CN118018513A - Multi-service channel DNS query method and device based on port binding - Google Patents

Multi-service channel DNS query method and device based on port binding Download PDF

Info

Publication number
CN118018513A
CN118018513A CN202410007806.7A CN202410007806A CN118018513A CN 118018513 A CN118018513 A CN 118018513A CN 202410007806 A CN202410007806 A CN 202410007806A CN 118018513 A CN118018513 A CN 118018513A
Authority
CN
China
Prior art keywords
dhcp
port
service channel
dns
message
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202410007806.7A
Other languages
Chinese (zh)
Inventor
王健
沈瑞
陈金花
黄兴
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fiberhome Telecommunication Technologies Co Ltd
Original Assignee
Fiberhome Telecommunication Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fiberhome Telecommunication Technologies Co Ltd filed Critical Fiberhome Telecommunication Technologies Co Ltd
Priority to CN202410007806.7A priority Critical patent/CN118018513A/en
Publication of CN118018513A publication Critical patent/CN118018513A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H04L61/09—Mapping addresses
    • H04L61/25—Mapping addresses of the same type
    • H04L61/2503—Translation of Internet protocol [IP] addresses
    • H04L61/255—Maintenance or indexing of mapping tables
    • H04L61/2553—Binding renewal aspects, e.g. using keep-alive messages
    • 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
    • H04L61/45—Network directories; Name-to-address mapping
    • H04L61/4505—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols
    • H04L61/4511—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols using domain name system [DNS]

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The invention discloses a port binding-based multi-service channel DNS query method, which comprises the following steps: when the service channel configuration or state of the gateway changes, the binding relation between DNS SERVER and the physical port of each service channel is updated and recorded in a storage file; when receiving a DHCP DISCOVERY or DHCP REQUEST REQUEST, the kernel layer constructs a new DHCP OPTION according to the source port of the message, and is added at the end of the original DHCP OPTION message; when the DHCP request message reaches an application layer, analyzing the DHCP OPTION of the message to obtain a source port of the message, searching a binding relation storage file, and searching DNS SERVER bound to the port; and filling DNS SERVER into the DHCP OFFER response message, and returning to the LAN side equipment. The invention solves the problem that the prior gateway can only carry out DNS analysis through the internet service by realizing DNS inquiry isolation of multiple service channels, is beneficial to the construction of DNS environment of non-public network service, and improves the network stability and gateway performance. The invention also discloses a corresponding multi-service channel DNS query device based on port binding.

