The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 10, 2008
Filed:
May. 07, 2003
Jin-ru Chen, TaiChung, TW;
Chun-feng Liu, Taipei, TW;
Jin-Ru Chen, TaiChung, TW;
Chun-Feng Liu, Taipei, TW;
Realtek Semiconductor Corp., Hsinchu, TW;
Abstract
A NAPT apparatus and method implemented with hardware circuits inside a network switch controller is provided. The NAPT apparatus comprises: a translation table for storing related information of NAPT connections; an IP table for storing available translated IPs; a packet parser for receiving a packet to be performed NAPT, parsing related fields of the packet, and generating part of required indexes according to transmission direction of the packet; and a packet translation module for performing NAPT. For a forward packet, the NAPT method employs an indexing means of the translation table and IP table and a recording means to generate a translated IP and a translated port number of the forward packet. For a backward packet, a restoring action corresponding to the recording means is performed to restore required values, thereby checking validity of the backward packet and performing subsequent NAPT.