Control device, control method, and program
A control device is connected to a plurality of networks, dispatches a packet received from a user terminal to a network among the plurality of networks, and includes a memory and a processor configured to execute receiving a DNS query packet transmitted from the user terminal, and based on a query target of the DNS query packet, dispatching the DNS query packet to a network among the plurality of networks; and receiving a packet, determining a destination of the packet based on a destination address of the packet, and transmitting the packet to the determined destination.
1. A control device that is connected to a plurality of networks, and dispatches a packet received from a user terminal to a network among the plurality of networks, the control device comprising:
a memory; and
a processor configured to execute
receiving a DNS query packet transmitted from the user terminal, and based on a query target of the DNS query packet and a DNS dispatch policy management database, dispatching the DNS query packet to a DNS server connected to a network among the plurality of networks; and
receiving a packet, determining a destination of the packet based on a destination address of the packet and an application routing policy management database, and transmitting the packet to the determined destination.
2. The control device as claimed in claim 1 ,
wherein the memory further includes an application management database configured to manage information on an application; and
wherein the processor is further configured to execute updating the application management database, by periodically accessing an external application management server.
3. A control device that is connected to a plurality of networks, and dispatches a packet received from a user terminal to a network among the plurality of networks, the control device comprising:
a memory; and
a processor configured to execute
receiving a DNS query packet transmitted from the user terminal, and based on a query target of the DNS query packet, dispatching the DNS query packet to a network among the plurality of networks; and
receiving a packet, determining a destination of the packet based on a destination address of the packet, and transmitting the packet to the determined destination,
wherein the memory includes an application table configured to store information for associating a destination address of a packet with an application of the destination of the packet,
wherein the receiving of the packet refers to the application table to recognize an application corresponding to a destination address of a received packet, and dispatches the received packet to a network among the plurality of networks according to a policy specified in advance with respect to the application.
4. The control device as claimed in claim 3 , wherein the receiving of the packet updates the application table by using the query target of the DNS query packet and an address received as a response to a query.
5. The control device as claimed in claim 3 , wherein the application table has a timer value for each record, and a record for which a period corresponding to the timer value has elapsed is deleted.
6. The control device as claimed in claim 3 , wherein the receiving of the DNS query packet rewrites the destination address of the DNS query packet in accordance with a dispatch destination of the DNS query packet.
7. The control device as claimed in claim 3 , wherein the control device is connected to a predetermined proxy device, and the processor is further configured to execute determining whether to transmit a received packet to the proxy device, based on an application as an access destination of the received packet.
8. The control device as claimed in claim 7 , wherein the memory further includes a proxy dispatch table configured to record a destination address and an operation for each application, and by referring to the proxy dispatch table, the determining determines whether to transmit a packet to the proxy device, and updates the proxy dispatch table by using the application table.
9. A control method executed by a control device that is connected to a plurality of networks, dispatches a packet received from a user terminal to a network among the plurality of networks, and includes a memory and a processor, the control method comprising:
receiving a DNS query packet transmitted from the user terminal, and based on a query target of the DNS query packet and a DNS dispatch policy management database, dispatching the DNS query packet to a DNS server connected to a network among the plurality of networks; and
receiving a packet, determining a destination of the packet based on a destination address of the packet and an application routing policy management database, and transmitting the packet to the determined destination.
10. A non-transitory computer-readable recording medium having computer-readable instructions stored thereon, which when executed, causes a computer to execute a control method on the computer that is connected to a plurality of networks, and dispatches a packet received from a user terminal to a network among the plurality of networks, the control method comprising:
receiving a DNS query packet transmitted from the user terminal, and based on a query target of the DNS query packet and a DNS dispatch policy management database, dispatching the DNS query packet to a DNS server connected to a network among the plurality of networks; and
receiving a packet, determining a destination of the packet based on a destination address of the packet and an application routing policy management database, and transmitting the packet to the determined destination.