Description

Multi-service channel DNS query method and device based on port binding
Technical Field
The invention belongs to the technical field of home gateways, and particularly relates to a port binding-based multi-service channel DNS query method and device.
Background
The home gateway has a plurality of service channels, such as internet service, personal interactive television (INTERACTIVE PERSONALITY TV, abbreviated IPTV) service, voice service. Meanwhile, the home gateway is also provided with a plurality of downlink physical ports which are connected with local area network (Local Area Network, abbreviated as LAN) side equipment. The service channels are isolated from each other, the internet service is usually connected to a public network, and the non-internet service is usually connected to a private network.
In the multi-service mode, if a routing mode is adopted, a policy route is generally set, and an internet protocol (Internet Protocol, abbreviated as IP) request on the LAN side is forwarded to a corresponding service channel. However, after a Domain name system (Domain NAME SYSTEM, abbreviated as DNS) request initiated by the LAN side is sent to the DNS proxy of the gateway, since the DNS proxy only has DNS SERVER of the internet service channel, all DNS requests will be forwarded to DNS SERVER of the internet service channel, resulting in failure of DNS resolution of other services and data failure.
With the development of communication technology, more and more home electronic devices and more home gateway bearing services are provided, and a plurality of service types are borne through a private network, so that DNS inquiry isolation of different service channels is realized, and the service bearing capacity of the home gateway can be effectively improved.
Disclosure of Invention
In order to solve the problem, the invention binds the DNS inquiry of the service channel and the downlink physical port of the equipment, and the DNS requests sent by the LAN equipment connected with different physical ports can be forwarded to different DNS servers at the upper layer through different service channels, thereby realizing the service isolation of the DNS inquiry.
To achieve the above object, according to one aspect of the present invention, there is provided a multi-service channel DNS query method based on port binding, including the steps of:
When the service channel configuration or state of the gateway changes, the binding relation between DNS SERVER and the physical port of each service channel is updated and recorded in a storage file;
when receiving a DHCP DISCOVERY or DHCP REQUEST REQUEST, the kernel layer constructs a new DHCP OPTION according to the source port of the message, and is added at the end of the original DHCP OPTION message;
when the DHCP request message reaches an application layer, analyzing the DHCP OPTION of the message to obtain a source port of the message, searching a binding relation storage file, and searching DNS SERVER bound to the port; and filling DNS SERVER into the DHCP OFFER response message, and returning to the LAN side equipment.
In one embodiment of the present invention, the DHCP OPTION includes the following fields:
code: representing the OPTION type;
Len: representing the length of value;
Value: is the value of OPTION and is used to populate the name of the source port.
In one embodiment of the present invention, the constructing a new DHCP OPTION according to the source port of the message specifically includes: the DHCP DISCOVERY or DHCP REQUEST message is modified on the INPUT chain of the filter table of ebtables of the kernel layer or BROUTING chain of broute table, and the DHCP OPTION containing the source port is added.
In one embodiment of the present invention, the DNS SERVER for finding out the port binding is specifically: and analyzing DNS SERVER corresponding to the DHCP operation source port, and selecting DNS SERVER of the internet surfing service as a default DNS SERVER if the port-containing DHCP operation is not analyzed.
In one embodiment of the present invention, the method for generating the storage file is as follows: the method comprises the steps of configuring service channel connection of local WEB configuration equipment remotely or designating the binding relation between the service channel connection and a port; when the equipment is started, the service channel acquires an IP address through DHCP or PPPOE, and then acquires DNS SERVER addresses of the corresponding service channel; and storing the mapping relation between DNS SERVER and ports of the service channel to a storage file.
According to another aspect of the present invention, there is also provided a multi-service channel DNS query device based on port binding, including a DNS binding module, a DHCP marking module, and a DHCP service module, where:
The DNS binding module is used for updating the binding relation between DNS SERVER and the physical port of each service channel when the service channel configuration or the state of the gateway changes, and recording the binding relation into a storage file;
The DHCP marking module is used for constructing a new DHCP OPTION according to a source port of the message by the kernel layer when receiving a DHCP DISCOVERY or DHCP REQUEST REQUEST, and attaching the new DHCP OPTION to the last of the original DHCP OPTION message;
The DHCP service module is used for analyzing the DHCP OPTION of the message after the DHCP request message reaches the application layer to obtain a source port of the message, searching a binding relation storage file and searching DNS SERVER bound by the port; and filling DNS SERVER into the DHCP OFFER response message, and returning to the LAN side equipment.
In one embodiment of the present invention, the DHCP OPTION includes the following fields:
code: representing the OPTION type;
