JP2004072291A5

JP2004072291A5 -

Info

Publication number: JP2004072291A5
Application number: JP2002226960A
Authority: JP
Filing date: 2002-08-05
Publication date: 2005-10-27
Anticipated expiration: 2022-08-05

Claims

An address translation apparatus for connecting a first network and a second network, wherein a second port number of the second network exchanged in a protocol higher than a transport layer is assigned to a second port number of the first network. An address translation device characterized in that it is replaced with a port number of 1.

2. The address translation apparatus according to claim 1, wherein the first port number is acquired and assigned in response to a port assignment request in the protocol.

An address translation device for connecting a first network and a second network,
Packet analysis means for extracting a second port number of the second network exchanged in a protocol higher than a transport layer from a packet of the second network;
An address translation device comprising: communication means for generating a packet to the first network by replacing the second port number with the first port number of the first network.

4. The address translation apparatus according to claim 3, further comprising port assignment processing means for acquiring and assigning the first port number in response to a port assignment request from the first network.

The port assignment processing means includes:
Setting port search means for searching for the first port number already set in the address conversion table;
Control means for obtaining a first port number according to the number of ports in the allocation request from among the first port numbers confirmed not to be set by the set port search means. Item 11. The address translation device according to Item 10.

The port assignment processing means includes:
Setting port search means for searching for the first port number already set in the address conversion table;
In-use port search means for searching for the first port number already used in the port status table;
The first port according to the number of ports in the allocation request from among the first port numbers confirmed not to be set by the set port search means and confirmed not to be used by the busy port search means 11. The address translation apparatus according to claim 10, further comprising a control unit that obtains a number.

The allocation request includes the presence or absence of designation of the start number of the first port number to be allocated,
13. The control unit according to claim 12, wherein when the start number is not specified, a port initial value is generated by a random number, and the first port number is obtained using the port initial value as a start number. Address translation device.

The allocation request includes designation of a start number of a first port number to be allocated;
13. The address translation apparatus according to claim 12, wherein the control unit obtains a first port number from a start number included in the allocation request.

The port assignment processing means includes:
A port definition file that holds a minimum value and a maximum value of the first port number to be acquired;
13. The address conversion apparatus according to claim 12, wherein the control unit acquires the first port number in the range from the minimum value to the maximum value in the port definition file.

The allocation request includes designation of a start number of a first port number to be allocated;
The control means determines whether or not a start number included in the allocation request is within a range from the minimum value to the maximum value. If the start number is within the range from the minimum value to the maximum value, the control unit starts from the start number. 16. The address translation apparatus according to claim 15, wherein a port number of 1 is acquired and a start number designation error is notified if the port number is not within the range from the minimum value to the maximum value.

The allocation request includes a designation as to whether or not the first port number to be allocated is limited to a serial number;
The control means, if the allocation request includes a designation that the allocation number is limited to the serial number, if the serial number cannot be acquired as the first port number, the acquisition unit fails to acquire, and the allocation request is limited to the serial number. 13. The address conversion apparatus according to claim 12, wherein if the designation is not included, the non-consecutive number is obtained if the consecutive number cannot be obtained.

Proxy storage means for holding a copy of a storage area of a server connected to the second network;
The server further comprises server proxy means for obtaining a second port number according to the number of ports in the allocation request with reference to the proxy storage means and generating a packet of the second network. 3. The address translation device according to 3.

19. The address translation device according to claim 18, further comprising port assignment processing means for receiving and assigning the first port number in response to an assignment request for the first port number from the first network. .

Extracting a second port number of a second network exchanged in a protocol higher than the transport layer from the packet of the second network;
And a procedure for generating a packet to the first network by replacing the second port number with the first port number of the first network.