WO2009005212A1 - Procédé de transition ipv6 sur ipv4 et appareil servant à améliorer la performance d'un serveur de commande - Google Patents
Procédé de transition ipv6 sur ipv4 et appareil servant à améliorer la performance d'un serveur de commande Download PDFInfo
- Publication number
- WO2009005212A1 WO2009005212A1 PCT/KR2008/001982 KR2008001982W WO2009005212A1 WO 2009005212 A1 WO2009005212 A1 WO 2009005212A1 KR 2008001982 W KR2008001982 W KR 2008001982W WO 2009005212 A1 WO2009005212 A1 WO 2009005212A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ipv6
- control server
- tunnel
- terminal
- router
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 42
- 230000007704 transition Effects 0.000 title claims abstract description 38
- 241000065695 Teredo Species 0.000 description 6
- 238000013519 translation Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/60—Router architectures
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2212/00—Encapsulation of packets
Definitions
- IPV6 OVER IPV4 TRANSITION METHOD AND APPARATUS FOR IMPROVING PERFORMANCE OF CONTROL SERVER
- the present invention relates to a server based IPv6 over IPv4 transition method and apparatus, and more particularly, to a control server based IPv6 over IPv4 transition method and apparatus for improving performance of the control server.
- a control server based IPv6 over IPv4 transition method is a method
- RFC 2529 and RFC 3053 of creating a control tunnel to the control server in order to enable a service terminal to register its service in the control server and require converted address information on a terminal to be communicated.
- An IPv6 terminal requires an IPv4 address that can communicate with an IPv6 address of a reception terminal (the other side) from the control server by using the created control tunnel and obtains the IPv4 address.
- Each terminal transmits a tunnel creation request message to the control server in order to initially create a control tunnel so as to be registered in the control server, so that the aforementioned information can be managed.
- the translation method is a method in which a network address translator is provided between two different IP version networks to enable IPv6 and IPv4 connection. In this method, address translation has to be performed on all packets, so that there is a problem of extensibility.
- the server based transition (IPv6 over IPv4 transition) methods may be classified into tunnel broker (referred to as RFC 3053), Teredo, and intra-site automatic tunnel addressing protocol (ISATAP).
- RFC 3053 tunnel broker
- Teredo Teredo
- ISATAP intra-site automatic tunnel addressing protocol
- the tunnel broker is a device for relaying tunnels, and a terminal in an IPv4 network creates a tunnel to a gateway between the IPv4 and IPv6 networks.
- the control tunnel is created to enable a terminal in the IPv4 network to register its own information in a server to communicate with a terminal in the IPv6 network, and acquire information to communicate with a terminal on the other side.
- Teredo uses a method similar to the tunnel broker method but is not assigned officially by the Internet assigned numbers authority (IANA). However, in this method, a prefix for Teredo is defined additionally, and a protocol is designed to include a possibility in which a terminal in the IPv4 network is under the network address translation (NAT).
- NAT network address translation
- the tunnel broker method describes a general structure in the RFC 3063 but is practically implemented in consideration of address translation, so that the Teredo and the tunnel broker method are not much different from each other.
- Teredo can extract an IPv4 address from an IPv6 address, terminals can directly communicate with each other without passing through a device such as a Teredo relay, and this is a difference between the two methods.
- the ISATAP is an automatic tunneling method used between terminals or between a terminal and a router to provide communications between a terminal in an IPv4 intranet and another terminal in the same intranet or a terminal in an IPv6 public network connected to the intranet.
- This method is a protocol that is not standardized by RFC yet but basically provided in Microsoft Windows operating systems.
- ISATAP addresses use the interface identifier ::0:5EFE:w.x.y.z, in which w.x.y.z is an IPv4 address.
- the ISATAP interface identifier can be combined with any 64-bit prefix that is valid for IPv6 unicast addresses.
