Null-packet transmission from inside a firewall to open a...

Details Null-packet transmission from inside a firewall to open a... Null-packet transmission from inside a firewall to open a...

2005-06-22

2011-12-13

Dada, Beemnet (Department: 2435)

Information security

Access control or authentication

Network

Reexamination Certificate

active

08079072

ABSTRACT:
A high-bandwidth direct communication path between two clients is used for voice or video calls over the Internet. An opening or a window in a firewall is made for the direct path by sending a null packet out from inside the firewall. The null packet can be a UDP packet directed to a UDP port of the other client. Initially, each client makes a TCP connection to port80of an external manager. Each client registers its UDP port number with the external manager. A call request from one client to the external manager results in a message from the external manager to the other client. The other client then creates the window in its firewall by transmitting the null UDP packet. Then the external manager is notified and tells the calling client to begin sending UDP packets directly to the other client through the firewall window.

REFERENCES:
patent: 6104716 (2000-08-01), Crichton et al.
patent: 6219706 (2001-04-01), Fan et al.
patent: 6674713 (2004-01-01), Berg et al.
patent: 6687245 (2004-02-01), Fangman et al.
patent: 7254832 (2007-08-01), Christie, IV
patent: 2002/0101860 (2002-08-01), Thornton et al.
patent: 2003/0165136 (2003-09-01), Cornelius et al.
patent: 2004/0047358 (2004-03-01), Chen et al.
Dan Kegel, Nat and Peer-to-peer Networking, Internet Posted, Jul. 17, 1999.
M. Holdrege and P. Srisuresh, RFC 3027—Protocol Complications with the IP Network Address Translator, NWG-RFC, Jan. 2001.

Affiliated with

Also associated with

Rating

Null-packet transmission from inside a firewall to open a... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Null-packet transmission from inside a firewall to open a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Null-packet transmission from inside a firewall to open a... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4259494