CN102143164B - Message relaying method, message relaying device and base station - Google Patents
Message relaying method, message relaying device and base station Download PDFInfo
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- CN102143164B CN102143164B CN201110025619.4A CN201110025619A CN102143164B CN 102143164 B CN102143164 B CN 102143164B CN 201110025619 A CN201110025619 A CN 201110025619A CN 102143164 B CN102143164 B CN 102143164B
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Abstract
The invention discloses a message relaying method, a message relaying device and a base station. The message relaying method comprises the following steps: the base station is configured as a relaying base station; the relaying base station is used to forward a DHCP (dynamic host configuration protocol) message between a DHCP server and a client-side device. The technical scheme provided by the invention solves the problem in the prior art that when a DHCP client side and a DHCP server end are in different subnetworks or VLANs, the client-side device cannot acquire an IP address for configuration through the DHCP message because the router for connecting the DHCP client side and the DHCP server does not support the Relay function or disallows to set the Relay function, so that the client-side device can acquire the IP address for configuration through the DHCP message, and the user experience is effectively improved.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of message relay method, device and base station.
Background technology
The predecessor of DHCP (Dynamic Host Configuration Protocol, referred to as DHCP) is BOOTP agreement.The running of agreement is divided into two ends: server end (DHCP Server) and client (DHCP Client).Client configures to server end request by sending DHCP message, after server receives message, the configuration distributing to client is sent to client by response message, and these configuration parameters can include but not limited to: the information such as IP address, subnet mask and gateway.
VLAN (Virtual Local Area Network, referred to as VLAN) be a kind of technology physical network being divided into multiple logical local network (LAN), each VLAN has LAN ID symbol (VLAN ID).Utilize vlan technology, network manager can according to practical application needs, user logic in Same Physical local area network (LAN) is divided into different broadcast domains (the corresponding broadcast domain of each VLAN), makes the user with identical services be in same broadcast domain.Each VLAN logically just as an independently local area network (LAN), has identical attribute with LAN physically.All broadcast in same VLAN and unicast traffic are all limited in this VLAN and can not be forwarded in other VLAN.When the equipment of different VLAN will communicate, have to pass through the routing forwarding of three layers.
If in network topology, when dhcp client is in different subnets from Dynamic Host Configuration Protocol server end, and the router connecting dhcp client and server end does not support DHCP Relay or when not allowing to configure Relay function, so the broadcasting packet of client just cannot arrive server end by router, and client just cannot obtain IP address configuration information by DHCP agreement.
If in network topology, when dhcp client is in different VLAN from Dynamic Host Configuration Protocol server end, and the router connecting client and server does not support DHCP relay (Relay) or when not allowing configuration Relay function, client also cannot obtain IP address configuration by DHCP agreement.
Summary of the invention
For in correlation technique when dhcp client is in different subnets or VLAN from Dynamic Host Configuration Protocol server end, because the router connecting dhcp client and Dynamic Host Configuration Protocol server is not supported Relay function or do not allow to configure Relay function, cause client device cannot be obtained the problem of IP address configuration by DHCP message, the invention provides a kind of message relay method, device and base station, to solve the problem one of at least.
According to an aspect of the present invention, a kind of message relay method is provided.
Message relay method according to the present invention comprises: configure a base station as relay base station; The relay base station of configuration is adopted to E-Packet between Dynamic Host Configuration Protocol server and client device.
According to a further aspect in the invention, a kind of message relay device is provided.
Message relay device according to the present invention comprises: configuration module, for configuring relay function; Trunk module, E-Packets between Dynamic Host Configuration Protocol server and client device for adopting relay function.
According to another aspect of the invention, a kind of base station is provided.
Base station according to the present invention comprises: above-mentioned message relay device.
