CN102932490B - IP address conversion method, device, network address translation apparatus and Verification System - Google Patents
IP address conversion method, device, network address translation apparatus and Verification System Download PDFInfo
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Abstract
Disclosure one IP address conversion method, device, network address translation apparatus and Verification System, relate to field of IP network technology. The method includes: the IP address in private IP address pond and public ip address pond is ranked up respectively; Publicly-owned address reusability is obtained according to port range and port block size; The public ip address to distribute position in public ip address pond is determined according to private IP address position in private IP address pond and publicly-owned address reusability, so that it is determined that the public ip address to distribute and corresponding port block. The present invention proposes the thought of fixing mapping, and propose the method and apparatus that fast address maps, substantially increase equipment or the speed of system generation mapping table, eliminate the interaction between conversion equipment and Verification System simultaneously, there is operability and practicality.
Description
Technical field
The present invention relates to field of IP network technology, particularly relate to IP address conversion method, device, network address translation apparatus and Verification System.
Background technology
Along with publicly-owned IPv4 address is about to exhaustion, the application of private ip v4 address will be more and more extensive gradually, and the deployment of network address translation apparatus also can become increasingly prevalent. When user uses private IP address to surf the Net, network address translation apparatus can convert public ip address to the private address of user, and according to the application corresponding port of distribution that user uses, conversion equipment can generate the mapping relations list item of a private IP address and public ip address, port, stores the mapping relations table of private IP address and public ip address, port in network address translation apparatus.
When user surfs the Net, usual network address translation apparatus distributes an address randomly according to the private IP address of user from public ip address pond, one port of random assortment again, form the mapping relations of private IP address and public ip address, port, the mapping relations that this mode generates need to inform in real time Verification System, in order to retain identical mapping relations in Verification System.
In network address translation apparatus, private IP address is with how the mapping relations table of public ip address, port generates, and how the mapping relations in Verification System keep the technical problem of right and wrong the normally off key consistent with network address translation apparatus.
Summary of the invention
The technical problem that the invention solves the problems that is to provide a kind of fast address mapping method and device.
According to an aspect of the present invention, it is provided that a kind of IP address conversion method, including: the IP address in private IP address pond and public ip address pond is ranked up respectively; Publicly-owned address reusability is obtained according to port range and port block size; The public ip address to distribute position in described public ip address pond is determined according to private IP address position in described private IP address pond and described publicly-owned address reusability, so that it is determined that the public ip address to distribute.
Preferably, the method also includes: determine, according to described private IP address position in described private IP address pond and described publicly-owned address reusability, the port block that described private address maps.
Preferably, described obtain publicly-owned address reusability m according to port range and port block size particularly as follows:
M=int ((n2-n1+1)/n)
Wherein, int represents downward rounding operation, and (n1, n2) represents port range, and n1 is for starting port, and n2 is for terminating port, and n is port block size.
Preferably, described position according to private IP address in described private IP address pond and described publicly-owned address reusability determine that the public ip address to distribute position in described public ip address pond comprises determining that described private IP address sequence P in described private IP address pond; The public ip address to distribute sequence Q=int ((P-1)/m)+1 in described public ip address pond is determined according to described sequence P and described publicly-owned address reusability m; The described public ip address to distribute position in described public ip address pond is determined according to the described public ip address to distribute sequence Q in described public ip address pond.
Preferably, network address translation apparatus and Verification System adopt said method to generate mapping table so that network address translation apparatus keeps consistent with the address mapping table of Verification System.
According to a further aspect in the invention, it is provided that a kind of IP address converting device, including: address sort module, for the IP address in private IP address pond and public ip address pond is ranked up respectively; Reusability acquisition module, for obtaining publicly-owned address reusability according to port range and port block size; Address mapping module, for determining the public ip address to distribute position in described public ip address pond according to private IP address position in described private IP address pond and described publicly-owned address reusability, so that it is determined that the public ip address to distribute.
