CN113794703A - Method for acquiring client IP in load balancing system - Google Patents
Method for acquiring client IP in load balancing system Download PDFInfo
- Publication number
- CN113794703A CN113794703A CN202111010992.2A CN202111010992A CN113794703A CN 113794703 A CN113794703 A CN 113794703A CN 202111010992 A CN202111010992 A CN 202111010992A CN 113794703 A CN113794703 A CN 113794703A
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- client
- server
- real
- load balancer
- load balancing
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000000284 extract Substances 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 2
- 230000026676 system process Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
- H04L69/163—In-band adaptation of TCP data exchange; In-band control procedures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
- H04L67/1004—Server selection for load balancing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/06—Notations for structuring of protocol data, e.g. abstract syntax notation one [ASN.1]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
Abstract
The invention discloses a method for obtaining client IP in a load balancing system, which enables a server to obtain a real client IP address under the condition of using a load balancer, thereby enabling services needing to use the client IP to work normally; the method and the device solve the problem that the client IP address is converted into the load balancer IP due to the use of the load balancer, so that the client IP address cannot be acquired, and further the loss is caused.
Description
Technical Field
The invention relates to the technical field of load balancing, in particular to a method for acquiring a client IP in a load balancing system.
Background
Load balancing is a key component of the highly available network infrastructure, and is typically used to distribute workload across multiple servers to improve the performance and reliability of a website, application, database, or other service. Currently, if a user is directly connected to a web server, the user naturally has no way to access the web server if the server is down. In addition, if many users attempt to access the server at the same time, beyond the limit they can handle, slow loading or no connection at all may occur.
This failure can be mitigated by introducing a load balancer and additional web servers. Typically, all backend servers will guarantee the same content to be provided so that the user receives consistent content regardless of which server responds. The load is shared by the additional multiple web servers, so that the pressure of a single web server is relieved, and more user requests are processed; the load balancing device may be software or a dedicated hardware device.
IP Address (english: IP Address) is a string of numbers in Internet Protocol (Internet Protocol) used to identify a device that transmits or receives a datagram.
IP addresses consist of 32-bit binary numbers and are often represented for ease of use in the form xxx.xxx.xxx.xxx.xxx.xxx, each group XXX representing a 10-ary number less than or equal to 255, this representation being referred to as dot decimal.
In the existing load balancing system process, a source address in a data packet received by a real server is a load balancer IP, while in practical application, some services need to obtain a real client IP address, but due to the use of the load balancer, the client IP address is converted into the load balancer IP, so that the services cannot be obtained, and further the services fail. Therefore, a method for acquiring the client IP in the load balancing system becomes a problem to be solved urgently.
Disclosure of Invention
The technical problem to be solved by the invention is a method for acquiring a client IP in a load balancing system.
In order to solve the above technical problems, the technical solution provided by the present invention is a method for obtaining a client IP in a load balancing system, comprising the following steps:
the method comprises the following steps: when a data packet sends a request from a client to reach a load balancer, the load balancer extracts a real client IP address from the data packet, and records the real client IP address as a method for acquiring a client IP in a load balancing system, B, C and D;
step two: converting the method B, C and D for acquiring the client IP in the load balancing system into 4 bytes which are respectively marked as h1, h2, h3 and h 4;
step three: constructing 8-byte data, and inserting the 8-byte data into a TCP option field in a data packet sent to a real server according to a certain format;
step four: the real server receives the data packet, analyzes the TCP option field, and extracts h1, h2, h3 and h4 according to a preset format;
step five: and the real server restores the real client IP according to h1, h2, h3 and h 4.
As an improvement, the data format of the 8 bytes is: 0x1c, 0x07, 0x01, h1, h2, h3, h4, 0x 01.
As an improvement, a server pool is configured on the load balancer in advance, and a plurality of servers are contained in the server pool.
As an improvement, after the request of the client reaches the load balancer, the load balancer may select any server from the service pool, and forward the request to the server for processing.
Compared with the prior art, the invention has the advantages that: under the condition of using the load balancer, the invention enables the server to obtain the real IP address of the client, thereby enabling the service needing to use the IP of the client to work normally; the method and the device solve the problem that the client IP address is converted into the load balancer IP due to the use of the load balancer, so that the client IP address cannot be acquired, and further the loss is caused.
Drawings
Fig. 1 is a schematic diagram of a method for acquiring a client IP in a load balancing system according to the present invention.
Fig. 2 is a schematic diagram of load balancing operation of a method for acquiring a client IP in a load balancing system according to the present invention.
Detailed Description
The method for acquiring the client IP in the load balancing system of the present invention is further described in detail with reference to the accompanying drawings.
