Source: http://www.google.com/patents/US7035917?dq=6335678
Timestamp: 2014-07-11 00:03:51
Document Index: 573311434

Matched Legal Cases: ['art 210', 'art 200', 'art 230', 'art 210', 'art 230', 'art 310', 'art 320', 'art 320', 'art 210', 'art 220', 'art 220', 'art 320', 'art 320', 'art 310']

Patent US7035917 - DHCP message based notification system which prevents registration of ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA main unit address restricted notification system has a main unit, two or more subordinate terminals which acquire an IP address of said main unit at a connection start, an address administration unit having a DHCP function, and a transmitting line for connecting these. The address administration unit...http://www.google.com/patents/US7035917?utm_source=gb-gplus-sharePatent US7035917 - DHCP message based notification system which prevents registration of unauthorized users while concurrently providing an IP addressAdvanced Patent SearchPublication numberUS7035917 B2Publication typeGrantApplication numberUS 10/090,625Publication dateApr 25, 2006Filing dateMar 6, 2002Priority dateMar 6, 2001Fee statusPaidAlso published asUS20020126658Publication number090625, 10090625, US 7035917 B2, US 7035917B2, US-B2-7035917, US7035917 B2, US7035917B2InventorsTetsuya YamasitaOriginal AssigneeNec CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (8), Non-Patent Citations (5), Referenced by (3), Classifications (18), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetDHCP message based notification system which prevents registration of unauthorized users while concurrently providing an IP addressUS 7035917 B2Abstract A main unit address restricted notification system has a main unit, two or more subordinate terminals which acquire an IP address of said main unit at a connection start, an address administration unit having a DHCP function, and a transmitting line for connecting these. The address administration unit attaches terminal identification information to a DHCP message from the subordinate terminals to the address administration unit at a connection start and also the address administration unit comprises a terminal identification information authorizing part which authorizes terminal identification information received and a main unit IP address information notifying unit which notifies only terminals which have passed the authorization of main unit IP address information.
a transmitting line which connects said main unit, said subordinate terminals, and said address administration unit,
wherein said DHCP server function part attaches an assigned IP address and also main unit IP address information to a DHCP message to terminals which have passed authorization and attaches only the assigned address IP address to a DHCP message to terminals which have failed in authorization.
3. A main unit address restricted notification system as set forth in claim 1, wherein
5. A main unit IP address restricted notification system, comprising:
6. A main unit address restricted notification system as set forth in claim 5, wherein
7. A main unit address restricted notification system as set forth in claim 5, wherein
8. A main unit address restricted notification system as set forth in claim 5, wherein
SUMMARY OF THE INVENTION An object of the present invention is to provide a main unit address restricted notification system which can improve safety.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a construction of a first embodiment of the main unit address restricted notification system according to the present invention,
FIG. 2 is a block diagram showing a construction of the telephone terminal control part of the first embodiment of the main unit address restricted notification system according to the present invention,
FIG. 3 is a block diagram showing a construction of the address administration unit of the first embodiment of the main unit address restricted notification system according to the present invention,
FIG. 4 is a block diagram showing a construction of the LAN telephone terminals of the first embodiment of the main unit address restricted notification system according to the present invention,
FIG. 5 is a sequence diagram showing operations of the first embodiment of the main unit address restricted notification system according to the present invention,
FIG. 6 is a sequence diagram showing operations of a second embodiment of the main unit address restricted notification system according to the present invention, and
FIG. 7 is a sequence diagram showing operations of a third embodiment of the main unit address restricted notification system according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a main unit address restricted notification system according to a preferred embodiment of the present invention will be described in detail with reference to the drawings. In the present embodiment, authorization when acquiring a system control unit address from an address administration unit at start-up of a LAN telephone terminal is used.
FIG. 1 is a block diagram showing a construction of an main unit address restricted notification system of the present embodiment, FIG. 2 is, similarly, a block diagram showing a construction of a telephone terminal control part of the present embodiment, FIG. 3 is, similarly, a block diagram showing a construction of an address administration unit of the present embodiment, and FIG. 4 is, similarly, a block diagram showing a construction of LAN telephone terminals of the present embodiment.
As shown in FIG. 1, in the main unit address restricted notification system using a DHCP function of the present invention, a system control unit 100, an address administration unit 200, and a plurality of LAN telephone terminals 300�30 n are connected to a LAN transmission line 400.
Furthermore, as shown in FIG. 3, the address administration unit 200 comprises a terminal identification information authorizing part 210, a DHCP server function part 200 and a main unit IP address information notifying part 230.
In the terminal identification information authorizing part 210, a judgement is made as to whether terminal identification information to be sent from the LAN telephone terminals 300�30 n can be approved in terms of a connection to the system control unit.
The main unit IP address information notifying part 230 notifies only terminals which have passed an authorization of main unit IP address information.
The LAN telephone terminals 300�30 n each comprise, as shown in FIG. 4, a call control part 310 and a DHCP client function part 320.
FIG. 5 is a sequence diagram showing operations of the main unit address restricted notification system according to the present embodiment.
First, to the LAN transmission line 400 to which the system control unit 100 and the address administration unit 200 as shown in FIG. 1, the LAN telephone terminals 300�30 n are connected and a power source is turned on.
DHCP client processing is caused to start from the DHCP client function part 320 of the LAN telephone terminals 300�30 n, and a DHCP Discover is sent to the address administration unit 200 (step S1).
After judgement, the terminal identification information authorizing part 210 notifies the DHCP server function part 220 of approval/disapproval, and in a case of approval, the DHCP server function part sends the LAN telephone terminals 300�30 n a DHCP Offer to which an IP address to be assigned and the option ID 160 (user-defined option: system control unit address) in the option defining field are attached (step S3).
In a case of disapproval, the DHCP server function part 220 attaches, to the DHCP Offer, only the IP address to be assigned and sends this to the LAN telephone terminals 300�30 n. The LAN telephone terminals 300�30 n which have received the DHCP Offer carry out DHCP Offer receiving processing at the DHCP client function part 320 and shifts to processing for sending a DHCP Request (step S4).
In a case of approval, a DHCP Ack to which an IP address to be assigned is attached and also has an option ID 160 (user-defined option: system control unit address) attached to the option defining field is sent to LAN telephone terminals 300�30 n (step S5).
In a case of disapproval, only the IP address to be assigned is attached to the DHCP Ack and this is sent to the LAN telephone terminals 300�30 n. The LAN telephone terminals 300�30 n which have received the DHCP Ack carries out DHCP Ack receiving processing at the DHCP client function part 320 and sets a terminal IP address (step S6).
Of the LAN telephone terminals 300�30 n, LAN telephone terminals which can acquire the system control unit address set the acquired system control unit address as a terminal registry.
Then, of the LAN telephone terminals 300�30 n, terminals which have acquired the IP address and system control unit address send, by processing at the call control part 310, a terminal registration request to the system control unit 100 (step S7).
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS6684243 *May 23, 2000Jan 27, 2004International Business Machines CorporationMethod for assigning a dual IP address to a workstation attached on an IP data transmission networkUS20030142805 *Aug 28, 2001Jul 31, 2003Hagay GritzerDigital recording of IP based distributed switching platformJP2000092107A Title not availableJP2000285050A Title not availableJP2001136171A Title not availableJPH09330284A Title not availableJPH11195000A Title not availableWO1998040986A1 *Feb 24, 1998Sep 17, 1998Ericsson Telefon Ab L MRegistration protocol* Cited by examinerNon-Patent CitationsReference1 *A protection Method against Unauthorized Access and Address Spoofing for Open Network Access Systems, Ishibashi, H., et. al., IEEE 0-7803-7080-5, May 2001, p. 10-13.2 *Network Access Control for DHCP Environment, Kobayashi, K. & Yamaguchi, S. INET 97, 7th Annual Conf Internet Society, Jun. 1997, p. 1-6.3 *PANS: Public Access Network Station, Imaizumi, T.; Machida, A.; Ishihara, T.; Parallel Processing, 1999. Proceedings. 1999 International Workshops on Sep. 21-24, 1999 page(s):220-225.4 *RFC 3118: Authentication for DHCP Messages, Droms, R., et. al. Jun. 2001, p. 1-17.5 *Self-Configuring Networks, Mcauley, A.J., et. al., IEEE 0-7803-6521-6, Jun. 2000, p. 315-319.* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS7522934 *Mar 12, 2004Apr 21, 2009Sony CorporationApparatus, method, recording medium, and program for controlling power of wireless communicationUS8275895Dec 21, 2006Sep 25, 2012Crimson CorporationSystems and methods for establishing a trusted dynamic host configuration protocol connectionUS8661252Jun 20, 2008Feb 25, 2014Microsoft CorporationSecure network address provisioning* Cited by examinerClassifications U.S. Classification709/220, 709/227International ClassificationG06F13/00, H04L12/28, H04L29/06, H04L29/12, H04L12/56, H04L29/08, H04L12/46, H04L12/40, G06F15/177Cooperative ClassificationH04L69/329, H04L67/14, H04L63/10, H04L61/2015European ClassificationH04L63/10, H04L61/20A1, H04L29/08N13Legal EventsDateCodeEventDescriptionSep 25, 2013FPAYFee paymentYear of fee payment: 8Sep 23, 2009FPAYFee paymentYear of fee payment: 4Aug 25, 2006ASAssignmentOwner name: NEC INFRONTIA CORPORATION, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NEC CORPORATION;REEL/FRAME:018160/0787Effective date: 20060816Mar 6, 2002ASAssignmentOwner name: NEC CORPORATION, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:YAMASHITA, TETSUYA;REEL/FRAME:012671/0266Effective date: 20020301RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google