Preferably, this device also includes: port determines module, for determining, according to described private IP address position in described private IP address pond and described publicly-owned address reusability, the port block that described private address maps.
Preferably, described reusability acquisition module obtain publicly-owned address reusability m according to port range and port block size particularly as follows:
M=int ((n2-n1+1)/n)
Wherein, int represents downward rounding operation, and (n1, n2) represents port range, and n1 is for starting port, and n2 is for terminating port, and n is port block size.
Preferably, described address mapping module includes: private address position determination unit, for determining described private IP address sequence P in described private IP address pond; Publicly-owned address position determination unit, for determining the public ip address to distribute sequence Q=int ((P-1)/m)+1 in described public ip address pond according to described sequence P and described publicly-owned address reusability m; Publicly-owned address determination unit, for determining the described public ip address to distribute position in described public ip address pond according to the described public ip address to distribute sequence Q in described public ip address pond, so that it is determined that the public ip address to distribute.
According to another aspect of the invention, also provide for including network address translation apparatus and the Verification System of above-mentioned IP address converting device.
IP address conversion method provided by the invention and device, according to parameters such as the private IP address pond of configuration, public ip address pond, port range and port block sizes, calculate public ip address corresponding to private IP address and port block as requested, achieve the quick mapping method between private IP address and public ip address, substantially increase equipment or the speed of system generation mapping table.
Accompanying drawing explanation
Fig. 1 illustrates the flow chart of an embodiment of the IP address conversion method of the present invention;
Fig. 2 illustrates that the IP address conversion method according to the present invention carries out private IP address and public ip address fixes the schematic diagram of mapping;
Fig. 3 illustrates the flow chart of another embodiment of the IP address conversion method of the present invention;
Fig. 4 illustrates the structure chart of an embodiment of the IP address converting device of the present invention;
Fig. 5 illustrates the structure chart of another embodiment of the IP address converting device of the present invention;
Fig. 6 illustrates the example that the private IP address according to the present invention maps to public ip address;
Fig. 7 illustrates another example that the private IP address according to the present invention maps to public ip address;
Fig. 8 illustrates another example that the private IP address according to the present invention maps to public ip address.
Detailed description of the invention
With reference to the accompanying drawings the present invention is described more fully, the exemplary embodiment of the present invention is wherein described.
Fig. 1 illustrates the flow chart of an embodiment of the IP address conversion method of the present invention.
As it is shown in figure 1, step 102, respectively the IP address in private IP address pond and public ip address pond is ranked up.
Step 104, obtains publicly-owned address reusability according to port range and port block size. Such as obtain publicly-owned address reusability m with according to port range and port block size:
M=int ((n2-n1+1)/n)
Wherein, int represents downward rounding operation, and (n1, n2) represents port range, and n1 is for starting port, and n2 is for terminating port, and n is port block size.
Step 106, determines the public ip address to distribute position in public ip address pond according to private IP address position in private IP address pond and publicly-owned address reusability. In one embodiment, it is determined that private IP address sequence P in private IP address pond; The public ip address to distribute sequence Q=int ((P-1)/m)+1 in public ip address pond is determined according to sequence P and publicly-owned address reusability m; According to the public ip address to distribute in public ip address pond sequence Q determine the public ip address to distribute position in public ip address pond.
Step 108, determines, according to the public ip address to distribute position in public ip address pond, the public ip address to distribute.
According to one embodiment of present invention, determine, always according to private IP address position in private IP address pond and publicly-owned address reusability, the port block that private address maps.
In above-described embodiment, thought based on fixing mapping, according to parameters such as the private IP address pond of configuration, public ip address pond, port range and port block sizes, calculate public ip address corresponding to private IP address and port block as requested, achieve the quick mapping method between private IP address and public ip address, substantially increase equipment or the speed of system generation mapping table.
