Patent US6178455B1 successfully refreshed from Google Patents.
US6178455B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Router which dynamically requests a set of logical network addresses and assigns addresses in the set to hosts connected to the router
Assignee: Cisco Technology Inc
•
Filing: 1997-04-11
•
Granted: 2001-01-23
•
Expires: 2017-04-11
Abstract
Abstract The problem of wasting IP addresses by statically assigning them to hosts is solved as follows: when a cable router or RF modem becomes active, it sends a message requesting a set of IP addresses from the head end, which dynamically assigns the set of IP addresses and sends a message comprising the set of IP addresses to the cable router or RF modem. The cable router or RF modem then responds to requests by the hosts for IP addresses by assigning them IP addresses from the set. Furthermore, the set of IP addresses is released when the session terminates with the cable router or RF modem.
Inventors
- 👤 Mark E. Schutte
- 👤 Scott E. Hrastar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:57
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/65; H04H20/76; H04H20/77; H04H20/78; H04H20/79; H04L; H04L12/00; H04L12/28; H04L12/2801; H04L12/2854; H04L12/2856; H04L12/2863; H04L12/2869; H04L12/287; H04L12/2872; H04L12/2874; H04L12/54; H04L12/56; H04L12/5691; H04L12/5692; H04L41/00; H04L41/02; H04L41/0213; H04L41/06; H04L41/0654; H04L41/0663; H04L41/0677; H04L61/00; H04L61/50; H04L61/5007; H04L61/5014; H04L61/5061; H04L63/00; H04L63/08; H04L69/00; H04L69/40; H04L9/00; H04L9/40; H04N; H04N21/00; H04N21/20; H04N21/25; H04N21/258; H04N21/25808; H04N21/25816; H04N21/40; H04N21/41; H04N21/426; H04N21/42676; H04N21/60; H04N21/61; H04N21/6106; H04N21/6118; H04N21/6156; H04N21/6168; H04N7/00; H04N7/16; H04N7/173; H04N7/17309; H04H60/00; H04H60/76; H04H60/81; H04H60/82; H04H60/83; H04H60/84; H04L2101/00; H04L2101/60; H04L2101/604; H04L2101/618; H04L2101/622
Claims Analysis
Total Claims: 67
Claim 1
Independent Claim
185 words
A method employed in a router which is coupled between a first bidirectional link and a second bidirectional link of dynamically assigning a logical internet protocol network address to a host on the second bidirectional link, the method comprising the steps performed in the router of: obtaining a set of logical internet protocol network addresses for hosts on the second bidirectional link from a logical address assignment agent that dynamically assigns the set of logical internet protocol network addresses and is accessible via the first bidirectional link, the set of logical internet protocol network addresses being obtained by sending a request to the logical address assignment agent, the request specifying a number of logical internet protocol network addresses to be obtained, the number of logical internet protocol network addresses indicating how many logical internet protocol addresses are to be returned from the logical address assignment agent in the set of logical internet protocol network addresses; and responding to a request from a host for a logical internet protocol network address by assigning one of the set of logical internet protocol network addresses to the host.
Claim 2
Independent Claim
185 words
A method employed in a router which is coupled between a first bidirectional link and a second bidirectional link of dynamically assigning a logical internet protocol network address to a host on the second bidirectional link, the method comprising the steps performed in the router of: obtaining a set of logical internet protocol network addresses for hosts on the second bidirectional link from a logical address assignment agent that dynamically assigns the set of logical internet protocol network addresses and is accessible via the first bidirectional link, the set of logical internet protocol network addresses being obtained by sending a request to the logical address assignment agent, the request specifying a number of logical internet protocol network addresses to be obtained, the number of logical internet protocol network addresses indicating how many logical internet protocol addresses are to be returned from the logical address assignment agent in the set of logical internet protocol network addresses; and responding to a request from a host for a logical internet protocol network address by assigning one of the set of logical internet protocol network addresses to the host.
Claim 3
Dependent Claim
35 words
The method of claim 1 , further comprising the steps of: assigning said host a temporary logical internet protocol network address while said router obtains said set of dynamically assignable logical internet protocol network addresses.
Claim 4
Dependent Claim
25 words
The method of claim 1 , wherein said first bidirectional link is a Point-to-Point Protocol (PPP) link established between said router and a telephone modem.
Claim 5
Dependent Claim
49 words
The method of claim 2 , further comprising the steps of: transferring said host's authentication information via said first bidirectional link to a telephone modem; and transferring said authentication information via said telephone modem to an authorization agent wherein said authorization agent tests the validity of said authentication information.
Claim 6
Dependent Claim
14 words
The method of claim 4 wherein said authorization agent executes on a control server.