Pass through the present invention, adopt the DHCP message that a base station is come between relay client equipment and Dynamic Host Configuration Protocol server, to solve in correlation technique when dhcp client is in different subnets or VLAN from Dynamic Host Configuration Protocol server end, because the router connecting dhcp client and Dynamic Host Configuration Protocol server is not supported Relay function or do not allow to configure Relay function, cause client device cannot be obtained the problem of IP address configuration by DHCP message, and then make client device obtain IP address configuration by DHCP message, effectively improve Consumer's Experience.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the Organization Chart of the system residing for the relay base station of the embodiment of the present invention;
Fig. 2 is the flow chart of the message relay method according to the embodiment of the present invention;
Fig. 3 is the flow chart of relay base station relaying dhcp client message according to the preferred embodiment of the invention;
Fig. 4 is the flow chart of relay base station relaying Dynamic Host Configuration Protocol server end message according to the preferred embodiment of the invention;
Fig. 5 is that relay base station builds the flow chart of MAC-VLAN corresponding relation according to the preferred embodiment of the invention;
Fig. 6 is the structured flowchart of the message relay device according to the embodiment of the present invention;
Fig. 7 is the structured flowchart of message relay device according to the preferred embodiment of the invention.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Fig. 1 is the Organization Chart of the system residing for the relay base station of the embodiment of the present invention.As shown in Figure 1, this system mainly comprises: Dynamic Host Configuration Protocol server (Server), BSC, client device (base station (Base Transceiver Station, referred to as BTS) 1, BTS 2), relay base station (DHCP Relay) and router and switch.
As shown in Figure 1, as base station sub-system (Base Station Systems, referred to as BSS) network element client device (BTS1 or BTS 2) from when being in different subnets or different VLAN between DHCP Server, DHCP Server cannot receive the broadcasting packet of client device, and so BTS just cannot obtain network ip address configuration by DHCP message.
But the relay base station (DHCP Relay) of employing shown in Fig. 1 leads to come the DHCP message between relay client equipment and Dynamic Host Configuration Protocol server, BTS can be made to obtain network ip address configuration by DHCP message.Be described below in conjunction with Fig. 2.
Fig. 2 is the flow chart of the message relay method according to the embodiment of the present invention.As shown in Figure 2, this message relay method comprises following process:
Step S202: configure a base station as relay base station;
Wherein, be that route can reach between this relay base station and Dynamic Host Configuration Protocol server.
Step S204: adopt the relay base station of configuration to E-Packet between DHCP (DHCP) server and client side equipment.
In the above-mentioned methods, adopt the message that a base station is come between relay client equipment and Dynamic Host Configuration Protocol server, solve in correlation technique because the router connecting dhcp client and Dynamic Host Configuration Protocol server is not supported Relay function or do not allow to configure Relay function, cause client device cannot be obtained the problem of IP address configuration by DHCP message, and then make client device obtain IP address configuration by DHCP message, effectively improve Consumer's Experience.
Wherein, configure a base station as relay base station, following process can be included but not limited to: open on certain interface or close DHCP Relay, the VLAN or all VLAN of this interface configuration forward DHCP message, the IP address of DHCPServer and the route to DHCP Server.
Preferably, in step S204, relay base station E-Packets and may further include following process between Dynamic Host Configuration Protocol server and client device:
(1) relay base station receives the first message coming from client device, and wherein, the first message carries the MAC Address of client device;
(2) VLAN of relay base station study residing for client device;
(3) VLAN of relay base station residing for the MAC Address of carrying in the first message and client device builds corresponding relation;
(4) relay base station builds new message and is sent to Dynamic Host Configuration Protocol server, wherein, is filled with the IP address information of relay base station in this message.
Below in conjunction with Fig. 3, above-mentioned preferred implementation is described.
Fig. 3 is the flow chart of relay base station relaying dhcp client message according to the preferred embodiment of the invention.As shown in Figure 3, relay base station relaying dhcp client message may further include following process:
Step S302: from the message of UDP No. 67 port accepts client devices;
Step S304: judge whether the type of message in UDP message is Bootp Request, if so, performs step S306, otherwise, perform step S314;
Step S306: determine to enter dhcp client message relay handling process;
Step S308: judge that whether this message is legal according to Hop and the Sec field of message, if so, perform step S310, otherwise flow process terminates;
Step S310: learn the VLAN residing for this client device;
In specific implementation process, relay base station VLAN residing for the MAC Address of carrying in above-mentioned message and client device can build the corresponding relation of MAC-VLAN.
