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:
Dec. 28, 2010
Filed:
Feb. 24, 2005
Minoru Sekine, Tokyo, JP;
SO Sato, Tokyo, JP;
Minoru Sekine, Tokyo, JP;
So Sato, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A subscriber line accommodation device and packet filtering method is provided. In response to a request for acquisition of an IP address from a user terminal, a DHCP server in the subscriber line accommodation device allocates an IP address, registers a set of the allocated IP addresses, a MAC address of the user terminal, and a line number in a DHCP management table. The subscriber line accommodation device sets the registered information in an input filter section as a packet passing condition. Among packets sent from user terminals, the input filter section sends only those packets satisfying registered conditions toward a bridge forwarder and discards those packets not satisfying the conditions. Even when access is attempted by illegally using an IP address, the packet concerned is discarded unless the line number or a MAC address agrees.