- the ISATAP address includes IPv4 source and destination addresses used to transmit ISATAP traffic through an IPv4 network such as an IPv4-compatible address, a 6over4 address, and a 6to4 address.
- the aforementioned general IPv6 over IPv4 transition method has problems in that as the number of service terminals increases, the number of control tunnels increases, and a control server has loads of tunnel management. This is because the control server measures a lifetime of each control tunnel and deletes or maintains the control tunnel after a service from a terminal is terminated. In addition, the control server enables forwarding to transmit data to the terminal to be communicated through the control tunnel. As described above, maintaining the control tunnel and data forwarding through the control tunnel may cause degradation in performance of the control server.
- the present invention provides an IPv6 over IPv4 transition method and apparatus for easily managing control tunnels regardless of the increase in the number of service terminals and enabling data forwarding through the tunnels to improve the performance of a control server and service stability.
- a method of performing IPv6 over IPv4 transition in a router connected between an IPv6 terminal and a control server to improve performance of the control server including steps of: receiving a tunnel creation request message from the control server operating on the basis of a tunnel creation request of the IPv6 terminal; transmitting a tunnel creation response message for the received tunnel creation request message to the IPv6 terminal through the control server; and performing IPv6 over IPv4 transition through a tunnel created by the IPv6 terminal that receives the tunnel creation response message.
- a method of performing IPv6 over IPv4 transition in a control server connected between an IPv6 terminal and a plurality of routers to improve performance of the control server including steps of: receiving a tunnel creation request message from the IPv6 terminal in an IPv4 network through the IPv4 network; selecting an edge router from the routers registered in advance to create a tunnel between the edge router and the IPv6 terminal; transmitting the tunnel creation request message to the selected edge router; receiving a tunnel creation response message corresponding to the tunnel creation request from the selected edge router and transmitting the received tunnel creation response message to the IPv6 terminal; and when the tunnel creation response message is received and the message is transmitted to the edge router from the IPv6 terminal through the created tunnel, receiving a message that is IPv6 transited over IPv4 from the edge router.
- an IPv6 terminal which is connected between an IPv6 terminal and a control server to perform IPv6 over IPv4 transition, including: an IPv6 terminal interface interfacing with the IPv6 terminal through an IPv4 network and setting a tunnel with the IPv6 terminal to transmit/receive messages; a forwarding controller, when the apparatus is selected as an edge router to set a tunnel by the control server and receives a tunnel creation request message from the control server, transmitting a tunnel creation response message including information on the apparatus to the control server, and when the IPv6 terminal receives the tunnel creation response message from the control server, performing IPv6 over IPv4 transition; a routing table registering routing information included in the tunnel creation request message; and a control server interface interfacing with the control server through IPv6 when receives a message from the IPv6 terminal through the created tunnel.
- FIG. 1 is a view illustrating tunnel configuration through edge routers in a server based IPv6 over IPv4 transition system according to an embodiment of the present invention.
- FIG. 2 is a view illustrating a detailed structure of the edge router according to the embodiment of the present invention.
- FIG. 3 is a view illustrating a process for setting a tunnel through the edge router in the server based IPv6 over IPv4 transition system according to the embodiment of the present invention.
- FIG. 4 is a view illustrating operations for determining a router to create a tunnel from a terminal performed by the control server according to the embodiment of the present invention.
- FIG. 1 is a view illustrating tunnel configuration through edge routers in a server based IPv6 over IPv4 transition system according to an embodiment of the present invention.
- FIG. 2 is a view illustrating a detailed structure of the edge router according to the embodiment of the present invention.
- FIG. 3 is a view illustrating a process for setting a tunnel through the edge router in the server based IPv6
- FIG. 5 is a view illustrating a tunnel request message transmitted from the control server to the router in the server based IPv6 over IPv4 transition system according to the embodiment of the present invention.
- FIG. 6 is a view illustrating a tunnel response message transmitted from the tunnel edge router to the control server in the server based IPv6 over IPv4 transition system according to the embodiment of the present invention.
- FIG. 7 is a view illustrating operations of processing control message packets for
- FIG. 8 is a view illustrating data forwarding in the server based IPv6 over IPv4 transition system according to the embodiment of the present invention.
- FIG. 9 is a view illustrating operations of checking connection between the edge router and the control server in the server based IPv6 over IPv4 transition system according to the embodiment of the present invention.
- FIG. 1 is a view illustrating a server based IPv6 over IPv4 transition system including tunnel edge routers and a server according to an embodiment of the present invention.
- the IPv6 over IPv4 transition system includes a plurality of terminals 101, a plurality of routers 102 for forming tunnels (referred to as IPv6 over IPv4 tunnels and hereinafter, referred to as control tunnels), and a control server 103 for selecting an edge router 102 for an available tunnel according to a tunnel creation request from a terminal 101 and transmitting/receiving messages to/from the terminal 101 through the selected edge router 102.
- IPv6 over IPv4 tunnels referred to as IPv6 over IPv4 tunnels and hereinafter, referred to as control tunnels
- the terminal 101 is an IPv6 terminal, requests tunnel creation of the control server
- the edge router 102 may be configured as a dual stack router that can process both
- the edge router 102 communicates with the terminal 101 that requests the tunnel creation through the control tunnel and performs IPv6 communication with the control server 103 through the transmission control protocol (TCP) so as to transmit an IPv4/IPv6 message (tunnel creation request message).
- TCP transmission control protocol
- the edge router 102 attempts initial connection to the control server 103, the edge router 102 transmits a message Init Msg. for a registration request to the control server to inform its presence and transmits the number of tunnels that are currently set and the number of tunnels that can be added to be set.
- the control server 103 adds (registers) a new router as the number of terminals 101 increases, stores information on the added router, and periodically checks status information on the added router to perceive whether or not the added router can be used. In addition, the control server 103 determines an edge router 102 that is to form a tunnel with the terminal 101 from among a plurality of the registered routers according to the number of tunnels and availability.
- edge router 102 that is a device for transiting communications between the terminal 101 and the control server 103 through the created tunnel in the IPv6 over IPv4 transition system having the aforementioned configuration is described in detail with reference to FIG. 2.
- FIG. 2 is a view illustrating a detailed structure of the edge router according to the embodiment of the present invention.
- the edge router 102 may include an IPv6 terminal interface 111, a forwarding controller 112, a routing table 113, and a control server interface 114.
- the IPv6 terminal interface 111 interfaces with the terminal 101 through an IPv4 network and sets a tunnel with the terminal 101 to transmit/receive messages.
- the forwarding controller 112 is selected as an edge router for setting a tunnel by the control server 103 to receive a tunnel creation request message from the control server 103 and generates a tunnel interface by using information included in the tunnel creation request message received from the control server 103.
- the forwarding controller 112 transits communications (referred to as IPv6 over IPv4 transition) between the terminal 101 and the control server 103 through the created tunnel.
- the forwarding controller 112 controls IPv6 data forwarding, informs the control server 103 of its presence to create a tunnel, and transmits its status information and information registered in the routing table 113.
- the status information includes the number of tunnels that are currently set in the edge router 102 and the number of tunnels that can be added to be set.
- the routing table 113 registers routing information (IPv4 and IPv6 addresses and the like) on the tunnel interface generated by the forwarding controller 112.
- the control server interface 114 performs interfacing to communicate with the control server 103 connected through the TCP, and when receives a message through the creased tunnel from the terminal 101, interfaces with the control server 103 through IPv6.
- FIG. 3 is a view illustrating a process for setting a tunnel through a router in the server based IPv6 over IPv4 transition system according to the embodiment of the present invention.
- a terminal 101 transmits a tunnel creation request message through the IPv4 network to a router 102. Accordingly, the router 102 transmits the tunnel creation request message to the control server 103 through message relaying.
- a control tunnel (referred to as an IPv6 over IPv4 tunnel) from the terminal 101 is not generated yet and an IPv4 message type is required, the tunnel creation request message is transmitted in the IPv4 message type.
- the control server 103 that receives the tunnel creation request message stores information (NAT, Port, IPv4 private address, IPv4 global address, IPv6 address, and the like) on terminals, and selects an edge router 102 of the tunnel from among a plurality of the routers to practically generate a control tunnel in consideration of the number of current tunnels, utilization of the tunnels, and the like.
- information NAT, Port, IPv4 private address, IPv4 global address, IPv6 address, and the like
- the edge router 102 selected in operation 203 receives the tunnel creation request message from the control server 103, and the edge router 102 selected in operation 204 transmits a tunnel creation response message to the control server 103.
- the selected edge router 102 creates a tunnel interface by using information included in the tunnel creation request message and registers routing information in the routing table 113.
- the edge router 102 transmits the tunnel creation response message including the received information for tunnel creation to the terminal
- the terminal 101 through the control server 103. Thereafter, in operation 206, the terminal 101 creates a control tunnel to the edge router 102 by using the information included in the tunnel creation response message.
- the terminal 101 requests information on a reception terminal to be communicated from the control server 103 through the created control tunnel.
- the terminal 101 sets the control tunnel with the router 102, and accordingly the router 102 communicates with the control server 103 through IPv6.
- FIG. 4 is a view illustrating operations for determining a router to create a tunnel from a terminal performed by the control server according to the embodiment of the present invention.
- control server 103 adds (registers) the new router, and in operation 302, the control server 103 stores information on the number of tunnels set by the new router or types of available tunnels and sets connection. By registering the new router in the control server 103 as needed as the number of service terminals increases, a proper router can be selected from among the registered routers as the edge router 102 to create a tunnel.
- the control server 103 retrieves edge router information stored in advance and selects an edge router to form a tunnel with the terminal 101 from the routers in operation 304.
- the control server 103 determines the number of tunnels set for each router, availability of tunnels, and an amount of data used for the tunnel and selects a proper router.
- control server 103 transmits the tunnel creation request message to the selected edge router 102 to instruct to set a tunnel in operation 305, receives a tunnel creation response message including a result of setting the tunnel from the edge router
- the tunnel creation request message includes an IP header, cmd, Type, Nat, LifeTime, an IPv4 address (referred to as a care of address (CoA)) of a terminal, and a field of an IPv6 address of a terminal, and the tunnel creation request message further includes a private CoA field when the terminal belongs to CoA and Nat.
- the cmd field represents an operation
- the Type field represents a tunnel type (for example, IPv6 over IPv4 and the like)
- the NatPort represents whether the terminal belongs to Nat.
- a structure of the tunnel creation response message is as illustrated in FIG. 6 and includes an IP header, cmd, result, reason, and an IPv6 address field of the terminal.
- the result field represents a tunnel setting result
- the reason field represents a cause in a case of failure.
- FIG. 7 is a view illustrating operations of processing control message packets for
- IPv6 over IPv4 transition according to the embodiment of the present invention.
- the control server 103 receives a control tunnel creation request message through IPv4 from the terminal 101. Accordingly, in operation 402, the control server 103 transmits the control tunnel creation request message to the router 102, receives a control tunnel creation response message from the router 102, and transmits the control tunnel creation response message to the terminal 101.
- the terminal 101 receives the control tunnel response message and generates a control tunnel. Thereafter, in operation 405, the terminal 101 requests information on a reception terminal that is to be communicated from the control server 103 by using the created control tunnel.
- the IPv6 over IPv4 control tunnel is used.
- the IPv4 header includes information including a router 102 disposed on the edge of the tunnel as a destination, and the IPv6 header includes information including the control server 103 as a destination.
- the router 102 since the IPv4 header included in the information request message indicates the router 102, the router 102 performs IPv6 lookup and transmits the reception terminal information request message including the lookup information to the control server 103. Thereafter, in operation 407, the router 102 receives a response message for the information request from the control server 103. Accordingly, in operation 408, the router 102 transmits a response message for the information request through the control terminal having a destination as the terminal 101.
- FIG. 8 data forwarding between transmission/reception terminals using the created control tunnel is as illustrated in FIG. 8.
- IPv6 routing information is set in the router at a point for generating the control tunnel, data forwarding using the control tunnel is possible.
- a first control tunnel is created between the transmission terminal 101 and the edge router 102, and packets forwarded through the control tunnel include data in a payload interval, and include information on the reception terminal and information on the router 102 in IPv6 and IPv4 headers and in the IPv4 header, respectively.
- a second control tunnel is created between the router 102 and the reception terminal 104, and packets forwarded through the second control tunnel include data in a payload interval, and include information on the reception terminal in the IPv6 header and the IPv4 header.
- the router 102 and the control server 103 periodically check the opposing statuses using TCP connection.
- the router 102 in operation 501, in a case where the router 102 attempts connection to the control server 103, the router 102 initially transmits a message Init Msg. for a registration request to the control server 103 to inform its presence and transmits information on the number of terminals that are set in the router 102 and the number of tunnels that can be added to be set. Thereafter, the control server 103 checks whether or not the router 102 can be used by using the received information and transmits a registration request response message including its information (address) to the router 102.
- a message Init Msg. for a registration request to the control server 103 to inform its presence and transmits information on the number of terminals that are set in the router 102 and the number of tunnels that can be added to be set.
- the control server 103 checks whether or not the router 102 can be used by using the received information and transmits a registration request response message including its information (address) to the router 102.
- the router 102 receives the registration request response message from the control server 103 and in operation 503, sets connection with the control server 103.
- the router 102 receives a status information request message for periodic status maintenance from the control server 103, and in operation 505, the router 102 transmits a status information response message to the control server 103. Accordingly, the control server 103 can periodically check whether or not the router 102 is in an available status. Here, if there is no response within a predetermined time, the control server 103 recognizes that the edge router 102 it not available and does not transmit a tunnel creation message.
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Abstract
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010514588A JP5385269B2 (ja) | 2007-07-04 | 2008-04-08 | 制御サーバの性能を向上させるためのIPv6−IPv4転換方法及び装置 |
US12/667,379 US8891551B2 (en) | 2006-12-01 | 2008-04-08 | IPv6 over IPv4 transition method and apparatus for improving performance of control server |
CN2008801056596A CN101796769B (zh) | 2007-07-04 | 2008-04-08 | 用于改善控制服务器性能的因特网协议版本4上的因特网协议版本6转变方法和设备 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020070067266A KR100882355B1 (ko) | 2006-12-01 | 2007-07-04 | 제어 서버의 성능 향상을 위한 IPv6-IPv4 전환방법 및 시스템 |
KR10-2007-0067266 | 2007-07-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009005212A1 true WO2009005212A1 (fr) | 2009-01-08 |
Family
ID=40229166
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/KR2008/001982 WO2009005212A1 (fr) | 2006-12-01 | 2008-04-08 | Procédé de transition ipv6 sur ipv4 et appareil servant à améliorer la performance d'un serveur de commande |
Country Status (3)
Country | Link |
---|---|
JP (1) | JP5385269B2 (fr) |
CN (1) | CN101796769B (fr) |
WO (1) | WO2009005212A1 (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011045062A (ja) * | 2009-08-19 | 2011-03-03 | Korea Electronics Telecommun | Iptvサービス提供システムおよび方法 |
US8457014B2 (en) | 2006-12-04 | 2013-06-04 | Electronics And Telecommunications Research Institute | Method for configuring control tunnel and direct tunnel in IPv4 network-based IPv6 service providing system |
US8594099B2 (en) | 2008-12-04 | 2013-11-26 | Electronics And Telecommunications Research Institute | Tunneling-based mobility support equipment and method |
US8811405B2 (en) | 2009-08-19 | 2014-08-19 | Electronics And Telecommunications Research Institute | System and method for providing IPTV service |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10630505B2 (en) * | 2015-01-28 | 2020-04-21 | Umbra Technologies Ltd. | System and method for a global virtual network |
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US7031328B2 (en) * | 2003-03-10 | 2006-04-18 | Cisco Technology, Inc. | Arrangement for traversing an IPv4 network by IPv6 mobile routers |
KR20060111810A (ko) * | 2005-04-25 | 2006-10-30 | 경희대학교 산학협력단 | 이동 IPv6 네트워크의 이동 노드와 IPv4 네트워크의대응 노드 사이의 통신 방법 |
US20060259608A1 (en) * | 2005-05-11 | 2006-11-16 | Sung-Gi Kim | Method and apparatus for processing packet in IPv4/IPv6 combination network |
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JP2004104664A (ja) * | 2002-09-12 | 2004-04-02 | Telecommunication Advancement Organization Of Japan | ネットワーク接続装置 |
KR100560737B1 (ko) * | 2003-02-18 | 2006-03-13 | 삼성전자주식회사 | 듀얼스택을 이용한 아이피브이4 - 아이피브이6 전환 장치및 그 방법 |
US20040196843A1 (en) * | 2003-02-20 | 2004-10-07 | Alcatel | Protection of network infrastructure and secure communication of control information thereto |
US7554991B2 (en) * | 2003-06-27 | 2009-06-30 | Nokia Corporation | Method, system and network element for data transmission using a transition mechanism |
KR20050054663A (ko) * | 2003-12-05 | 2005-06-10 | 한국전자통신연구원 | 무선 패킷 서비스 망에서의 부하 분산 방법 및 이를이용한 호 설정 방법 |
GB2413464A (en) * | 2004-04-21 | 2005-10-26 | Orange Sa | An inter-working unit with a protocol conversion or protocol encapsulation function, for use with dual stack user equipment on a packet radio network |
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2008
- 2008-04-08 CN CN2008801056596A patent/CN101796769B/zh not_active Expired - Fee Related
- 2008-04-08 WO PCT/KR2008/001982 patent/WO2009005212A1/fr active Application Filing
- 2008-04-08 JP JP2010514588A patent/JP5385269B2/ja not_active Expired - Fee Related
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US7031328B2 (en) * | 2003-03-10 | 2006-04-18 | Cisco Technology, Inc. | Arrangement for traversing an IPv4 network by IPv6 mobile routers |
KR20060111810A (ko) * | 2005-04-25 | 2006-10-30 | 경희대학교 산학협력단 | 이동 IPv6 네트워크의 이동 노드와 IPv4 네트워크의대응 노드 사이의 통신 방법 |
US20060259608A1 (en) * | 2005-05-11 | 2006-11-16 | Sung-Gi Kim | Method and apparatus for processing packet in IPv4/IPv6 combination network |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US8457014B2 (en) | 2006-12-04 | 2013-06-04 | Electronics And Telecommunications Research Institute | Method for configuring control tunnel and direct tunnel in IPv4 network-based IPv6 service providing system |
US8594099B2 (en) | 2008-12-04 | 2013-11-26 | Electronics And Telecommunications Research Institute | Tunneling-based mobility support equipment and method |
JP2011045062A (ja) * | 2009-08-19 | 2011-03-03 | Korea Electronics Telecommun | Iptvサービス提供システムおよび方法 |
US8811405B2 (en) | 2009-08-19 | 2014-08-19 | Electronics And Telecommunications Research Institute | System and method for providing IPTV service |
Also Published As
Publication number | Publication date |
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JP5385269B2 (ja) | 2014-01-08 |
JP2010532616A (ja) | 2010-10-07 |
CN101796769B (zh) | 2013-03-27 |
CN101796769A (zh) | 2010-08-04 |
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