CN102932490A - Internet protocol (IP) address translation method and device, network address translation equipment and authentication system - Google Patents
Internet protocol (IP) address translation method and device, network address translation equipment and authentication system Download PDFInfo
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Abstract
The invention discloses an internet protocol (IP) address translation method, an internet protocol (IP) address translation device, network address translation equipment and an authentication system, and relates to the technical field of IP networks. The method comprises the following steps of: respectively sorting IP addresses in a private IP address pool and a public IP address pool; acquiring public address multiplex ratio according to a port range and the size of a port block; and determining the position of a public IP address to be allocated in the public IP address pool according to the position of a private IP address in the private IP address pool and the public address multiplex ratio, and thus determining the public IP address to be allocated and the corresponding port block. According to the invention, a fixed mapping idea is provided, and a quick address mapping method and a quick address mapping device are provided, so the mapping table generating speed of the equipment or the system is greatly increased, and the interaction process of the network address translation equipment and the authentication system is eliminated. The invention has the advantages of operability and practicability.
Description
Technical field
The present invention relates to the IP network technical field, relate in particular to IP address conversion method, device, network address translation apparatus and Verification System.
Background technology
Along with publicly-owned IPv4 address is about to exhaustedly, the application of private ip v4 address will be more and more extensive gradually, and that the deployment of network address translation apparatus also can become is more and more general.When the user uses the private IP address online, network address translation apparatus can convert user's private address to public ip address, and the application of using according to the user distributes corresponding port, conversion equipment can generate the mapping relations list item of a private IP address and public ip address, port, the mapping relations table of storage private IP address and public ip address, port in network address translation apparatus.
When the user surfs the Net, usually network address translation apparatus distributes an address randomly according to user's private IP address from the public ip address pond, port of Random assignment again, form the mapping relations of private IP address and public ip address, port, the mapping relations that this mode generates need to be informed Verification System in real time, in order to retain identical mapping relations in Verification System.
In network address translation apparatus, how the mapping relations table of private IP address and public ip address, port generates, and how the mapping relations in Verification System keep consistent with network address translation apparatus is very crucial technical problem.
Summary of the invention
The technical problem that the present invention will solve is to provide a kind of fast address mapping method and device.
According to an aspect of the present invention, provide a kind of IP address conversion method, comprising: sorted respectively in private IP address pond and Zhong DeIP address, public ip address pond; Obtain publicly-owned address reusability according to port range and port block size; According to private IP address in Zhong De position, described private IP address pond and described publicly-owned address reusability determine that the public ip address that will distribute is in Zhong De position, described public ip address pond, thereby determine the public ip address that will distribute.
Preferably, the method also comprises: determine the port piece of described private address mapping in Zhong De position, described private IP address pond and described publicly-owned address reusability according to described private IP address.
Preferably, describedly obtain publicly-owned address reusability m according to port range and port block size and be specially:
m＝int((n2-n1+1)/n)
Wherein, int means downward rounding operation, and (n1, n2) means port range, and n is the port block size.
Preferably, described according to private IP address in Zhong De position, described private IP address pond and described publicly-owned address reusability determine that the public ip address that will distribute comprises in Zhong De position, described public ip address pond: determine the sequence P of described private IP address in described private IP address pond; Determine the sequence Q=int ((P-1)/m)+1 of public ip address in described public ip address pond that will distribute according to described sequence P and described publicly-owned address reusability m; Sequence Q according to the described public ip address that will distribute in described public ip address pond determines that the described public ip address that will distribute is in Zhong De position, described public ip address pond.
Preferably, network address translation apparatus and Verification System adopt said method to generate mapping table, make the address mapping table of network address translation apparatus and Verification System be consistent.
According to a further aspect in the invention, provide a kind of IP address converting device, comprising: the address sort module, for being sorted respectively in private IP address pond and Zhong DeIP address, public ip address pond; The reusability acquisition module, for obtaining publicly-owned address reusability according to port range and port block size; Address mapping module, for according to private IP address in Zhong De position, described private IP address pond and described publicly-owned address reusability determine that the public ip address that will distribute is in Zhong De position, described public ip address pond, thereby determine the public ip address that will distribute.
Preferably, this device also comprises: the port determination module, and for determine the port piece of described private address mapping in Zhong De position, described private IP address pond and described publicly-owned address reusability according to described private IP address.
Preferably, described reusability acquisition module obtains publicly-owned address reusability m according to port range and port block size and is specially:
m＝int((n2-n1+1)/n)
Wherein, int means downward rounding operation, and (n1, n2) means port range, and n is the port block size.