Len: representing the length of value;
Value: is the value of OPTION and is used to populate the name of the source port.
In one embodiment of the present invention, the constructing a new DHCP OPTION according to the source port of the message specifically includes: the DHCP DISCOVERY or DHCP REQUEST message is modified on the INPUT chain of the filter table of ebtables of the kernel layer or BROUTING chain of broute table, and the DHCP OPTION containing the source port is added.
In one embodiment of the present invention, the DNS SERVER for finding out the port binding is specifically: and analyzing DNS SERVER corresponding to the DHCP operation source port, and selecting DNS SERVER of the internet surfing service as a default DNS SERVER if the port-containing DHCP operation is not analyzed.
In one embodiment of the present invention, the method for generating the storage file is as follows: the method comprises the steps of configuring service channel connection of local WEB configuration equipment remotely or designating the binding relation between the service channel connection and a port; when the equipment is started, the service channel acquires an IP address through DHCP or PPPOE, and then acquires DNS SERVER addresses of the corresponding service channel; and storing the mapping relation between DNS SERVER and ports of the service channel to a storage file.
In general, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:
(1) The DNS inquiry isolation of multiple service channels is realized, so that different services access different DNS servers, and the problem that the existing gateway can only conduct DNS analysis through internet service is solved;
(2) The construction of DNS environment of non-public network service is facilitated, and the privacy and safety of users can be better protected by sending DNS inquiry requests of different service channels to different DNS servers;
(3) The client directly initiates DNS inquiry to the remote DNS server without passing through the DNS proxy of the gateway, so that the problem that the DNS proxy of the gateway fails to influence all services is avoided, the network stability is improved, and the performance load of the gateway is reduced;
In summary, the invention solves the problem that the existing gateway can only carry out DNS analysis through the internet service by realizing DNS query isolation of multiple service channels, is beneficial to the construction of DNS environment of non-public network service, and improves the network stability and gateway performance.
Drawings
Fig. 1 is a schematic diagram of a multi-service channel DNS query method based on port binding according to an embodiment of the present invention;
FIG. 2 is a flow chart of DNS port binding provided by an embodiment of the present invention;
fig. 3 is a flowchart of DHCP port labeling according to an embodiment of the present invention;
fig. 4 is a flowchart of issuing DNS SERVER DHCP to a LAN side device according to an embodiment of the present invention;
Fig. 5 is a schematic diagram of DNS query provided in an embodiment of the present invention;
Fig. 6 is a field explanatory diagram of DHCP extension OPTION provided by the embodiment of the present invention;
Fig. 7 is a schematic structural diagram of a multi-service channel DNS query device based on port binding according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
In order to address the above drawbacks or improvements of the prior art, as shown in fig. 1, the present invention provides a multi-service channel DNS query method based on port binding, including:
S1, when the configuration or state of a service channel of a gateway is changed, updating the binding relation between DNS SERVER and a physical port of each service channel, and recording the binding relation in a storage file;
The binding relationship between DNS SERVER and the physical port of each service channel is specifically: establishing a host route for each DNS SERVER, wherein the exit of the route is a network interface of a corresponding service channel;
The method for generating the storage file comprises the following steps: the method comprises the steps of configuring service channel connection of local WEB configuration equipment remotely or designating the binding relation between the service channel connection and a port; when the equipment is started, the service channel acquires an IP address through DHCP or PPPOE, and then acquires DNS SERVER addresses of the corresponding service channel; storing the mapping relation between DNS SERVER and ports of the service channel to a storage file;
s2, when a DHCP DISCOVERY or a DHCP REQUEST REQUEST is received, the kernel layer builds a new DHCP OPTION according to a source port of the message, and the new DHCP OPTION is added at the end of the original DHCP OPTION message;
The DHCP OPTION message specifically includes: modifying a DHCP DISCOVERY or DHCP REQUEST message on an INPUT chain of a filter table of ebtables of the kernel layer or a BROUTING chain of a broute table, and adding a DHCP OPTION containing a source port;
S3, after the DHCP request message reaches the application layer, analyzing the DHCP OPTION of the message to obtain a source port of the message, and then searching a binding relation storage file to find DNS SERVER of port binding; filling DNS SERVER into a DHCP OFFER response message, and returning to the LAN side equipment;
Wherein, the DNS SERVER for finding out the port binding specifically is: DNS SERVER corresponding to the DHCP operation source port is analyzed, if the DHCP operation containing the port is not analyzed, the DNS SERVER of the Internet surfing service is selected as a default DNS SERVER;
further, the LAN side device requests DNS resolution from the corresponding DNS SERVER, and when the message passes through the gateway, the gateway sends out a DNS request from the network interface of the corresponding service channel according to the host route.