With reference to fig. 1-2, a method for obtaining a client IP in a load balancing system includes the following steps:
the method comprises the following steps: when a data packet sends a request from a client to reach a load balancer, the load balancer extracts real client IP addresses from the data packet, and the real client IP addresses are marked as A, B, C and D;
step two: converting A, B, C and D into 4 bytes which are respectively marked as h1, h2, h3 and h 4;
step three: constructing 8-byte data, and inserting the 8-byte data into a TCP option field in a data packet sent to a real server according to a certain format;
step four: the real server receives the data packet, analyzes the TCP option field, and extracts h1, h2, h3 and h4 according to a preset format;
step five: and the real server restores the real client IP according to h1, h2, h3 and h 4.
The data format of the 8 bytes is as follows: 0x1c, 0x07, 0x01, h1, h2, h3, h4, 0x 01.
A server pool is configured in advance on the load balancer, and the server pool comprises a plurality of servers.
After the request of the client reaches the load balancer, the load balancer can select any server from the service pool and forward the request to the server for processing.
The specific implementation process of the method for acquiring the client IP in the load balancing system is as follows:
1) the client sends a data packet to the load balancer, and the IP of the carrying source is 192.168.1.100
2) Extracting the client ip, converting into 4 bytes: 0xc0,0xa8,0x01,0x64
3) Constructing 8 bytes of data:
| 0x1c | 0x07 | 0x01 | 0xc0 | 0xa8 | 0x01 | 0x64 | 0x01 |
4) the 8 bytes of data are inserted into a TCP option field in a data packet sent to the real server.
5) The real server receives the data packet and extracts 0xc0,0xa8,0x01 and 0x64
6) The real server restores the IP of the client to 192.168.1.100
The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A method for obtaining client IP in a load balancing system is characterized in that: the method comprises the following steps:
the method comprises the following steps: when a data packet sends a request from a client to reach a load balancer, the load balancer extracts real client IP addresses from the data packet, and the real client IP addresses are marked as A, B, C and D;
step two: converting A, B, C and D into 4 bytes which are respectively marked as h1, h2, h3 and h 4;
step three: constructing 8-byte data, and inserting the 8-byte data into a TCP option field in a data packet sent to a real server according to a certain format;
step four: the real server receives the data packet, analyzes the TCP option field, and extracts h1, h2, h3 and h4 according to a preset format;
step five: and the real server restores the real client IP according to h1, h2, h3 and h 4.
2. The method for obtaining the client IP in the load balancing system according to claim 1, wherein: the data format of the 8 bytes is as follows: 0x1c, 0x07, 0x01, h1, h2, h3, h4, 0x 01.
3. The method for obtaining the client IP in the load balancing system according to claim 1, wherein: a server pool is configured in advance on the load balancer, and the server pool comprises a plurality of servers.
4. The method of claim 3, wherein the method for obtaining the client IP in the load balancing system comprises: after the request of the client reaches the load balancer, the load balancer can select any server from the service pool and forward the request to the server for processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111010992.2A CN113794703A (en) | 2021-08-31 | 2021-08-31 | Method for acquiring client IP in load balancing system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111010992.2A CN113794703A (en) | 2021-08-31 | 2021-08-31 | Method for acquiring client IP in load balancing system |
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| Publication Number | Publication Date |
|---|---|
| CN113794703A true CN113794703A (en) | 2021-12-14 |
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| CN202111010992.2A Pending CN113794703A (en) | 2021-08-31 | 2021-08-31 | Method for acquiring client IP in load balancing system |
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Citations (9)
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|---|---|---|---|---|
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| CN103297552A (en) * | 2012-03-02 | 2013-09-11 | 百度在线网络技术（北京）有限公司 | Method and device for transmitting IPv4 address and port of client-side to back-end server |
| US20140108661A1 (en) * | 2012-10-17 | 2014-04-17 | Alibaba Group Holding Limited | System, method and apparatus of data interaction under load balancing |
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| CN112437127A (en) * | 2020-11-10 | 2021-03-02 | 新华三大数据技术有限公司 | Message processing method and device, load balancer and server |
| CN113014490A (en) * | 2021-02-25 | 2021-06-22 | 杭州迪普科技股份有限公司 | IP message forwarding method and device |
-
2021
- 2021-08-31 CN CN202111010992.2A patent/CN113794703A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103297407A (en) * | 2012-03-02 | 2013-09-11 | 百度在线网络技术（北京）有限公司 | Method and device for transmitting IPv6 address and port of client-side to back-end server |
| CN103297552A (en) * | 2012-03-02 | 2013-09-11 | 百度在线网络技术（北京）有限公司 | Method and device for transmitting IPv4 address and port of client-side to back-end server |
| US20140108661A1 (en) * | 2012-10-17 | 2014-04-17 | Alibaba Group Holding Limited | System, method and apparatus of data interaction under load balancing |
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Application publication date: 20211214 |