Preferably, described address mapping module comprises: the private address position determination unit, for determining the sequence P of described private IP address in described private IP address pond; Publicly-owned address position determination unit, for determining that according to described sequence P and described publicly-owned address reusability m the public ip address that will distribute is at the sequence Q=int in described public ip address pond ((P-1)/m)+1; Publicly-owned address determining unit, for the sequence Q in described public ip address pond determines that the described public ip address that will distribute is in Zhong De position, described public ip address pond according to the described public ip address that will distribute, thereby determine the public ip address that will distribute.
According to another aspect of the invention, also provide network address translation apparatus and the Verification System that comprises the above-mentioned IP address converting device.
IP address conversion method provided by the invention and device, the parameters such as private IP address pond, public ip address pond, port range and port block size according to configuration, calculate as requested public ip address corresponding to private IP address and port piece, realize the quick mapping method between private IP address and public ip address, greatly improved the speed that equipment or system generate mapping table.
The accompanying drawing explanation
Fig. 1 illustrates the flow chart of an embodiment of IP address conversion method of the present invention;
Fig. 2 illustrates the schematic diagram that IP address conversion method according to the present invention carries out private IP address and the fixing mapping of public ip address;
Fig. 3 illustrates the flow chart of another embodiment of IP address conversion method of the present invention;
Fig. 4 illustrates the structure chart of an embodiment of IP address converting device of the present invention;
Fig. 5 illustrates the structure chart of another embodiment of IP address converting device of the present invention;
Fig. 6 illustrates the example of private IP address according to the present invention to the public ip address mapping;
Fig. 7 illustrates private IP address according to the present invention another example to the public ip address mapping;
Fig. 8 illustrates private IP address according to the present invention another example to the public ip address mapping.
Embodiment
With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention wherein is described.
Fig. 1 illustrates the flow chart of an embodiment of IP address conversion method of the present invention.
As shown in Figure 1, step 102, sorted to private IP address pond and Zhong DeIP address, public ip address pond respectively.
m＝int((n2-n1+1)/n)
Wherein, int means downward rounding operation, and (n1, n2) means port range, and n is the port block size.
According to one embodiment of present invention, also according to private IP address, in Zhong De position, private IP address pond and publicly-owned address reusability, determine the port piece of private address mapping.
In above-described embodiment, thought based on fixing mapping, the parameters such as private IP address pond, public ip address pond, port range and port block size according to configuration, calculate as requested public ip address corresponding to private IP address and port piece, realize the quick mapping method between private IP address and public ip address, greatly improved the speed that equipment or system generate mapping table.
Fig. 2 illustrates the schematic diagram that IP address conversion method according to the present invention carries out private IP address and the fixing mapping of public ip address.As shown in Figure 2, suppose for the arbitrary address a in the private IP address pond, it is mapped to Zhong De address, public ip address pond A, distributes corresponding port piece [u, v] simultaneously:
a——＞(A，[u，v])
Configuration private IP address pond, address pool can be comprised of 1 or a plurality of private IP address section, for example the size according to the IP address is sorted from small to large to address field: (a1, b1), (a2, b2) ... wherein a, b mean beginning, the end address of each address field, can adopt binary system, hexadecimal or decimal representation.
Configuration public ip address pond, address pool can be comprised of one or more discontinuous public ip address sections, according to address size, address field is sorted from small to large: (A1, B1), (A2, B2) ... .. wherein A, B means beginning, the end address of each address field can adopt binary system, hexadecimal or the decimal system.
Configured port block size n.N is the publicly-owned address port block size of distributing to the user after mapping, and it is 4096 that the default port block size can be set as required.
Configured port scope (n1, n2).Sign can be for the port range of mapping, and n1, n2 mean respectively to start port and finish port.
Fig. 3 illustrates the flow chart of another embodiment of IP address conversion method of the present invention.As shown in Figure 3, the specific implementation flow process of this embodiment is as follows:
(1) calculate the private IP address number
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) calculate the public ip address number
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+......
M=int ((n2-n1+1)/n); Wherein int means downward rounding operation.If m = 0, the error message generated ：Unreasonable?port?range！
Calculate according to reusability the publicly-owned number of addresses that in private pool, the mapping of all addresses needs
q0＝int((p-1)/m)+1；
If q0> q, generate an error message：Not?enough?public?addresses！
Compare the size of a and b1, if a<=b1, a belongs to the 1st address field; Otherwise,
Compare the size of a and b2, if a<=b2, a belongs to the 2nd address field; Otherwise,
......
Compare the size of a and b i, if a<=b i, a belongs to the i address field.