Example 1
As shown in fig. 2, the DNS port binding flow is as follows:
S201, a service channel of a remote configuration or local WEB configuration device is connected, and a binding relation between the service channel and a port is designated; when the service channel acquires an ip address through DHCP or PPPOE after the device is started, DNS SERVER addresses of the corresponding service channels are acquired.
S202: the mapping relation between DNS SERVER and ports of the service channel is saved to a storage file dns_port.map, as follows:
S203: and acquiring the dns_port.map and the if_name, configuring host routes for each dns_server, wherein the network interface of the next hop is the network interface if_name of the corresponding service channel.
As shown in fig. 3, the DHCP port labeling flow is as follows:
s301: and analyzing the received skb message by the kernel module, and judging whether the message is a DISCOVERY or REQUEST message of the DHCP.
S302: obtaining the source port name of the received packet from skb- > dev, for example: eth0.
S303: adding a DHCP operation with a port type at the tail part of the skb message, and marking the source port of the DHCP request as eth0.
As shown in fig. 6, in the DHCP OPTION field, the code represents the OPTION type, taking 1 byte, and an unused number between 224-254 may be selected as the private OPTION, for example 224 is selected to represent this is an OPTION of a port type; len represents the length of value, taking up 1 byte; value is the value of OPTION, which may be used here to populate the source port name, e.g., eth0, with the byte length specified by the len field.
As shown in fig. 4, the DHCP service flow is as follows:
S401: and the application layer DHCP SERVER analyzes the REQUESTs with the types of DISCOVERY and REQUEST when receiving the DHCP REQUEST sent by the LAN side user.
S402: analyzing the OPTION from the request message, judging whether the OPTION with the type of the port exists, executing S403 if the OPTION exists, and jumping to S406 if the OPTION does not exist.
S403: analyzing the operation value of the port type, and obtaining the corresponding port name, for example: eth0.
S404: the lookup DNS SERVER and port mapping table dns_port.map are then traversed.
S405: finding a corresponding DNS SERVER according to the port information, if the port is eth0 and the corresponding DNS SERVER is 10.10.10.10, executing S407; if the corresponding port information is not found, S406 is performed.
S406: DNS SERVER of the internet service is taken as a default DNS SERVER.
S407: and filling DNS SERVER in a DHCP OFFER message returned to the user.
As shown in fig. 5, the LAN-side user DNS query flow is as follows:
S501: when the user requests domain name resolution, DNS query requests are sent to the unique DNS SERVER, if the gateway eth0 port connected by the user is connected, the DNS query requests are sent to 10.10.10.10
S502: when the DNS query request passes through the gateway, the gateway sends data from the corresponding service WAN according to the host route DNS SERVER, and if the request DNS SERVER is 10.10.10.10, the DNS query request is forwarded from the WAN1 port.
Further, as shown in fig. 7, the present invention further provides a multi-service channel DNS query device based on port binding, which includes a DNS binding module, a DHCP marking module, and a DHCP service module, where:
The DNS binding module is used for updating the binding relation between DNS SERVER and the physical port of each service channel when the service channel configuration or the state of the gateway changes, and recording the binding relation into a storage file;
the method for generating the storage file comprises the following steps: the method comprises the steps of configuring service channel connection of local WEB configuration equipment remotely or designating the binding relation between the service channel connection and a port; when the equipment is started, the service channel acquires an IP address through DHCP or PPPOE, and then acquires DNS SERVER addresses of the corresponding service channel; and storing the mapping relation between DNS SERVER and ports of the service channel to a storage file.
The DHCP marking module is used for constructing a new DHCP OPTION according to a source port of the message by the kernel layer when receiving a DHCP DISCOVERY or DHCP REQUEST REQUEST, and attaching the new DHCP OPTION to the last of the original DHCP OPTION message;
The step of constructing a new DHCP operation according to the source port of the message comprises the following steps: the DHCP DISCOVERY or DHCP REQUEST message is modified on the INPUT chain of the filter table of ebtables of the kernel layer or BROUTING chain of broute table, and the DHCP OPTION containing the source port is added.
The DHCP service module is used for analyzing the DHCP OPTION of the message after the DHCP request message reaches the application layer to obtain a source port of the message, searching a binding relation storage file, searching DNS SERVER bound to the port, filling DNS SERVER into a DHCP OFFER response message, and returning to the LAN side device;
wherein, the DHCP OPTION includes the following fields:
code: representing the OPTION type;
Len: representing the length of value;
Value: is the value of OPTION and is used to populate the name of the source port.
Wherein, the DNS SERVER for finding out the port binding specifically is: and analyzing DNS SERVER corresponding to the DHCP operation source port, and selecting DNS SERVER of the internet surfing service as a default DNS SERVER if the port-containing DHCP operation is not analyzed.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims (10)

