US20050044265A1 - Method for automatic configuration of an access router compatible with the DHCP protocol, for specific automatic processing of IP flows from a client terminal - Google Patents

Method for automatic configuration of an access router compatible with the DHCP protocol, for specific automatic processing of IP flows from a client terminal Download PDF

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Publication number
US20050044265A1
US20050044265A1 US10/884,131 US88413104A US2005044265A1 US 20050044265 A1 US20050044265 A1 US 20050044265A1 US 88413104 A US88413104 A US 88413104A US 2005044265 A1 US2005044265 A1 US 2005044265A1
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Prior art keywords
client
network
access router
values
dhcp
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US10/884,131
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English (en)
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Romain Vinel
Fabien Battello
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Orange SA
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France Telecom SA
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Assigned to FRANCE TELECOM reassignment FRANCE TELECOM ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BATTELLO, FABIEN, VINEL, ROMAIN
Publication of US20050044265A1 publication Critical patent/US20050044265A1/en
Priority to US12/400,480 priority Critical patent/US8260887B2/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0803—Configuration setting
    • H04L41/0806—Configuration setting for initial configuration or provisioning, e.g. plug-and-play
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/50—Address allocation
    • H04L61/5007—Internet protocol [IP] addresses
    • H04L61/5014—Internet protocol [IP] addresses using dynamic host configuration protocol [DHCP] or bootstrap protocol [BOOTP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/085—Retrieval of network configuration; Tracking network configuration history
    • H04L41/0853—Retrieval of network configuration; Tracking network configuration history by actively collecting configuration information or by backing up configuration information
    • H04L41/0856—Retrieval of network configuration; Tracking network configuration history by actively collecting configuration information or by backing up configuration information by backing up or archiving configuration information

Definitions

  • This invention relates to a method and device for automatic configuration of an access router compatible with the DHCP protocol for specific automatic processing of IP flows from a client terminal in a computer network, as a function of a given set of values of flow processing parameters corresponding to the client line from the client terminal, the access router routing DHCP traffic between the client terminal and any DHCP server on the network capable of proposing a lease to this client terminal.
  • the network part related to configuration according to the DHCP protocol comprises a client/server type architecture.
  • DHCP traffic between a terminal and a DHCP server denotes the traffic necessary for configuration of the terminal according to the DHCP protocol, by the server.
  • the connection line between a client terminal and an access router on which flows between the terminal and the router transit, is called the client line and therefore corresponds to the client terminal.
  • the invention relates to computer networks and the technical domain of the invention is configuration of equipment in such networks by means of configuration protocols and more particularly control of resources on network equipment (in other words configuration of this network equipment to program parameters specific to a client connection).
  • the networks considered are networks on which the traffic, and particularly communications between processes, depends on protocols (or sets of rules and procedures to be respected to send and receive data on a network) in the TCP/IP ( ⁇ Transmission Control Protocol/Internet Protocol >>) [1] series of communication protocols used on Internet.
  • the term network is equally applicable to a private network or a public network, or several private or public networks of telecommunication operators connected to each other through routers.
  • Connections or Internet accesses to these networks may be high speed, for example by ADSL ( ⁇ Asymmetric Digital Subscriber Line >>. Therefore, messages circulating on the networks considered are in the form of data packets (or IP datagrams) according to the IP protocol (or Internet protocol [2]), the terms IP traffic or IP flow will also be used (an IP flow is defined by elements contained in the header of IP packets (source or destination IP address, protocol, source or destination ports, service type, etc.)).
  • the DHCP ⁇ Dynamic Host Configuration Protocol >> [3] protocol enables client equipment connected to the network (or that renews its lease) to obtain its configuration, and particularly its IP address, dynamically from a DHCP server for the duration of the lease awarded by the server.
  • a client terminal network host
  • network host There are four phases involved in obtaining a lease by a client terminal, network host:
  • DHCP servers may be on the same network or they may be on different interconnected networks, and in this case they will need to install a DHCP relay agent on network equipment (often a router) so that it can intercept broadcast messages (that cannot normally pass through a router) and direct them towards the servers for which it knows the IP addresses and which are not on the client's LAN.
  • a DHCP relay agent relays DHCP messages between a client and a DHCP server that are not on the same LAN, so that a centralized DHCP service can be implemented for a set of local networks.
  • Applications of the invention relate to computer networks and telecommunication networks (digital subscriber lines at ordinary speed, for example with a client cable connection, or high speed lines, for example an ADSL connection) and Internet accesses of equipment to these networks.
  • telecommunication networks digital subscriber lines at ordinary speed, for example with a client cable connection, or high speed lines, for example an ADSL connection
  • Internet accesses of equipment to these networks.
  • PPP Point-to-Point Protocol
  • RADIUS Remote Authentication Dial-In User Service >>
  • processing of traffic consists of filtering an IP address or a port or a protocol (in this case protocol denotes a field in the header of IP packets that indicates the protocol supported above the IP protocol such as, for example, the TCP protocol [7] or the UDP protocol [8]), or limiting the transmission rate on some flows.
  • protocol denotes a field in the header of IP packets that indicates the protocol supported above the IP protocol such as, for example, the TCP protocol [7] or the UDP protocol [8]
  • COPS Common Open Policy Service protocol >>
  • MIDCOM MIDCOM
  • general purpose protocols for example such as SNMP [10] ( ⁇ Simple Network Management Protocol >>) or Telnet [11], that can be used to set parameters for network equipment, but in principle their implementation is now proprietary.
  • the result is a complex organization of the network control plan; when a DHCP server assigns an IP address to a client, it must invoke an entity responsible for control of network resources so that it can program (using another protocol) parameters specific to the newly connected client terminal, on the network equipment.
  • this manner of managing the configuration of a client terminal and management of its traffic has operating constraint disadvantages; an operating and maintenance mechanism is necessary that regularly detects changes to the client profile (in other words flow management parameters) that take place so that traffic parameters can be updated on the programmed network equipment (usually an access router). This mechanism is complicated to set up, particularly if it is necessary to take account of client profile modifications very quickly.
  • the invention is thus intended to overcome the disadvantages of prior art by enabling control of resources on network equipment, data transfers using the Internet protocol, to process IP flows sent or received by a client terminal on the network, fully compatible with the network elements configuration protocol so as to simplify the network control plan and to make it possible to quickly take account of a change in the client profile;
  • the configuration protocol selected in the invention should enable multicast and should be useable equally well on a LAN and on a network with Internet accesses (particularly with an ADSL connection).
  • the invention firstly completely associates the configuration phase of the client terminal considered and control of resources (unlike prior art) and chooses the DHCP protocol for dynamic configuration of the hosts in the network considered.
  • the DHCP protocol is used for configuration and for control of resources, which simplifies the control plan and enables fast (dynamic) updating of client profiles.
  • the DHCP protocol has the advantage of being simple and available on a wide range of different terminals.
  • the DHCP protocol is now used very broadly in LANs for the configuration of client terminals. Its use is becoming more widespread in telecommunication operator networks, both for cable and for ADSL connections.
  • This protocol was initially designed for use in LANs, but has gradually been extended to include some needs of public networks; in particular, it has option 82 [12] that enables a DHCP relay to insert a client line identification of the client terminal that makes this request into each DHCP request, this line identification information that corresponds to option 82 is called ‘DHCP-RAIO’ type information ( ⁇ DHCP-Relay Agent Information Option>>) in the remainder of this presentation.
  • the DHCP relay function enables network equipment to retransmit DHCP messages between clients and servers when the clients and servers are on different LANs and DHCP relay agents are used to implement a centralized DHCP service for a set of LANs.
  • the invention adds an important function that is missing in the DHCP protocol; namely, a function to set parameters on the access router that routes traffic for the client terminal considered, the manner in which traffic for the client to which DHCP has given an IP address should be processed.
  • the invention uses the DHCP configuration phase of the client terminal considered so that at the same time, it sets parameters controlling the manner in which the network should process traffic sent. by the terminal or to the terminal, by automatically configuring the access router that routes traffic between the terminal and the network (particularly traffic between the network and the DHCP terminal configuration server) as a function of values of IP flow processing parameters given for this terminal.
  • a client terminal When a client terminal is connected to the client line (connection line between the terminal and the DHCP server(s) capable of configuring it, through an access router) on the network, it sends a DHCPDISCOVER message on the network, and in response receives lease proposals from DHCP servers on the network, it accepts a proposal from a DHCP server (usually the first it receives) and sends a DHCPREQUEST message to accept the lease from the server and at this time, according to the invention, an identification information about the client line on which the client terminal is located, is inserted in the DHCPREQUEST request and after being completed, this request is sent to the server through the router.
  • This client line identification information is associated with values of flow processing parameters of the client line for the corresponding client terminal (client profile) and if these values are modified, the identification information is associated with the new values. According to the invention, all that is necessary is then to use this identification information contained in the completed DHCP request, for example the DHCPREQUEST request completed and distributed on the network, to obtain the corresponding set of flow processing parameter values and, depending on this set, to configure the access router so that it makes the corresponding processing on the flows that it is routing and that concern the terminal line.
  • the access router must obviously be configurable according to a profile, but this is the case for most routers at the moment. Those skilled in the art will note that the process according to the invention can easily be adapted to process the case in which the terminal is already connected to the network and renews its lease.
  • the invention is a process for automatic configuration of an access router compatible with the DHCP protocol, to perform specific automatic processing of IP flows from a client terminal in a computer network, as a function of a given set of flow processing parameter values corresponding to the client line of the client terminal, the access router routing DHCP traffic between the client terminal and every DHCP server on the network that can propose a lease to this client terminal, characterized in that it comprises the following steps consisting of:
  • step c) configuring the access router with the values of flow processing parameters obtained in step b) such that it is capable of carrying out the corresponding processing of packets in data flows routed on the client line corresponding to the identification information associated with these parameter values.
  • the client line identification information of the client terminal may also be inserted in step a) of the process, on any other type of DHCP message than the DHCPREQUEST relayed to a server (for example DHCPDISCOVER).
  • mode with specific processing is a method for automatic configuration of an access router according to the general mode, in which the values of flow processing parameters are capable of configuring the access router so that it can perform operations on routed flows consisting of:
  • this embodiment provides a means of applying a specific profile for managing flows at a client terminal, particularly when it is connected to the network.
  • a DHCP-RAIO type information (that can be used with the DHCP message option 82 ) as information for identification of the client line on which the client terminal is located, and this is why information used to identify the client terminal is DHCP-RAIO type information, in the mode with DHCP-RAIO according to the invention, which is a method for automatic configuration of an access router according to the general mode or according to the mode with specific processing.
  • mode with profiles server is a method for automatic configuration of an access router according to the general mode or according to the mode with specific processing or according to the mode with DHCP-RAIO, in which:
  • This embodiment is particularly advantageous when resources have to be controlled for a large number of terminals.
  • the invention also relates to a device for implementing a new router configuration process. More precisely, the invention also relates to a general device that is an automatic configuration device for an access router, compatible with the DHCP protocol, for performing specific automatic processing of IP flows from a client terminal in a computer network, as a function of a given set of values of flow processing parameters corresponding to the client line of the client terminal, the access router routing DHCP traffic between the client terminal and any DHCP server on the network that can propose a lease to this client terminal, characterized in that it comprises:
  • the invention also relates to a device with specific processing that is a device for automatic configuration of an access router according to the general device in which the values of flow processing parameters are used to configure the access router so that it can carry out the following operations on routed flows:
  • the invention also relates to a device for automatic configuration of an access router, called a device with DHCP-RAIO, which is a device according to the general device or according to the device with specific processing in which DHCP-RAIO type information is used to identify the client terminal.
  • a device with DHCP-RAIO which is a device according to the general device or according to the device with specific processing in which DHCP-RAIO type information is used to identify the client terminal.
  • the invention differs from prior art in several respects, and particularly by the important fact that the DHCP configuration process of a client terminal is no longer separate from the resource control process, and quite the contrary they are done concomitantly using the same protocol.
  • Applications of the invention relate to computer networks and telecommunication networks (with digital subscriber lines at ordinary speed for example with a client cable connection, or high speed lines, for example an ADSL connection), and Internet accesses of equipment to these networks.
  • FIG. 1 shows a diagram of a device according to the invention in which modules M 1 , M 2 and M 3 are implanted on the access router 2 .
  • FIG. 2 is a diagram of a device according to the invention in which modules M 1 and M 3 are implanted on the access router 21 and module M 2 is implanted on the DHCP server 31 .
  • FIG. 3 is a diagram of a device according to the invention in which the module M 1 is implanted on a relay agent DHCP 16 and modules M 2 and M 3 are implanted on the access router 22 .
  • FIG. 4 is a diagram of a device according to the invention in which module M 1 is implanted on a DHCP relay agent 16 , module M 2 is implanted on the DHCP server 31 and module M 3 is implanted on the access router 23 .
  • the corresponding particular embodiment and a method for automatic configuration of an access router according to the general mode or according to the mode with specific processing or according to the mode with DHCP-RAIO or according to the mode with profiles server in which:
  • FIG. 1 A first module implantation choice that is valid for any of the device versions mentioned above, is shown in FIG. 1 : modules M 1 , M 2 and M 3 are implanted on the access router 2 . The operation of the device is also indicated; the client terminal 1 sends a DHCPREQUEST message 4 to the insertion module M 1 5 that inserts terminal line identification information, or an identifier ID, into the message, and transmits the completed message 6 to the DHCP server 3 that responds to the terminal with a DHCPACK message 7 ; the module M 1 transmits the identifier ID 8 to the query module M 2 9 that sends a query request 10 to the profiles server SP 11 , which responds by transmitting values of flow processing parameters 12 corresponding to the identifier ID, to module M 2 ; module M 2 transmits these values 13 to the configuration module M 3 14 that then configures 15 the router to process flows for the terminal.
  • the client terminal 1 sends a DHCPREQUEST message 4 to the insertion module M 1 5 that inserts terminal
  • FIG. 2 A second choice for implantation of modules, valid for any of the versions of the device is shown in FIG. 2 ; differences from FIG. 1 are shown on the access router 21 in which the modules M 1 and M 3 are implanted, and on the DHCP server 31 in which module M 2 is implanted.
  • modules M 2 and M 3 are implanted on the access router 22 ; a DHCP relay agent 16 through which traffic passes between the client terminal 1 and the access router 22 , particularly towards the DHCP server 32 .
  • module M 1 is implanted on a DHCP relay agent through which traffic passes between the client terminal 1 and the access router 23 , particularly to the DHCP server 31 ;
  • module M 2 is implanted on the server 31 ;
  • module M 3 is implanted on the access router 23 .
US10/884,131 2003-07-04 2004-07-02 Method for automatic configuration of an access router compatible with the DHCP protocol, for specific automatic processing of IP flows from a client terminal Abandoned US20050044265A1 (en)

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FR2857187A1 (fr) 2005-01-07
US8260887B2 (en) 2012-09-04
EP1494391A1 (fr) 2005-01-05
US20100064032A1 (en) 2010-03-11
FR2857187B1 (fr) 2005-08-19
ES2340768T3 (es) 2010-06-09
ATE460028T1 (de) 2010-03-15
EP1494391B1 (fr) 2010-03-03

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