Device, method and program for protocol translation

• US 20020174233A1
• Filed: 05/15/2002
• Published: 11/21/2002
• Est. Priority Date: 05/16/2001
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Murakami, Takuya
• Granted Patent: US 7,203,757 B2
• Time in Patent Office: Days
• US Class Current: 709/227
• CPC Class Codes: H04L 69/08 Protocols for interworking; Protocol conversion
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

A protocol translation device realizes the merit of communications via the T/TCP protocol even if only one of devices in communication is compatible with T/TCP. The protocol translation device conducts protocol translation to relay communication packets sent and received between a TCP channel and a T/TCP channel, including a means for translating a T/TCP packet into a TCP packet by deleting a CC option and a CCnew option from the T/TCP packet, a means for translating a TCP packet into a T/TCP packet by adding CC, CCnew and/or CCecho options to the TCP packet and setting a CC value, and a means for assigning a value that is 16 bytes less than the maximum size of the packet to an MSS option for a communication device that communicates by the TCP protocol and instructing the communication device to transmit data with a packet that is 16 bytes or more smaller than the maximum size of the packet.

Claims

1. A protocol translation device, which conducts protocol translation to relay communication packets sent and received between a TCP channel and a T/TCP channel, including a means for translating the TCP protocol into the T/TCP protocol or the T/TCP protocol into the TCP protocol to transmit the packets.

2. The protocol translation device claimed in claim 1, further including:

a means for translating a T/TCP packet into a TCP packet by deleting a CC option and a CCnew option from the T/TCP packet; and

a means for translating a TCP packet into a T/TCP packet by adding CC, CCnew and/or CCecho options to the TCP packet and setting a CC value.

3. The protocol translation device claimed in claim 2, which assigns a value that is 16 bytes less than the maximum size of the packet to an MSS option for a communication device that communicates by the TCP protocol, and instructs the communication device to transmit data with a packet that is 16 bytes or more smaller than the maximum size of the packet.

4. The protocol translation device claimed in claim 1, which computes a check sum value included in a header of a packet to compensate the value when translating the packet and updates the check sum value.

5. The protocol translation device claimed in claim 2, which computes a check sum value included in a header of a packet to compensate the value when translating the packet and updates the check sum value.

6. The protocol translation device claimed in claim 3, which computes a check sum value included in a header of a packet to compensate the value when translating the packet and updates the check sum value.

7. The protocol translation device claimed in claim 1, further including:

a means for uniquely identifying devices that send and receive packets in reference to the address of the respective devices and a port number; and

a means for recording a setting to specify whether or not protocol translation is necessary and a setting to specify a type of translation when protocol translation is necessary;

wherein

the protocol translation device conducts protocol translation to relay the packets based on the protocol translation settings of the devices at sending end and receiving end.

8. The protocol translation device claimed in claim 2, further including:

a means for uniquely identifying devices that send and receive packets in reference to the address of the respective devices and a port number; and

a means for recording a setting to specify whether or not protocol translation is necessary and a setting to specify a type of translation when protocol translation is necessary;

wherein

the protocol translation device conducts protocol translation to relay the packets based on the protocol translation settings of the devices at sending end and receiving end.

9. The protocol translation device claimed in claim 3, further including:

a means for uniquely identifying devices that send and receive packets in reference to the address of the respective devices and a port number; and

a means for recording a setting to specify whether or not protocol translation is necessary and a setting to specify a type of translation when protocol translation is necessary;

wherein

the protocol translation device conducts protocol translation to relay the packets based on the protocol translation settings of the devices at sending end and receiving end.

10. The protocol translation device claimed in claim 4, further including:

a means for uniquely identifying devices that send and receive packets in reference to the address of the respective devices and a port number; and

a means for recording a setting to specify whether or not protocol translation is necessary and a setting to specify a type of translation when protocol translation is necessary;

wherein

the protocol translation device conducts protocol translation to relay the packets based on the protocol translation settings of the devices at sending end and receiving end.

11. The protocol translation device claimed in claim 1, further including a means for automatically detecting whether the protocol applied to a communication channel is the T/TCP protocol or the TCP protocol, and establishing communication by the detected protocol.

12. The protocol translation device claimed in claim 2, further including a means for automatically detecting whether the protocol applied to a communication channel is the T/TCP protocol or the TCP protocol, and establishing communication by the detected protocol.

13. The protocol translation device claimed in claim 3, further including a means for automatically detecting whether the protocol applied to a communication channel is the T/TCP protocol or the TCP protocol, and establishing communication by the detected protocol.

14. The protocol translation device claimed in claim 4, further including a means for automatically detecting whether the protocol applied to a communication channel is the T/TCP protocol or the TCP protocol, and establishing communication by the detected protocol.

15. The protocol translation device claimed in claim 7, further including a means for automatically detecting whether the protocol applied to a communication channel is the T/TCP protocol or the TCP protocol, and establishing communication by the detected protocol.

16. The protocol translation device claimed in claim 1, which has a built-in NAT capability, and updates the CC value included in the CC, CCnew and/or CCecho options of the received T/TCP packet to a CC value generated by the translation device itself.

17. The protocol translation device claimed in claim 2, which has a built-in NAT capability, and updates the CC value included in the CC, CCnew and/or CCecho options of the received T/TCP packet to a CC value generated by the translation device itself.

18. The protocol translation device claimed in claim 3, which has a built-in NAT capability, and updates the CC value included in the CC, CCnew and/or CCecho options of the received T/TCP packet to a CC value generated by the translation device itself.

19. The protocol translation device claimed in claim 4, which has a built-in NAT capability, and updates the CC value included in the CC, CCnew and/or CCecho options of the received T/TCP packet to a CC value generated by the translation device itself.

20. The protocol translation device claimed in claim 7, which has a built-in NAT capability, and updates the CC value included in the CC, CCnew and/or CCecho options of the received T/TCP packet to a CC value generated by the translation device itself.

21. The protocol translation device claimed in claim 11, which has a built-in NAT capability, and updates the CC value included in the CC, CCnew and/or CCecho options of the received T/TCP packet to a CC value generated by the translation device itself.

22. The protocol translation device claimed in claim 1, which relays transmissions between a client and a server.

23. The protocol translation device claimed in claim 2, which relays transmissions between a client and a server.

24. The protocol translation device claimed in claim 3, which relays transmissions between a client and a server.

25. The protocol translation device claimed in claim 4, which relays transmissions between a client and a server.

26. The protocol translation device claimed in claim 7, which relays transmissions between a client and a server.

27. The protocol translation device claimed in claim 11, which relays transmissions between a client and a server.

28. The protocol translation device claimed in claim 16, which relays transmissions between a client and a server.

29. The protocol translation device claimed in claim 1, which sends and receives packets via the T/TCP protocol on a channel to the client, sends and receives packets via the TCP protocol on a channel to the server, and relays transmissions between the client and the server by translating the T/TCP protocol and the TCP protocol.

30. The protocol translation device claimed in claim 2, which sends and receives packets via the T/TCP protocol on a channel to the client, sends and receives packets via the TCP protocol on a channel to the server, and relays transmissions between the client and the server by translating the T/TCP protocol and the TCP protocol.

31. The protocol translation device claimed in claim 3, which sends and receives packets via the T/TCP protocol on a channel to the client, sends and receives packets via the TCP protocol on a channel to the server, and relays transmissions between the client and the server by translating the T/TCP protocol and the TCP protocol.

32. The protocol translation device claimed in claim 4, which sends and receives packets via the T/TCP protocol on a channel to the client, sends and receives packets via the TCP protocol on a channel to the server, and relays transmissions between the client and the server by translating the T/TCP protocol and the TCP protocol.

33. The protocol translation device claimed in claim 7, which sends and receives packets via the T/TCP protocol on a channel to the client, sends and receives packets via the TCP protocol on a channel to the server, and relays transmissions between the client and the server by translating the T/TCP protocol and the TCP protocol.

34. The protocol translation device claimed in claim 11, which sends and receives packets via the T/TCP protocol on a channel to the client, sends and receives packets via the TCP protocol on a channel to the server, and relays transmissions between the client and the server by translating the T/TCP protocol and the TCP protocol.

35. The protocol translation device claimed in claim 16, which sends and receives packets via the T/TCP protocol on a channel to the client, sends and receives packets via the TCP protocol on a channel to the server, and relays transmissions between the client and the server by translating the T/TCP protocol and the TCP protocol.