Claim 7
Dependent Claim
32 words
The method of claim 4 , wherein said logical address assignment agent executes on a control server, said control server comprising a list of assigned and unassigned logical internet protocol network addresses.
Claim 8
Dependent Claim
78 words
The method of claim 4 , further comprising the steps of: assigning dynamically a logical internet protocol network address to said router wherein said router can use TCP/IP protocols; implementing said logical address assignment agent to respond to a request by said router for said set of dynamically assignable logical internet protocol network addresses; and returning to said router said set of dynamically assignable logical internet protocol network addresses via said telephone modem and said first bidirectional link.
Claim 9
Dependent Claim
56 words
The method of claim 7 , wherein said set of dynamically assignable logical internet protocol network addresses is at least one logical internet protocol network addresses assignable to any said host coupled to said router via said second bidirectional link that makes at least one request for said at least one logical internet protocol network address.
Claim 10
Dependent Claim
69 words
The method of claim 7 , further comprising the step of: responding to a request from said host to said router via said second bidirectional link for a new logical internet protocol network address prior to the expiration of said temporary logical internet protocol network address wherein said host is assigned said new logical internet protocol network address from said set of dynamically assignable logical internet protocol network addresses.
Claim 11
Dependent Claim
49 words
The method of claim 9 , further comprising the steps of: transferring digital data received along a unidirectional link coupled to said router along said second bidirectional link to said host wherein said digital data is addressed to said new logical internet protocol network address assigned to said host.
Claim 12
Dependent Claim
41 words
The method of claim 1 , further comprising the steps of: implementing a telephone modem coupled to said router via said first bidirectional link; and implementing a telecommunication connection between said router and said telephone modem via said first bidirectional link.
Claim 13
Dependent Claim
19 words
The method of claim 11 , wherein said telephone modem is communicably coupled to a public switched telephone network.
Claim 14
Dependent Claim
20 words
The method of claim 6 , wherein said logical address assignment agent includes a dynamic host configuration protocol (DHCP) server.
Claim 15
Dependent Claim
34 words
The method of claim 6 , further comprising the step of: implementing an internet protocol (IP) manager on said control server to maintain said list of assigned and unassigned logical internet protocol network addresses.
Claim 16
Independent Claim
181 words
A method employed in a router which is coupled between a first path and a second path of dynamically assigning a logical internet protocol network address to a host on said second path, the method comprising the steps performed in the router of: obtaining a set of logical internet protocol network addresses for hosts on said second path from a logical address assignment agent that dynamically assigns said set of logical internet protocol network addresses and is accessible via said first path, the set of logical internet protocol network addresses being obtained by sending a request to the logical address assignment agent, the request specifying a number of logical internet protocol network addresses to be obtained, the number of logical internet protocol network addresses indicating how many logical internet protocol addresses are to be returned from the logical address assignment agent in the set of logical internet protocol network addresses; and responding to a request from a host for a logical internet protocol network address by dynamically assigning one of said set of logical internet protocol network addresses to said host.
Claim 17
Independent Claim
181 words
A method employed in a router which is coupled between a first path and a second path of dynamically assigning a logical internet protocol network address to a host on said second path, the method comprising the steps performed in the router of: obtaining a set of logical internet protocol network addresses for hosts on said second path from a logical address assignment agent that dynamically assigns said set of logical internet protocol network addresses and is accessible via said first path, the set of logical internet protocol network addresses being obtained by sending a request to the logical address assignment agent, the request specifying a number of logical internet protocol network addresses to be obtained, the number of logical internet protocol network addresses indicating how many logical internet protocol addresses are to be returned from the logical address assignment agent in the set of logical internet protocol network addresses; and responding to a request from a host for a logical internet protocol network address by dynamically assigning one of said set of logical internet protocol network addresses to said host.
Claim 18
Dependent Claim
35 words
The method of claim 15 , further comprising the steps of: assigning said host a temporary logical internet protocol network address while said router obtains said set of dynamically assignable logical internet protocol network addresses.
Claim 19
Dependent Claim
38 words
The method of claim 16 , further comprising the step of: transferring a host's authentication information from said router via said first path to an authentication agent wherein said authentication agent tests the validity of said authentication information.
Claim 20
Dependent Claim
14 words
The method of claim 17 wherein said authorization agent executes on a control server.
Claim 21
Dependent Claim
32 words
The method of claim 17 , wherein said logical address assignment agent executes on a control server, said control server comprising a list of assigned and unassigned logical internet protocol network addresses.