1. A multi-service channel DNS query method based on port binding is characterized by comprising the following steps:
When the service channel configuration or state of the gateway changes, the binding relation between DNS SERVER and the physical port of each service channel is updated and recorded in a storage file;
when receiving a DHCP DISCOVERY or DHCP REQUEST REQUEST, the kernel layer constructs a new DHCP OPTION according to the source port of the message, and is added at the end of the original DHCP OPTION message;
when the DHCP request message reaches an application layer, analyzing the DHCP OPTION of the message to obtain a source port of the message, searching a binding relation storage file, and searching DNS SERVER bound to the port; and filling DNS SERVER into the DHCP OFFER response message, and returning to the LAN side equipment.
2. The port binding based multi-service channel DNS query method according to claim 1, wherein the DHCP OPTION includes the following fields:
code: representing the OPTION type;
Len: representing the length of value;
Value: is the value of OPTION and is used to populate the name of the source port.
3. The method for querying DNS according to claim 1 or 2, wherein the constructing a new DHCP OPTION according to the source port of the message is specifically: the DHCP DISCOVERY or DHCP REQUEST message is modified on the INPUT chain of the filter table of ebtables of the kernel layer or BROUTING chain of broute table, and the DHCP OPTION containing the source port is added.
4. The multi-service channel DNS query method based on port binding according to claim 1 or 2, wherein the DNS SERVER for finding out the port binding specifically is: and analyzing DNS SERVER corresponding to the DHCP operation source port, and selecting DNS SERVER of the internet surfing service as a default DNS SERVER if the port-containing DHCP operation is not analyzed.
5. The port binding based multi-service channel DNS query method according to claim 1 or 2, wherein the storage file is generated in the following manner: the method comprises the steps of configuring service channel connection of local WEB configuration equipment remotely or designating the binding relation between the service channel connection and a port; when the equipment is started, the service channel acquires an IP address through DHCP or PPPOE, and then acquires DNS SERVER addresses of the corresponding service channel; and storing the mapping relation between DNS SERVER and ports of the service channel to a storage file.
6. The port binding-based multi-service channel DNS query device is characterized by comprising a DNS binding module, a DHCP marking module and a DHCP service module, wherein:
The DNS binding module is used for updating the binding relation between DNS SERVER and the physical port of each service channel when the service channel configuration or the state of the gateway changes, and recording the binding relation into a storage file;
The DHCP marking module is used for constructing a new DHCP OPTION according to a source port of the message by the kernel layer when receiving a DHCP DISCOVERY or DHCP REQUEST REQUEST, and attaching the new DHCP OPTION to the last of the original DHCP OPTION message;
The DHCP service module is used for analyzing the DHCP OPTION of the message after the DHCP request message reaches the application layer to obtain a source port of the message, searching a binding relation storage file and searching DNS SERVER bound by the port; and filling DNS SERVER into the DHCP OFFER response message, and returning to the LAN side equipment.
7. The port binding based multi-service channel DNS query device according to claim 6, wherein the DHCP OPTION includes the following fields:
code: representing the OPTION type;
Len: representing the length of value;
Value: is the value of OPTION and is used to populate the name of the source port.
8. The port binding based multi-service channel DNS query device according to claim 6 or 7, wherein the constructing a new DHCP OPTION according to the source port of the message is specifically: the DHCP DISCOVERY or DHCP REQUEST message is modified on the INPUT chain of the filter table of ebtables of the kernel layer or BROUTING chain of broute table, and the DHCP OPTION containing the source port is added.
9. The port binding based multi-service channel DNS query device according to claim 6 or 7, wherein the DNS SERVER for finding out the port binding is specifically: and analyzing DNS SERVER corresponding to the DHCP operation source port, and selecting DNS SERVER of the internet surfing service as a default DNS SERVER if the port-containing DHCP operation is not analyzed.
10. The port binding based multi-service channel DNS query device according to claim 6 or 7, wherein the means for generating the storage file is: the method comprises the steps of configuring service channel connection of local WEB configuration equipment remotely or designating the binding relation between the service channel connection and a port; when the equipment is started, the service channel acquires an IP address through DHCP or PPPOE, and then acquires DNS SERVER addresses of the corresponding service channel; and storing the mapping relation between DNS SERVER and ports of the service channel to a storage file.
CN202410007806.7A 2024-01-02 2024-01-02 Multi-service channel DNS query method and device based on port binding Pending CN118018513A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202410007806.7A CN118018513A (en) 2024-01-02 2024-01-02 Multi-service channel DNS query method and device based on port binding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202410007806.7A CN118018513A (en) 2024-01-02 2024-01-02 Multi-service channel DNS query method and device based on port binding