Fig. 2 illustrates that the IP address conversion method according to the present invention carries out private IP address and public ip address fixes the schematic diagram of mapping. As illustrated in fig. 2, it is assumed that for the arbitrary address a in private IP address pond, it is mapped to the address A in public ip address pond, distribute corresponding port block [u, v] simultaneously:
A--> (A, [u, v])
Configuration private IP address pond, address pool can be made up of 1 or multiple private IP address section, such as according to the size of IP address, address field is ranked up from small to large: (a1, b1), (a2, b2) ... wherein a, b represent the beginning of each address field, end address, it is possible to adopt binary system, hexadecimal or decimal representation.
Configuration public ip address pond, address pool can be made up of one or more discontinuous public ip address sections, according to address size, address field is ranked up from small to large: (A1, B1), (A2, B2) ... .. wherein A, B represent the beginning of each address field, end address, it is possible to adopt binary system, hexadecimal or decimal scale.
Configuration port block size n. N is the publicly-owned address port block size distributing to user after mapping, it is possible to being arranged as required to default port block size is 4096.
Configuration port range (n1, n2). Mark may be used for the port range mapped, and n1, n2 represent beginning port respectively and terminate port.
Fig. 3 illustrates the flow chart of another embodiment of the IP address conversion method of the present invention. As it is shown on figure 3, this embodiment to implement flow process as follows:
Step 301, calculates private IP address number and public ip address number.
(1) private IP address number is calculated
Number of addresses p1=b1-a1+1 in address field 1
Number of addresses p2=b2-b2+1 in address field 2
����
Private address sum p=p1+p2+ ...
(2) public ip address number is calculated
Number of addresses q1=B1-A1+1 in address field 1
Number of addresses q2=B2-A2+1 in address field 2
����
Publicly-owned address sum q=q1+q2+ ...
Step 302, calculates publicly-owned address reusability.
M=int ((n2-n1+1)/n); Wherein int represents downward rounding operation.
Step 303, calculates the publicly-owned number of addresses needed.
Calculate all addresses in private pool according to reusability and map the publicly-owned number of addresses needed
Q0=int ((p-1)/m)+1;
Step 304, it is determined that the private address section at private IP address a place and the position in address field.
The relatively size of a and b1, if a��b1, then a belongs to the 1st address field; Otherwise,
The relatively size of a and b2, if a��b2, then a belongs to the 2nd address field; Otherwise,
����
The relatively size of a and bi, if a��bi, then a belongs to the i-th address field.
Determine a position in private address section
A is the jth address of i-th address field: j=a-ai+1.
Step 305, it is determined that the publicly-owned address field at A place and the position in publicly-owned address field.
A being ordered as in private pool:
P=a-ai+1, as i=1
P=p1+p2+ ...+pi-1+ (a-ai+1), as i > 1 time
A being ordered as in publicly-owned address pool: Q=int ((P-1)/m)+1
The relatively size of Q and q1, if Q��q1, then A belongs to the 1st address field; Otherwise,
The relatively size of Q and q1+q2, if Q��q1+q2, then A belongs to the 2nd address field; Otherwise,
����
Relatively Q and q1+q2+ ... the size of+qs, if Q��q1+q2+ ...+qs, then A belongs to s address field.
Determine A position in publicly-owned address field:
A is the t address of s address field:
T=Q, as s=1
T=Q-(q1+q2+ ...+qs-1), as s > 1 time
Step 306, it is determined that the publicly-owned address that private address a maps
Publicly-owned address A after mapping is: A=As+t-1
As s=1,
A=A1+int ((a-a1)/m) works as i=1
A=A1+int ((p1+p2+ ...+pi-1+ (a-ai))/m) works as i > 1
As s > 1 time,
A=As+int ((a-a1)/m)-(q1+q2+ ...+qs-1) is as i=1
A=As+int ((p1+p2+ ...+pi-1+ (a-ai))/m)-(q1+q2+ ...+qs-1)
As i > 1 time
Step 307, it is determined that the port block that private address a maps
The port block that private address a maps is: [u, v]
The port block that a maps can distribute being ordered as in port: R=(P-1) modm+1;Wherein mod represents complementation computing.