36. The protocol translation device claimed in claim 22, which sends and receives packets via the T/TCP protocol on a channel to the client, sends and receives packets via the TCP protocol on a channel to the server, and relays transmissions between the client and the server by translating the T/TCP protocol and the TCP protocol.

38. The protocol translation method claimed in claim 37, further comprising the steps of:

translating a T/TCP packet into a TCP packet by deleting a CC option and a CCnew option from the T/TCP packet; and

translating a TCP packet into a T/TCP packet by adding CC, CCnew and/or CCecho options and setting a CC value to the TCP packet.

39. The protocol translation method claimed in claim 38, further comprising the steps of:

assigning a value that is 16 bytes less than the maximum size of the packet to an MSS option for a communication device that communicates by the TCP protocol; and

instructing the communication device to transmit data with a packet that is 16 bytes or more smaller than the maximum size of the packet.

40. The protocol translation method claimed in claim 37, further comprising the steps of:

uniquely identifying devices that send and receive packets in reference to the address of the respective devices and a port number; and

recording a setting to specify whether or not protocol translation is necessary and a setting to specify a type of translation when protocol translation is necessary;

wherein

protocol translation to relay the packets is conducted based on the protocol translation settings of the devices at sending end and receiving end.

41. The protocol translation method claimed in claim 38, further comprising the steps of:

uniquely identifying devices that send and receive packets in reference to the address of the respective devices and a port number; and

recording a setting to specify whether or not protocol translation is necessary and a setting to specify a type of translation when protocol translation is necessary;

wherein

protocol translation to relay the packets is conducted based on the protocol translation settings of the devices at sending end and receiving end.

42. The protocol translation method claimed in claim 39, further comprising the steps of:

uniquely identifying devices that send and receive packets in reference to the address of the respective devices and a port number; and

recording a setting to specify whether or not protocol translation is necessary and a setting to specify a type of translation when protocol translation is necessary;

wherein

protocol translation to relay the packets is conducted based on the protocol translation settings of the devices at sending end and receiving end.

37. A protocol translation method for conducting protocol translation to relay communication packets sent and received through a TCP channel and a T/TCP channel, comprising the steps of:

translating the TCP protocol into the T/TCP protocol to transmit the packets; and

translating the T/TCP protocol into the TCP protocol to transmit the packets.

43. A protocol translation program for conducting protocol translation to relay communication packets sent and received through a TCP channel and a T/TCP channel by controlling a computer, executing the translation from the TCP protocol into the T/TCP protocol and from the T/TCP protocol into the TCP protocol to transmit the packets.

44. The protocol translation program claimed in claim 43, for executing the process of:

translating a T/TCP packet into a TCP packet by deleting a CC option and a CCnew option from the T/TCP packet; and

translating a TCP packet into a T/TCP packet by adding CC, CCnew and/or CCecho options and setting a CC value to the TCP packet.

45. The protocol translation program claimed in claim 44, for executing the process of:

assigning a value that is 16 bytes less than the maximum size of the packet to an MSS option for a communication device that communicates by the TCP protocol; and

instructing the communication device to transmit data with a packet that is 16 bytes or more smaller than the maximum size of the packet.

46. The protocol translation program claimed in claim 43, for executing the process of:

uniquely identifying devices that send and receive packets in reference to the address of the respective devices and a port number; and

recording a setting to specify whether or not protocol translation is necessary and a setting to specify a type of translation when protocol translation is necessary;

wherein

protocol translation to relay the packets is conducted based on the protocol translation settings of the devices at sending end and receiving end.

47. The protocol translation program claimed in claim 44, for executing the process of:

uniquely identifying devices that send and receive packets in reference to the address of the respective devices and a port number; and

recording a setting to specify whether or not protocol translation is necessary and a setting to specify a type of translation when protocol translation is necessary;

wherein

protocol translation to relay the packets is conducted based on the protocol translation settings of the devices at sending end and receiving end.

48. The protocol translation program claimed in claim 45, for executing the process of:

uniquely identifying devices that send and receive packets in reference to the address of the respective devices and a port number; and

recording a setting to specify whether or not protocol translation is necessary and a setting to specify a type of translation when protocol translation is necessary;

wherein

protocol translation to relay the packets is conducted based on the protocol translation settings of the devices at sending end and receiving end.