Method and apparatus for communicating data between two hosts

• US 8,230,079 B2
• Filed: 12/28/2010
• Issued: 07/24/2012
• Est. Priority Date: 10/20/2003
• Status: Active Grant

• Current Assignee: Logitech Europe S A (Logitech International SA)
• Original Assignee: Logitech Europe S A (Logitech International SA)
• Inventors: Rosenberg, Aron, Wilson, Jeffrey
• Primary Examiner(s): Lee, Chun-Kuan
• Assistant Examiner(s): Abad, Farley
• Application Number:
  US12/979,811
• Publication Number:
  US 20110161501A1
• Time in Patent Office: 574 Days
• Field of Search: 709/227, 709/228, 710/4, 370/431
• US Class Current: 709/227
• CPC Class Codes: H04L 61/2514 between local and global IP addresses
• CPC Class Codes: H04L 61/4535 using an address exchange platform which sets up a session between two nodes, e.g. rendezvous servers, session initiation protocols [SIP] registrars or H.323 gatekeepers
• CPC Class Codes: H04L 63/0236 Filtering by address, protocol, port number or service, e.g. IP-address or URL
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/1101 Session protocols

Abstract

A method for communicating video data between at least a first host and a second host comprises: identifying, at a server, an address of the first host, to which the second host may communicate video data, and a sequence number expected by a network security system coupled between the first host and the server; and communicating, from the second host to the first host, video data using the address of the first host and the sequence number expected. The method may further comprise: identifying, at the server, an address of the second host, to which the first host may communicate video data, and a second sequence number expected by a network security system coupled between the second host and the server; and communicating, from the first host to the second host, video data using the address of the second host and the second expected sequence number. The second host may be adapted to perform the act of communicating without use of an intermediate server. The method may also further comprise communicating periodically, from the first host to the server, through the network security system, so as to maintain an open communication channel through the network security system to the first host at the address of the first host. The address of the first host may include address information and port information.

Claims

1. A method for establishing a low-latency communication channel to a host computer comprising:

identifying, at a server, an open port of a first intermediary system between the host computer and the server, and a sequence number expected by the first intermediate system coupled between the host computer and server;

opening, with the server, a first secondary communication channel from the server to the host computer, via the open port of the first intermediate system;

communicating periodically, from the server to the host computer, via the first secondary communication channel through the open port of the first intermediate system, to maintain the first secondary communication channel through the open port of the first intermediate system from the server to the host computer; and

transmitting the open port of the first intermediary system and the sequence number from the server to a second host computer to allow communication from the second host computer to the host computer through the first intermediate system using a low-latency communication channel established directly between the second host computer and the host computer, wherein the communication from the second host computer to the host computer is absent intervention from the server.

2. The method of claim 1, further comprising:

responding to the periodic communicating, from the host computer to the server, through the first intermediate system, to maintain the open first secondary communication channel through the first intermediate system to the host computer via the open port of the first intermediate system.

3. The method of claim 2, wherein communicating periodically and responding occur at a period shorter than a timeout period after which the first intermediate system closes the first secondary communication channel.

4. The method of claim 1, further comprising:

authenticating, by the host computer, communications received over the open low latency communication channel.

5. The method of claim 4, wherein the act of authenticating includes:

rejecting communications received over the open low latency communication channel where the rejected communications include at least one incorrect sequence number.

6. The method of claim 1, wherein the act of communicating periodically includes:

transmitting periodically at least one keep-alive message from the server to the host computer through the first intermediate system.

7. The method of claim 1, further comprising:

communicating periodically, from the server to the second host computer, via a second secondary communication channel through an open port of a second intermediate system coupled between the second host computer and server, to maintain the second secondary communication channel through the open port of the second intermediate system from the server to the second host computer, and

wherein transmitting the open port of the first intermediary system and the sequence number from the server to the second host computer includes transmitting the open port of the first intermediary system and the sequence number from the server to the second host computer via the second secondary communication channel.

8. A system for establishing a low-latency communication channel to a host computer;

the system comprising;

a server computer connected to a communication network and configured to communicate to the host computer via the communication network,

wherein, the server computer is further configured to identify an open port of a first intermediary system between the host computer and the server computer and to open a first secondary communication channel from the server to the host computer, via the open port of the first intermediary system,

wherein the server computer is further configured to communicate periodically with the host computer, via the first secondary communication channel through the open port of the first intermediary system, to maintain the first secondary communication channel, and

wherein the server computer is further configured to transmit the open port of the first intermediary server to a second host computer, allowing the second host computer to communicate with the host computer directly, via a low-latency communication channel through the first intermediary server and absent intervention from the server computer.

9. The system of claim 8, wherein the server computer is configured to identify the open port in a Network Address Translation (NAT) intermediary system.

10. The system of claim 8, wherein the server computer is configured to identify the open port in a firewall intermediary system.

11. The system of claim 8, wherein the server computer is further configured to identify an open port of a second intermediary system between the second host computer and the server computer and to open a second secondary communication channel from the server to the second host computer, via the open port of the second intermediary system, and

wherein the server computer is further configured to communicate periodically with the second host computer, via the second secondary communication channel through the open port of the second intermediary system, to maintain the second secondary communication channel.

12. A computer-readable medium comprising computer-executable instructions that, when executed on a processor of a server, perform a method for establishing a low-latency communication channel to a host computer comprising acts of:

identifying, at a server, an open port of a first intermediary system between the host computer and the server, and a sequence number expected by the first intermediate system coupled between the host computer and server;

opening, with the server, a first secondary communication channel from the server to the host computer, via the open port of the first intermediary system;

communicating periodically, from the server to the host computer, via the first secondary communication channel through the open port of the first intermediate system, to maintain the first secondary communication channel through the open port of the first intermediate system from the server to the host computer; and

transmitting the open port of the first intermediary server and the sequence number from the server to a second host computer to allow communication from the second host computer to the host computer through the first intermediate system using a low-latency communication channel established directly between the second host computer and the host computer and absent intervention from the server.

13. The computer-readable medium of claim 12, wherein the method further comprises:

responding to the periodic communicating, from the host computer to the server, through the first intermediate system, to maintain the open first secondary communication channel through the first intermediate system to the host computer via the open port of the first intermediate system.

14. The computer-readable medium of claim 13, wherein communicating periodically and responding occur at a period shorter than a timeout period after which the first intermediate system closes the first secondary communication channel.

15. The computer-readable medium of claim 12, wherein the method further comprises:

authenticating, by the host computer, communications received over the open low latency communication channel.

16. The computer-readable medium of claim 15, wherein the act of authenticating includes:

rejecting communications received over the open low latency communication channel where the rejected communications include at least one incorrect sequence number.

17. The computer-readable medium of claim 12, wherein the act of communicating periodically includes:

transmitting periodically at least one keep-alive message from the server to the host computer through the first intermediate system.

18. The computer-readable medium of claim 12, wherein the method further comprises:

communicating periodically, from the server to the second host computer, via a second secondary communication channel through an open port of a second intermediate system coupled between the second host computer and server, to maintain the second secondary communication channel through the open port of the second intermediate system from the server to the second host computer, and

wherein transmitting the open port of the first intermediary system and the sequence number from the server to the second host computer includes transmitting the open port of the first intermediary system and the sequence number from the server to the second host computer via the second secondary communication channel.