U=n1+ (R-1) * n
V=n1-1+R*n
To the address in private ip v4 address pool, proceed by the step 304 operation to step 307 from a1, till all address searching in private pool, form the mapping table with q item mapping relations.
According to one embodiment of present invention, network address translation apparatus is according to predetermined way (such as, address provided by the invention mapping mode) generate private IP address and the fixing mapping relations table of public ip address, port block, authenticating device generates mapping relations table in the same fashion, ensure that between conversion equipment and Verification System, the synchronization of mapping relations table is with consistent, eliminate the interaction between network address translation apparatus and Verification System.
Fig. 4 illustrates the structure chart of an embodiment of the IP address converting device of the present invention. As shown in Figure 4, this device includes address sort module 41, reusability acquisition module 42 and address mapping module 43. Wherein, the IP address in private IP address pond and public ip address pond is ranked up by address sort module 41 respectively; Reusability acquisition module 42 obtains publicly-owned address reusability according to port range and port block size; Such as, reusability acquisition module passes through formula: m=int ((n2-n1+1)/n) obtains publicly-owned address reusability; Wherein, int represents downward rounding operation, and (n1, n2) represents port range, and n is port block size. Address mapping module 43 determines the public ip address to distribute position in public ip address pond according to private IP address position in private IP address pond and publicly-owned address reusability, so that it is determined that the public ip address to distribute. According to one embodiment of present invention, this device also includes port and determines module 44, for determining, according to private IP address position in private IP address pond and publicly-owned address reusability, the port block that described private address maps.
Fig. 5 illustrates the structure chart of another embodiment of the IP address converting device of the present invention. As it is shown in figure 5, this device includes address sort module 41, reusability acquisition module 42, address mapping module 53 and port determines module 44. Wherein, address mapping module 53 includes private address position determination unit 531, publicly-owned address position determination module 532 and publicly-owned address determination unit 533. Private address position determination unit 531 determines private IP address sequence P in private IP address pond; Publicly-owned address position determination unit 532 determines the public ip address to distribute sequence Q=int ((P-1)/m)+1 in public ip address pond according to sequence P and publicly-owned address reusability m; Publicly-owned address determination unit 533 determines the public ip address to distribute position in public ip address pond according to the public ip address to distribute sequence Q in public ip address pond, so that it is determined that the public ip address to distribute.
The core of this method is to take arbitrary address a from the private pool of configuration, is mapped to the address A in publicly-owned address pool, distributes corresponding port block [u, v] simultaneously:
A--> (A, [u, v])
Fig. 6 illustrates the example that the private IP address according to the present invention maps to public ip address. When private ip v4 address pool only one of which address field, publicly-owned IPv4 address pool only one of which address field, as shown in Figure 6, then mapping address and port block are:
A=A1+int ((a-a1)/m)
U=n1+ (R-1) * n
V=n1-1+R*n] wherein R=(a-a1) modm+1.
Fig. 7 illustrates another example that the private IP address according to the present invention maps to public ip address. When private ip v4 address pool only one of which address field, publicly-owned IPv4 address pool have multiple address field, as it is shown in fig. 7, then mapping address and port block are:
A=As+int ((a-a1)/m)-(q1+q2+ ...+qs-1)
U=n1+ (R-1) * n
V=n1-1+R*n]
Wherein R=(a-a1) modm+1, As are the initial addresses of the A address section determined according to step 11.
Fig. 8 illustrates another example that the private IP address according to the present invention maps to public ip address. When private ip v4 address pool has several address field, publicly-owned IPv4 address pool only one of which address field, as shown in Figure 8, then mapping address and port block are:
A=A1+int ((p1+p2+ ...+pi-1+ (a-ai))/m)
U=n1+ (R-1) * n
V=n1-1+R*n]
Wherein R=(p1+p2+ ...+pi-1+ (a-ai)) modm+1, ai are the initial addresses of a address section determined according to step 9.
Description of the invention provides for example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form. Many modifications and variations are obvious for the ordinary skill in the art. Selecting and describing embodiment is in order to principles of the invention and practical application are better described, and makes those of ordinary skill in the art it will be appreciated that the present invention is thus design is suitable to the various embodiments with various amendments of special-purpose.
Claims (11)
1. an IP address conversion method, it is characterised in that including:
IP address in private IP address pond and public ip address pond is ranked up respectively;
Publicly-owned address reusability is obtained according to port range and port block size;
The public ip address to distribute position in described public ip address pond is determined according to private IP address position in described private IP address pond and described publicly-owned address reusability, so that it is determined that the public ip address to distribute.
2. method according to claim 1, it is characterised in that also include:
The port block that described private address maps is determined according to described private IP address position in described private IP address pond and described publicly-owned address reusability.
3. method according to claim 1, it is characterised in that described obtain publicly-owned address reusability m according to port range and port block size particularly as follows:
M=int ((n2-n1+1)/n)
Wherein, int represents downward rounding operation, and (n1, n2) represents port range, and n1 is for starting port, and n2 is for terminating port, and n is port block size.
4. method according to claim 3, it is characterised in that described position according to private IP address in described private IP address pond and described publicly-owned address reusability determine that the public ip address to distribute position in described public ip address pond includes:
Determine described private IP address sequence P in described private IP address pond;
The public ip address to distribute sequence Q=int ((P-1)/m)+1 in described public ip address pond is determined according to described sequence P and described publicly-owned address reusability m;
The described public ip address to distribute position in described public ip address pond is determined according to the described public ip address to distribute sequence Q in described public ip address pond.
5. method as claimed in any of claims 1 to 4, it is characterised in that network address translation apparatus and Verification System adopt said method to generate mapping table so that network address translation apparatus keeps consistent with the address mapping table of Verification System.
6. an IP address converting device, it is characterised in that including:
Address sort module, for being ranked up respectively the IP address in private IP address pond and public ip address pond;
Reusability acquisition module, for obtaining publicly-owned address reusability according to port range and port block size;
Address mapping module, for determining the public ip address to distribute position in described public ip address pond according to private IP address position in described private IP address pond and described publicly-owned address reusability, so that it is determined that the public ip address to distribute.
7. device according to claim 6, it is characterised in that also include:
Port determines module, for determining, according to described private IP address position in described private IP address pond and described publicly-owned address reusability, the port block that described private address maps.
8. device according to claim 6, it is characterised in that described reusability acquisition module obtain publicly-owned address reusability m according to port range and port block size particularly as follows:
M=int ((n2-n1+1)/n)
Wherein, int represents downward rounding operation, and (n1, n2) represents port range, and n1 is for starting port, and n2 is for terminating port, and n is port block size.
9. device according to claim 6, it is characterised in that described address mapping module includes:
Private address position determination unit, for determining described private IP address sequence P in described private IP address pond;
Publicly-owned address position determination unit, for determining the public ip address to distribute sequence Q=int ((P-1)/m)+1 in described public ip address pond according to described sequence P and described publicly-owned address reusability m;
Publicly-owned address determination unit, for determining the described public ip address to distribute position in described public ip address pond according to the described public ip address to distribute sequence Q in described public ip address pond, so that it is determined that the public ip address to distribute.
10. a network address translation apparatus, it is characterised in that include the IP address converting device described in any one in claim 6 to 9.
11. a Verification System, it is characterised in that include the IP address converting device described in any one in claim 6 to 9.
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| CN104427013B (en) * | 2013-09-10 | 2018-06-12 | 中国电信股份有限公司 | Working level address-translating device and its processing method to station address mapping relations |
| CN111343291B (en) * | 2018-12-19 | 2022-04-26 | 中国电信股份有限公司 | Service acceleration processing method and device, QoS platform and storage medium |
| CN114095471A (en) * | 2020-07-29 | 2022-02-25 | 中国电信股份有限公司 | Address translation method and device and address tracing method and device |
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| CN1567907A (en) * | 2003-06-14 | 2005-01-19 | 华为技术有限公司 | A method for utilizing network address resource |
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