Claim 22
Dependent Claim
73 words
The method of claim 17 , further comprising the steps of: assigning dynamically a logical internet protocol network address to said router wherein said router can use TCP/IP protocols; implementing said logical address assignment agent to respond to a request by said router for said set of dynamically assignable logical internet protocol network addresses; and returning to said router said set of dynamically assignable logical internet protocol network addresses via said first path.
Claim 23
Dependent Claim
55 words
The method of claim 20 , wherein said set of dynamically assignable logical internet protocol network addresses is at least one logical internet protocol network addresses assignable to any said host coupled to said router via said second path that makes at least one request for said at least one logical internet protocol network address.
Claim 24
Dependent Claim
65 words
The method of claim 20 , further comprising the step of: responding to a request from said host via said second path for a new logical internet protocol network address prior to the expiration of said temporary logical internet protocol network address wherein said host is assigned said new logical internet protocol network address from said set of dynamically assignable logical internet protocol network addresses.
Claim 25
Dependent Claim
38 words
The method of claim 22 , further comprising the step of: transferring digital data received by said router addressed to said new logical internet protocol network address assigned to said host along said second path to said host.
Claim 26
Dependent Claim
16 words
The method of claim 19 , wherein said logical address assignment agent includes a DHCP server.
Claim 27
Dependent Claim
32 words
The method of claim 19 , further comprising the step of: implementing an IP manager on said control server to maintain said list of assigned and unassigned logical internet protocol network addresses.
Claim 28
Dependent Claim
38 words
The method of claim 25 , further comprising: implementing a simple network management protocol (SNMP) agent to execute on said control server and to assist said IP manager in assigning and deassigning said logical internet protocol network addresses.
Claim 29
Dependent Claim
76 words
The method of claim 23 , further comprising the steps of: detecting when a last host coupled to said router via said second path terminates communication with said router wherein no host is in communication with said router via said second path; and terminating all incoming and outgoing communication along said first path wherein said set of dynamically assignable logical internet protocol network addresses are released from assignment to said router and become available for reassignment.
Claim 30
Independent Claim
179 words
A system employed in a router which is coupled between a first path and a second path for dynamically assigning a logical internet protocol network address to a host on the second path, comprising: logic configured to obtain a set of dynamically assigned logical internet protocol network addresses for hosts on said second path, the set of logical internet protocol network addresses obtained by sending a request to the logical address assignment agent, the request specifying a number of logical internet protocol network addresses to be obtained, the number of logical internet protocol network addresses indicating how many logical internet protocol addresses are to be returned from the logical address assignment agent in the set of logical internet protocol network addresses; a logical address assignment agent that dynamically assigns said set of logical internet protocol network addresses and is accessible via said first path; and said router responding to a request from said host for one of said logical internet protocol network address by dynamically assigning one of said set of logical internet protocol network addresses to said host.
Claim 31
Independent Claim
179 words
A system employed in a router which is coupled between a first path and a second path for dynamically assigning a logical internet protocol network address to a host on the second path, comprising: logic configured to obtain a set of dynamically assigned logical internet protocol network addresses for hosts on said second path, the set of logical internet protocol network addresses obtained by sending a request to the logical address assignment agent, the request specifying a number of logical internet protocol network addresses to be obtained, the number of logical internet protocol network addresses indicating how many logical internet protocol addresses are to be returned from the logical address assignment agent in the set of logical internet protocol network addresses; a logical address assignment agent that dynamically assigns said set of logical internet protocol network addresses and is accessible via said first path; and said router responding to a request from said host for one of said logical internet protocol network address by dynamically assigning one of said set of logical internet protocol network addresses to said host.
Claim 32
Dependent Claim
36 words
The system of claim 28 , further comprising: logic configured to assign a temporary logical internet protocol network address to said host while said router obtains said set of dynamically assignable logical internet protocol network addresses.
Claim 33
Dependent Claim
31 words
The system of claim 29 , further comprising: host authentication information transferred via said first path to an authorization agent, wherein said authorization agent tests the validity of said authentication information.
Claim 34
Dependent Claim
14 words
The system of claim 30 wherein said authorization agent executes on a control server.
Claim 35
Dependent Claim
32 words
The system of claim 30 , wherein said logical address assignment agent executes on a control server, said control server maintaining a list of assigned and unassigned logical internet protocol network addresses.
Claim 36
Dependent Claim
81 words
The system of claim 30 , further comprising: logic configured to dynamically assign a logical internet protocol network address to said router by said logical address assignment wherein said router can use TCP/IP protocols; a request to said logical address assignment agent by said router for assignment of said set of dynamically assignable logical internet protocol network addresses; and logic configured to receive said set of dynamically assignable logical internet protocol network addresses returned to said router via said first path.
Claim 37
Dependent Claim
55 words
The system of claim 33 , wherein said set of dynamically assignable logical internet protocol network addresses is at least one logical internet protocol network addresses assignable to any said host coupled to said router via said second path that makes at least one request for said at least one logical internet protocol network address.
Claim 38
Dependent Claim
60 words
The system of claim 33 , further comprising: a request from said host via said second path for a new logical internet protocol network address prior to the expiration of said temporary logical internet protocol network address wherein said host is assigned said new logical internet protocol network address from said set of dynamically assignable logical internet protocol network addresses.
Claim 39
Dependent Claim
39 words
The system of claim 35 , further comprising: digital data received by said router addressed to said new logical internet protocol network assigned to said host wherein said digital data is transferred along said second path to said host.
Claim 40
Dependent Claim
133 words
A router which is coupled between a first path and a second path, comprising: means for obtaining a set of dynamically assignable logical internet protocol network addresses for hosts on said second path from a logical address assignment agent, the set of logical internet protocol network addresses being obtained by sending a request to the logical address assignment agent, the request specifying a number of logical internet protocol network addresses to be obtained, the number of logical internet protocol network addresses indicating how many logical internet protocol addresses are to be returned from the logical address assignment agent in the set of logical internet protocol network addresses; and means for dynamically assigning said host on said second path upon request one of said logical internet protocol network addresses dynamically assigned to said router.
Claim 41
Dependent Claim
133 words
A router which is coupled between a first path and a second path, comprising: means for obtaining a set of dynamically assignable logical internet protocol network addresses for hosts on said second path from a logical address assignment agent, the set of logical internet protocol network addresses being obtained by sending a request to the logical address assignment agent, the request specifying a number of logical internet protocol network addresses to be obtained, the number of logical internet protocol network addresses indicating how many logical internet protocol addresses are to be returned from the logical address assignment agent in the set of logical internet protocol network addresses; and means for dynamically assigning said host on said second path upon request one of said logical internet protocol network addresses dynamically assigned to said router.
Claim 42
Dependent Claim
16 words
The system of claim 32 , wherein said logical address assignment agent includes a DHCP server.
Claim 43
Dependent Claim
35 words
The system of claim 32 , further comprising the step of: logic configured to implement an IP manager on said control server to maintain said list of assigned and unassigned logical internet protocol network addresses.
Claim 44
Dependent Claim
38 words
The system of claim 39 , further comprising: logic configured to implement an a SNMP agent to execute on said control server and to assist said IP manager in assigning and deassigning said logical internet protocol network addresses.
Claim 45
Dependent Claim
79 words
The system of claim 36 , further comprising: logic configured to detect when a last host coupled to said router via said second path terminates communication with said router wherein no host is in communication with said router via said second path; and logic configured to terminate all incoming and outgoing communication along said first path wherein said set of dynamically assignable logical internet protocol network addresses are released from assignment to said router and become available for reassignment.
Claim 46
Dependent Claim
38 words
The system of claim 41 , wherein said set of dynamically assignable logical internet protocol network addresses are released from assignment to said router by a DHCP message sent to a logical address assignment agent instructing the release.
Claim 47
Dependent Claim
55 words
The system of claim 36 , further comprising: logic configured to detect when said router is inactive for a prescribed time; and logic configured to deassign said set of logical internet protocol network addresses from said router and make said set of logical internet protocol network addresses available for reassignment to another router upon request.
Claim 48
Dependent Claim
88 words
The system of claim 36 , further comprising: logic configured to monitor the period of time that a logical internet protocol network addresses is assigned to said router; and logic configured to deassign any from said router said logical internet protocol network addresses if said router fails to notify said logical address assignment agent of said router's continued utilization of said logical internet protocol network address within a preset time period wherein said logical internet protocol network address is made available for reassignment to another router upon request.
Claim 49
Dependent Claim
163 words
A router coupled between a first link and a second link for dynamically obtaining and assigning a logical internet protocol network address to at least one host on the second link, comprising: logic configured to dynamically obtain on the first link a set of logical internet protocol network addresses for at least one host on the second link, the set of logical internet protocol network addresses being obtained by sending a request to a logical address assignment agent, the request specifying a number of logical internet protocol network addresses to be obtained, the number of logical internet protocol network addresses indicating how many logical internet protocol addresses are to be returned from the logical address assignment agent in the set of logical internet protocol network addresses; and logic configured to respond to a request from said host and dynamically assign a logical internet protocol address from one of the set of logical internet protocol network addresses to said host on the second link.
Claim 50
Dependent Claim
163 words
A router coupled between a first link and a second link for dynamically obtaining and assigning a logical internet protocol network address to at least one host on the second link, comprising: logic configured to dynamically obtain on the first link a set of logical internet protocol network addresses for at least one host on the second link, the set of logical internet protocol network addresses being obtained by sending a request to a logical address assignment agent, the request specifying a number of logical internet protocol network addresses to be obtained, the number of logical internet protocol network addresses indicating how many logical internet protocol addresses are to be returned from the logical address assignment agent in the set of logical internet protocol network addresses; and logic configured to respond to a request from said host and dynamically assign a logical internet protocol address from one of the set of logical internet protocol network addresses to said host on the second link.
Claim 51
Dependent Claim
36 words
The router of claim 45 , wherein said router only obtains said set of logical internet protocol network addresses after at least one of said hosts makes a request for a logical internet protocol network address.
Claim 52
Dependent Claim
22 words
The router of claim 45 , wherein said router utilizes DCHP protocol to obtain said set of logical internet protocol network addresses.
Claim 53
Dependent Claim
36 words
The router of claim 45 , further comprising: logic configured to assign a temporary logical internet protocol network address to said host while said router obtains said set of dynamically assignable logical internet protocol network addresses.
Claim 54
Dependent Claim
35 words
The router of claim 48 , further comprising: a telephone modem coupled to said router via said first link; and a telecommunication connection implemented between said router and said telephone modem via said first link.
Claim 55
Dependent Claim
19 words
The router of claim 49 , wherein said router and said telephone modem a establish Point-to-Point Protocol (PPP) link.
Claim 56
Dependent Claim
49 words
The router of claim 49 , further comprising: host authentication information transmitted via said first link to said telephone modem; and an authorization agent accessible by said telephone modem wherein said authorization agent receives said authentication information from said telephone modem and tests the validity of said authentication information.
Claim 57
Dependent Claim
15 words
The router of claim 51 , wherein said authorization agent executes on a control server.
Claim 58
Dependent Claim
32 words
The router of claim 51 , wherein said logical address assignment agent executes on a control server, said control server comprising a list of assigned and unassigned logical internet protocol network addresses.
Claim 59
Dependent Claim
16 words
The router of claim 53 , wherein said logical address assignment agent includes a DHCP server.
Claim 60
Dependent Claim
32 words
The router of claim 53 , further comprising the step of: an IP manager executed on said control server to maintain said list of assigned and unassigned logical internet protocol network addresses.
Claim 61
Dependent Claim
32 words
The router of claim 55 , further comprising: a SNMP agent executed on said control server and to assist said IP manager in assigning and deassigning said logical internet protocol network addresses.
Claim 62
Dependent Claim
79 words
The router of claim 51 , further comprising: a logical internet protocol network address dynamically assigned to said router by said logical address assignment agent wherein said router can use TCP/IP protocols; a request to said logical address assignment agent by said router for assignment of said set of dynamically assignable logical internet protocol network addresses; and said set of dynamically assignable logical internet protocol network addresses returned to said router via said telephone modem and said first link.
Claim 63
Dependent Claim
55 words
The router of claim 57 , wherein said set of dynamically assignable logical internet protocol network addresses is at least one logical internet protocol network addresses assignable to any said host coupled to said router via said second link that makes at least one request for said at least one logical internet protocol network address.
Claim 64
Dependent Claim
63 words
The router of claim 57 , further comprising: a request from said host to said router via said second link for a new logical internet protocol network address prior to the expiration of said temporary logical internet protocol network address wherein said host is assigned said new logical internet protocol network address from said set of dynamically assignable logical internet protocol network addresses.
Claim 65
Dependent Claim
54 words
The router of claim 59 , further comprising: a unidirectional link coupled to said router; and digital data received by said router along said unidirectional link that is addressed to said new logical internet protocol network address assigned to said host wherein said digital data is transferred along said second link to said host.
Claim 66
Dependent Claim
75 words
The router of claim 60 , further comprising: logic configured to detect when a last host coupled to said router via said second path terminates communication with said router wherein no host is in communication with said router via said second path; and logic configured to terminate communication along said first path wherein said set of dynamically assignable logical internet protocol network addresses are released from assignment to said router and become available for reassignment.
Claim 67
Dependent Claim
38 words
The router of claim 61 , wherein said set of dynamically assignable logical internet protocol network addresses are released from assignment to said router by a DHCP message sent to said logical address assignment agent instructing the release.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-01-23 | 2004-07-24 | 2005-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-01-23 | 2008-07-24 | 2009-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-01-23 | 2012-07-24 | 2013-01-23 | $7700.00 | Window Closed / Lapsed |