Publications (1)

Publication Number Publication Date
CN118018513A true CN118018513A (en) 2024-05-10

Family

ID=90951024

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202410007806.7A Pending CN118018513A (en) 2024-01-02 2024-01-02 Multi-service channel DNS query method and device based on port binding

Country Status (1)

Country Link
CN (1) CN118018513A (en)

Similar Documents

Publication Publication Date Title
US8559448B2 (en) Method and apparatus for communication of data packets between local networks
US9787503B2 (en) Utilizing proxy internet protocol addressing in a gateway for communicating with multiple service provider networks
EP2239890B1 (en) Remote access method in a network comprising a nat device
US20070214232A1 (en) System for Uniform Addressing of Home Resources Regardless of Remote Clients Network Location
JP2005244408A (en) Gateway apparatus connected to plurality of networks with different network segments, and program and method for transferring ip packet
US20100217847A1 (en) System, method and apparatus for media access control (mac) address proxying
US20090313357A1 (en) Method for establishing connection between user-network of other technology and domain name system proxy server for controlling the same
CN103460676A (en) Flow routing protocol by querying a remote server
US9697173B2 (en) DNS proxy service for multi-core platforms
EP1187426B1 (en) Method for using a unique IP address in a private IP address domain
US7440466B2 (en) Method, apparatus and system for accessing multiple nodes on a private network
CN113630480B (en) Method for realizing DNS data isolation of multiple internet surfing channels
US20050271047A1 (en) Method and system for managing multiple overlapping address domains
EP2656590B1 (en) DNS forwarder for multi-core platforms
US20100023620A1 (en) Access controller
US9705794B2 (en) Discovery of network address allocations and translations in wireless communication systems
CN101803343B (en) Identifying subnet address range from DNS information
CN118018513A (en) Multi-service channel DNS query method and device based on port binding
JP4013967B2 (en) Name resolution server and packet transfer device
US20060002384A1 (en) Network system and connecting method thereof
CN117834585A (en) Multi-service channel DNS forwarding method and device based on port binding
KR100397091B1 (en) NETWORK ACCESS DEVICE FOR SUPPORTING VoIP AND METHOD THEREOF
KR20010073827A (en) Method for expanding address for internet protocol version 4 in internet edge router
JP4269343B2 (en) Name resolution server and packet transfer device
KR100586428B1 (en) Method to redirect of web page for internet service management

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination