011-04-15 2011-04-15 一种网络地址转换方法及装置
PCT/CN2011/072863 WO2011103820A2 (fr) 2011-04-15 2011-04-15 Procédé et appareil de traduction d'adresses réseau

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2011/072863 WO2011103820A2 (fr) 2011-04-15 2011-04-15 Procédé et appareil de traduction d'adresses réseau

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WO2011103820A2 true WO2011103820A2 (fr) 2011-09-01
WO2011103820A3 WO2011103820A3 (fr) 2012-03-22

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3065380A1 (fr) * 2011-10-06 2016-09-07 QUALCOMM Incorporated Systèmes et procédés de traitement de paquet de données
CN106789666A (zh) * 2016-11-22 2017-05-31 东软集团股份有限公司 一种确定转换后端口的方法和装置
CN114205328A (zh) * 2021-12-11 2022-03-18 英赛克科技（北京）有限公司 一种opc数据转发方法及装置
CN115550044A (zh) * 2022-10-09 2022-12-30 浙江中控技术股份有限公司 消息转发方法、装置、设备及存储介质

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CN108259645A (zh) * 2018-02-05 2018-07-06 深圳市三旺通信技术有限公司 基于轨交车载运用的网络地址转换方法
CN111953807B (zh) * 2020-07-30 2022-02-22 新华三信息安全技术有限公司 一种报文标识处理方法、装置及存储介质
CN114531417B (zh) * 2020-10-30 2023-09-22 华为技术有限公司 一种通信方法及装置
CN115022423A (zh) * 2022-06-22 2022-09-06 上海弘积信息科技有限公司 一种负载均衡设备中IPv4标识分配方法

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US6006272A (en) * 1998-02-23 1999-12-21 Lucent Technologies Inc. Method for network address translation
CN1960316A (zh) * 2005-11-04 2007-05-09 华为技术有限公司 分片报文的网络地址转换方法
CN101567852B (zh) * 2009-05-20 2011-08-24 中兴通讯股份有限公司 Ip报文网络地址转换的方法及装置

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3065380A1 (fr) * 2011-10-06 2016-09-07 QUALCOMM Incorporated Systèmes et procédés de traitement de paquet de données
CN106789666A (zh) * 2016-11-22 2017-05-31 东软集团股份有限公司 一种确定转换后端口的方法和装置
CN106789666B (zh) * 2016-11-22 2020-05-08 东软集团股份有限公司 一种确定转换后端口的方法和装置
CN114205328A (zh) * 2021-12-11 2022-03-18 英赛克科技（北京）有限公司 一种opc数据转发方法及装置
CN114205328B (zh) * 2021-12-11 2023-06-02 英赛克科技（北京）有限公司 一种opc数据转发方法及装置
CN115550044A (zh) * 2022-10-09 2022-12-30 浙江中控技术股份有限公司 消息转发方法、装置、设备及存储介质

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