Determine the position of a in the private address section
A is j address of i address field: j=a-a i+1.
The sequence of a in private pool is:
P=a-a i+1, when i=1
P=p1+p2+......+pi-1+ (a-a i+1), when i>1
The sequence of A in publicly-owned address pool is: Q=int ((P-1)/m)+1
Compare the size of Q and q1, if Q<=q1, A belongs to the 1st address field; Otherwise,
Compare the size of Q and q1+q2, if Q<=q1+q2, A belongs to the 2nd address field; Otherwise,
......
Compare the size of Q and q1+q2+...+qs, if Q<=q1+q2+...+qs, A belongs to the s address field.
Determine the position of A in publicly-owned address field:
A is t address of s address field:
T=Q, when s=1
T=Q-(q1+q2+...+qs-1), when s>1
Publicly-owned address A after mapping is: A=As+t-1
When s=1,
A=A1+int ((a-a1)/m) works as i=1
A=A1+int ((p1+p2+......+pi-1+ (a-a i))/m) is when i>1
When s>1,
A=As+int ((a-a1)/m)-(q1+q2+...+qs-1) is when i=1
A＝As+int((p1+p2+......+pi-1+(a-a?i))/m)-(q1+q2+...+qs-1)
When i>1
The port piece of private address a mapping is: [u, v]
The sequence of port piece in can distributing port of a mapping is: R=(P-1) mod m+1; Wherein mod means the complementation computing.
u＝n1+(R-1)*n
v＝n1-1+R*n
To the address in private ip v4 address pool, start to carry out the operation of step 304 to step 307 from a1, until all addresses traversal in private pool forms the mapping table with q item mapping relations.
According to one embodiment of present invention, network address translation apparatus according to predetermined way (for example, address provided by the invention mapping mode) generate the fixedly mapping relations table of private IP address and public ip address, port piece, authenticating device generates the mapping relations table according to identical mode, guarantee the synchronous with consistent of mapping relations table between conversion equipment and Verification System, eliminated the reciprocal process between network address translation apparatus and Verification System.
Fig. 4 illustrates the structure chart of an embodiment of IP address converting device of the present invention.As shown in Figure 4, this device comprises address sort module 41, reusability acquisition module 42 and address mapping module 43.Wherein, sorted respectively in 41 pairs of private IP address ponds of address sort module and Zhong DeIP address, public ip address pond; Reusability acquisition module 42 obtains publicly-owned address reusability according to port range and port block size; For example, the reusability acquisition module passes through formula: m=int ((n2-n1+1)/n) obtains publicly-owned address reusability; Wherein, int means downward rounding operation, and (n1, n2) means port range, and n is the port block size.Address mapping module 43 according to private IP address in Zhong De position, private IP address pond and publicly-owned address reusability determine that the public ip address that will distribute is in Zhong De position, public ip address pond, thereby determine the public ip address that will distribute.According to one embodiment of present invention, this device also comprises port determination module 44, for determine the port piece of described private address mapping in Zhong De position, private IP address pond and publicly-owned address reusability according to private IP address.
Fig. 5 illustrates the structure chart of another embodiment of IP address converting device of the present invention.As shown in Figure 5, this device comprises address sort module 41, reusability acquisition module 42, address mapping module 53 and port determination module 44.Wherein, address mapping module 53 comprises private address position determination unit 531, publicly-owned address position determination module 532 and publicly-owned address determining unit 533.Private address position determination unit 531 is determined the sequence P of private IP address in the private IP address pond; Publicly-owned address position determination unit 532 is determined the sequence Q=int ((P-1)/m)+1 of public ip address in the public ip address pond that will distribute according to sequence P and publicly-owned address reusability m; Publicly-owned address determining unit 533 determines that according to the sequence Q of public ip address in the public ip address pond that will distribute the public ip address that will distribute is in Zhong De position, public ip address pond, thereby determines the public ip address that will distribute.
The core of this method is to get arbitrary address a from the private pool of configuration, is mapped to the address A in publicly-owned address pool, distributes corresponding port piece [u, v] simultaneously:
a——＞(A，[u，v])
Fig. 6 illustrates the example of private IP address according to the present invention to the public ip address mapping.For private ip v4 address pool, only have an address field, publicly-owned IPv4 address pool to only have the situation of an address field, as shown in Figure 6, mapping address and port piece are:
A＝A1+int((a-a1)/m)
u＝n1+(R-1)*n
V=n1-1+R*n] R=(a-a1) mod m+1 wherein.
Fig. 7 illustrates private IP address according to the present invention another example to the public ip address mapping.For private ip v4 address pool, only have an address field, publicly-owned IPv4 address pool that the situation of a plurality of address fields is arranged, as shown in Figure 7, mapping address and port piece are:
A＝As+int((a-a1)/m)-(q1+q2+...+qs-1)
u＝n1+(R-1)*n
v＝n1-1+R*n]
R=(a-a1) mod m+1 wherein, As is the initial address of the A address section definite according to step 11.
Fig. 8 illustrates private IP address according to the present invention another example to the public ip address mapping.For private ip v4 address pool, have several address fields, publicly-owned IPv4 address pool to only have the situation of an address field, as shown in Figure 8, mapping address and port piece are:
A＝A1+int((p1+p2+......+pi-1+(a-a?i))/m)
u＝n1+(R-1)*n
v＝n1-1+R*n]
R=(p1+p2+......+pi-1+ (a-a i)) mod m+1 wherein, a i is the initial address of a address section definite 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 for better explanation principle of the present invention and practical application, thereby and makes those of ordinary skill in the art can understand the various embodiment with various modifications that the present invention's design is suitable for special-purpose.
Claims (11)
1. an IP address conversion method, is characterized in that, comprising:
Sorted respectively in private IP address pond and Zhong DeIP address, public ip address pond;
Obtain publicly-owned address reusability according to port range and port block size;
According to private IP address in Zhong De position, described private IP address pond and described publicly-owned address reusability determine that the public ip address that will distribute is in Zhong De position, described public ip address pond, thereby determine the public ip address that will distribute.
2. method according to claim 1, is characterized in that, also comprises:
Determine the port piece of described private address mapping in Zhong De position, described private IP address pond and described publicly-owned address reusability according to described private IP address.
3. method according to claim 1, is characterized in that, describedly obtains publicly-owned address reusability m according to port range and port block size and be specially:
m＝int((n2-n1+1)/n)
Wherein, int means downward rounding operation, and (n1, n2) means port range, and n is the port block size.
4. method according to claim 3, is characterized in that, described according to private IP address in Zhong De position, described private IP address pond and described publicly-owned address reusability determine that the public ip address that will distribute comprises in Zhong De position, described public ip address pond:
Determine the sequence P of described private IP address in described private IP address pond;
Determine the sequence Q=int ((P-1)/m)+1 of public ip address in described public ip address pond that will distribute according to described sequence P and described publicly-owned address reusability m;
Sequence Q according to the described public ip address that will distribute in described public ip address pond determines that the described public ip address that will distribute is in Zhong De position, described public ip address pond.
5. according to the described method of any one in claim 1 to 4, it is characterized in that, network address translation apparatus and Verification System adopt said method to generate mapping table, make the address mapping table of network address translation apparatus and Verification System be consistent.
6. an IP address converting device, is characterized in that, comprising:
The address sort module, for being sorted respectively to private IP address pond and Zhong DeIP address, public ip address pond;
The reusability acquisition module, for obtaining publicly-owned address reusability according to port range and port block size;
Address mapping module, for according to private IP address in Zhong De position, described private IP address pond and described publicly-owned address reusability determine that the public ip address that will distribute is in Zhong De position, described public ip address pond, thereby determine the public ip address that will distribute.
7. device according to claim 6, is characterized in that, also comprises:
The port determination module, for determining the port piece of described private address mapping in Zhong De position, described private IP address pond and described publicly-owned address reusability according to described private IP address.
8. device according to claim 6, is characterized in that, described reusability acquisition module obtains publicly-owned address reusability m according to port range and port block size and is specially:
m＝int((n2-n1+1)/n)
Wherein, int means downward rounding operation, and (n1, n2) means port range, and n is the port block size.
9. device according to claim 6, is characterized in that, described address mapping module comprises:
The private address position determination unit, for determining the sequence P of described private IP address in described private IP address pond;
Publicly-owned address position determination unit, for determining that according to described sequence P and described publicly-owned address reusability m the public ip address that will distribute is at the sequence Q=int in described public ip address pond ((P-1)/m)+1;
Publicly-owned address determining unit, for the sequence Q in described public ip address pond determines that the described public ip address that will distribute is in Zhong De position, described public ip address pond according to the described public ip address that will distribute, thereby determine the public ip address that will distribute.
10. a network address translation apparatus, is characterized in that, comprises the described IP address converting device of any one in claim 6 to 9.
11. a Verification System, is characterized in that, comprises the described IP address converting device of any one in claim 6 to 9.
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| CN111343291A (en) * | 2018-12-19 | 2020-06-26 | 中国电信股份有限公司 | Service acceleration processing method and device, QoS platform and storage medium |
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