Step S312: a new DHCP message of structure, the user load of direct copying original message also by new message repeating to DHCP Server, wherein, is filled with the IP address information of relay base station in this message.
Step S314: judge whether the type of message in UDP message is Bootp Reply, if so, perform step S316, otherwise flow process terminates;
Step S316: determine to enter Dynamic Host Configuration Protocol server end message relay handling process.
Preferably, in step S204, relay base station E-Packets and may further include following process between Dynamic Host Configuration Protocol server and client device:
(1) relay base station receives the second message coming from dynamic host configuration protocol DHCP server, and wherein, the second message carries the MAC address of client device;
(2) relay base station searches the VLAN corresponding with the MAC Address of client device in corresponding relation;
(3) relay base station builds new message and is sent to client device, wherein, is filled with corresponding VLAN in this message.
Below in conjunction with Fig. 4, above-mentioned preferred implementation is described.
Fig. 4 is the flow chart of relay base station relaying Dynamic Host Configuration Protocol server end message according to the preferred embodiment of the invention.As shown in Figure 4, this relay base station relaying Dynamic Host Configuration Protocol server end message mainly comprises following process:
Step S402: from the message of UDP No. 67 port accepts Dynamic Host Configuration Protocol server;
Step S404: judge whether the type of message in UDP message is Bootp Request, if so, performs step S406, otherwise, perform step S422;
Step S406: determine to enter Dynamic Host Configuration Protocol server end message relay handling process;
Step S408: judge that whether this message is legal according to Hop and the Sec field of message, if so, perform step S410, otherwise flow process terminates;
Step S410: the original vlan being searched this dhcp client equipment by the MAC Address of the client device carried in message, if can find, then perform step S412, otherwise directly abandon this message, flow process terminates;
Step S412: the DHCP message that structure is a new;
Step S414: judge that whether the original vlan of client device is effective, if so, perform step S416, otherwise, perform step S418;
Step S416: the original vlan of filling client in the MAC head of message, afterwards, performs step S420;
Step S418: the original vlan of filling client in the MAC head of message, afterwards, performs step S420;
Step S420: send this new DHCP message to client device.
Step S422: judge whether the type of message in UDP message is Bootp Request, if so, perform step S424, otherwise flow process terminates;
Step S424: determine to enter dhcp client message relay handling process.
From Fig. 3 and Fig. 4, after relay base station receives message, following process can also be comprised:
(1) relay base station is determined to E-Packet to client device or Dynamic Host Configuration Protocol server according to the type of the message received, that is, enter dhcp client message relay handling process or enter Dynamic Host Configuration Protocol server message relay handling process.
(2) relay base station judges the legitimacy of this message according to the field of the message received, if illegal, then directly abandons this message.
Operated by validity decision, effectively can strengthen the fail safe of system.
Mention relay base station above and VLAN residing for the MAC Address of carrying in above-mentioned message and client device can build the corresponding relation of MAC-VLAN.Preferably, build after corresponding relation in relay base station, following process can also be comprised: the form that relay base station is shown with Hash (HASH) stores corresponding relation, wherein, in HASH table with the MAC Address of client device for major key.
Below in conjunction with Fig. 5, the preferred implementation that relay base station builds MAC-VLAN corresponding relation is described.
Fig. 5 is that relay base station builds the flow chart of MAC-VLAN corresponding relation according to the preferred embodiment of the invention.As shown in Figure 5, relay base station structure MAC-VLAN corresponding relation mainly comprises following process:
Step S502: from the message of UDP No. 67 port accepts dhcp client equipment;
Step S504: the MAC Address of the user in analytic message;
Step S506: the MAC Address for user calculates HASH index value;
Step S508: judge that whether this HASH index value is effective, if so, perform step S510, otherwise flow process terminates;
Step S510: the MAC Address of searching this user under the index that HASH table is corresponding;
Step S512: judge whether this MAC exists, if so, performs step S514, otherwise, perform step S516;
Step S514: the VLAN more in new record and timestamp;
Step S516: construct new corresponding relation, and this corresponding relation is added in HASH table.
In preferred implementation process, after relay base station stores above-mentioned corresponding relation, following process can also be comprised: judge whether the duration that in HASH table, corresponding relation does not occur to upgrade exceedes threshold value one by one; If the duration that a corresponding relation in corresponding relation does not occur to upgrade exceedes threshold value, then delete this corresponding relation.
Such as, can arrange HASH table time-out and detect timer, HASH table time-out detects the operation of timer expiry with regard to detection trigger HASH entry whether time-out.If Hash table, for empty, just directly exits testing process; Otherwise all entries (i.e. corresponding relation) in showing with regard to searching loop Hash, judge that whether the duration that corresponding relation does not occur to upgrade is overtime one by one, if time-out just deletes this node, if skip this node without time-out and judge next node until complete traversal Hash table.
By above-mentioned process, can effectively reduce information storage unnecessary in relay base station internal memory, thus save system resource.
Preferably, the first message is that DHCP finds message, and the second message provides message for DHCP; Or the first message is DHCP request message, the second message is dhcp response message.
Below in conjunction with an above-mentioned preferred implementation of example.
Example
First configure a base station by manual mode and allow this base station and BSC connect on network, then this base station being used as DHCP RelayAgent (i.e. above-mentioned relay base station) and running on network.
The IP address of DHCP Server is not known, so find DHCP Server by the mode of the DHCP Discovery message sending broadcast during client terminal start-up.
Receive after DHCP finds (Discovery) message as the base station (i.e. relay base station) of Relay, VLAN residing for first this dhcp client of automatic learning is also kept in internal memory, then a new DHCP message is built, fill the Hop field in the IP address of DHCPRelayAgent, amendment message, message is sent to DHCP Server (server).
After DHCP Server receives this message, provide (Offer) message to DHCP Relay reply DHCP.After DHCPRelay receives this message, search the VLAN residing for client according to the MAC Address of the client in message load, if found, just this VLAN is filled in MAC head, and send to client device by the mode of broadcast.If do not found, directly abandon this message.
After client receives the DHCP offer message of server acknowledge, send broadcast DHCP request (Request) message, this message of relaying is continued according to the mode of process DHCP Discovery message in the base station of Relay, and this message is sent to DHCPServer.
When DHCP Server sends dhcp response (ACK) message to client and after client receives this message, client just can obtain IP address configuration, the DHCP data of subsequent client and server end is all unicast message, can be transmitted by router.The work of Relay completes at this point.
It should be noted that in above-mentioned processing procedure, if client device can provide (Offer) Receive message IP address configuration according to DHCP, then client device is without the need to broadcast DHCP request (Request) message, and flow process leaves it at that.
Fig. 6 is the structured flowchart of the message relay device according to the embodiment of the present invention.As shown in Figure 6, this message relay device comprises:
Configuration module 60, for configuring relay function;
Trunk module 62, is connected with configuration module 60, E-Packets between Dynamic Host Configuration Protocol server and client device for adopting above-mentioned relay function.
DHCP message between the trunk module relay client equipment of said apparatus and Dynamic Host Configuration Protocol server, solve in correlation technique because the router connecting dhcp client and Dynamic Host Configuration Protocol server is not supported Relay function or do not allow to configure Relay function, cause client device cannot be obtained the problem of IP address configuration by DHCP message, and then make client device obtain IP address configuration by DHCP message, effectively improve Consumer's Experience.
Preferably, as shown in Figure 7, trunk module 62 may further include: the first receiving element 620, and for receiving the first message coming from client device, wherein, the first message carries the MAC Address of client device; Unit 622, for learning the VLAN residing for client device; Construction unit 624, is connected with unit 622 with the first receiving element 620 respectively, builds corresponding relation for the VLAN residing for the MAC Address of carrying in the first message and client device; First transmitting element 626, is connected with construction unit 624, for building new message and being sent to Dynamic Host Configuration Protocol server, wherein, is filled with the IP address information of relay base station in this message.
Preferably, as shown in Figure 7, above-mentioned trunk module also comprises: memory cell 634, is connected with construction unit 624, stores corresponding relation for the form shown with HASH, wherein, in HASH table with the MAC Address of client device for major key.Judging unit 636, is connected with memory cell 634, for judging whether the duration that in HASH table, corresponding relation does not occur to upgrade exceedes threshold value one by one; Processing unit 638, is connected with judging unit 636, for the corresponding relation of in corresponding relation do not occur upgrade duration exceed threshold value time, delete this corresponding relation.
Preferably, as shown in Figure 7, trunk module 62 may further include: the second receiving element 628, and for receiving the second message coming from Dynamic Host Configuration Protocol server, wherein, the second message carries the MAC address of client device; Search unit 630, be connected with memory cell 634, for searching the virtual LAN VLAN corresponding with the MAC Address of client device in the MAC Address of above-mentioned structure and the corresponding relation of VLAN; Second transmitting element 632, and searches unit 630 and is connected, and for building new message and being sent to client device, wherein, is filled with corresponding VLAN in new message.
Preferably, as shown in Figure 7, above-mentioned trunk module also comprises: determining unit 640, is connected respectively with the first receiving element 620 with the second receiving element 628, for determining to E-Packet to client device or Dynamic Host Configuration Protocol server according to the type of the message received; Validity decision unit 642, is connected with determining unit 640, for judging the legitimacy of this message according to the field of the message received.
Preferably, above-mentioned first message is that DHCP finds message, and above-mentioned second message provides message for DHCP; Or above-mentioned first message is DHCP request message, above-mentioned second message is dhcp response message.
It should be noted that preferred implementation that in above-mentioned message relay device, each module and each unit be combined with each other specifically see the description of Fig. 2 to Fig. 5 and above-mentioned example, can repeat no more herein.
In preferred implementation process, any one message relay device above-mentioned can be arranged in a base station.
In sum, by above-described embodiment provided by the invention, when base station system and server end are in different subnets or different VLAN, another one base station is used to carry out the mode of broadcast DHCP message between relay client and server end and self study client original vlan, make client pass through to use DHCP agreement to obtain configuration, effectively improve Consumer's Experience.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a message relay method, is characterized in that, comprising:
Configure a base station as relay base station;
The relay base station of described configuration is adopted to E-Packet between dynamic host configuration protocol DHCP server and client side equipment;
Wherein, described relay base station E-Packets and comprises between described Dynamic Host Configuration Protocol server and client device:
Described relay base station receives the first message coming from described client device, and wherein, described first message carries the MAC Address of described client device; Described relay base station learns the VLAN residing for described client device; The VLAN of described relay base station residing for the MAC Address of carrying in described first message and described client device builds corresponding relation; Described relay base station builds new message and is sent to described Dynamic Host Configuration Protocol server, wherein, is filled with the IP address information of described relay base station in this message;
Relay base station receives the second message coming from dynamic host configuration protocol DHCP server, and wherein, described second message carries the MAC address of client device; Described relay base station searches the VLAN corresponding with the MAC Address of described client device in described corresponding relation; Described relay base station builds new message and is sent to described client device, wherein, is filled with the VLAN of described correspondence in this message.
2. method according to claim 1, it is characterized in that, described relay base station also comprises after building described corresponding relation: the form that described relay base station is shown with Hash HASH stores described corresponding relation, wherein, in described HASH table with the MAC Address of described client device for major key.
3. method according to claim 2, is characterized in that, described relay base station also comprises after storing described corresponding relation:
Judge whether the duration that described in described HASH table, corresponding relation does not occur to upgrade exceedes threshold value one by one;
If the duration that a corresponding relation in described corresponding relation does not occur to upgrade exceedes threshold value, then delete this corresponding relation.
4. method according to claim 1, is characterized in that, after described relay base station receives described first message or described second message, also comprises:
Described relay base station is determined to E-Packet to described client device or described Dynamic Host Configuration Protocol server according to the type of the message received;
Described relay base station according to described in the field of message that receives judge the legitimacy of this message.
5. the method according to claim 1 or 4, is characterized in that,
Described first message is that DHCP finds message, and described second message provides message for DHCP; Or
Described first message is DHCP request message, and described second message is dhcp response message.
6. a message relay device, is characterized in that, comprising:
Configuration module, for configuring relay function;
Trunk module, E-Packets between dynamic host configuration protocol DHCP server and client side equipment for adopting described relay function;
Wherein, the first receiving element, for receiving the first message coming from described client device, wherein, described first message carries the MAC Address of described client device; Unit, for learning the VLAN residing for described client device; Construction unit, builds corresponding relation for the VLAN residing for the MAC Address of carrying in described first message and described client device; First transmitting element, for building new message and being sent to described Dynamic Host Configuration Protocol server, wherein, is filled with the IP address information of described relay base station in this message; And
Second receiving element, for receiving the second message coming from described Dynamic Host Configuration Protocol server, wherein, described second message carries the MAC address of client device; Search unit, for searching the virtual LAN VLAN corresponding with the MAC Address of described client device in described corresponding relation; Second transmitting element, for building new message and being sent to described client device, wherein, is filled with the VLAN of described correspondence in described new message.
7. device according to claim 6, is characterized in that, described trunk module also comprises:
Memory cell, the form for showing with HASH stores described corresponding relation, wherein, in described HASH table with the MAC Address of described client device for major key;
Judging unit, for judging whether the duration that described in described HASH table, corresponding relation does not occur to upgrade exceedes threshold value one by one;
Processing unit, for the corresponding relation of in described corresponding relation do not occur upgrade duration exceed threshold value time, delete this corresponding relation.
8. device according to claim 6, is characterized in that, described trunk module also comprises:
Determining unit, for determining to E-Packet to described client device or described Dynamic Host Configuration Protocol server according to the type of the message received;
Validity decision unit, the field for the message received described in basis judges the legitimacy of this message.
9. a base station, is characterized in that, described base station comprises: the message relay device according to any one of claim 6 to 8.
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| CN201110025619.4A CN102143164B (en) | 2011-01-24 | 2011-01-24 | Message relaying method, message relaying device and base station |
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| CN103874059B (en) | 2012-12-10 | 2018-06-05 | 华为终端（东莞）有限公司 | Message processing method and device, system |
| CN104253878B (en) * | 2014-09-09 | 2018-04-17 | 烽火通信科技股份有限公司 | The vlan information management system and method for DHCP RELAY termination sub-interfaces |
| CN105471615A (en) * | 2014-09-12 | 2016-04-06 | 中兴通讯股份有限公司 | Processing method and device of dynamic host configuration protocol (DHCP) information abnormality |
| JP6479173B2 (en) * | 2014-09-25 | 2019-03-06 | シーメンス アクチエンゲゼルシヤフトＳｉｅｍｅｎｓ Ａｋｔｉｅｎｇｅｓｅｌｌｓｃｈａｆｔ | SYSTEM FOR CONTROLLING PROCESS AND METHOD OF OPERATING SERVER EQUIPMENT IN THE SYSTEM |
| CN105991784B (en) * | 2015-02-06 | 2019-04-05 | 普天信息技术有限公司 | Mine base station automatic configuration system and method |
| CN106231616B (en) * | 2016-06-28 | 2019-11-22 | 上海斐讯数据通信技术有限公司 | A kind of method and wireless router configuring wireless relay |
| CN106878481B (en) * | 2016-12-30 | 2020-08-18 | 瑞斯康达科技发展股份有限公司 | Method, device and system for acquiring Internet Protocol (IP) address |
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| CN101150517A (en) * | 2007-10-25 | 2008-03-26 | 杭州华三通信技术有限公司 | Packet transmission method and device |
| CN101771614A (en) * | 2010-01-15 | 2010-07-07 | 瑞斯康达科技发展股份有限公司 | DHCP route tracing method and DHCP relay equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101150517A (en) * | 2007-10-25 | 2008-03-26 | 杭州华三通信技术有限公司 | Packet transmission method and device |
| CN101771614A (en) * | 2010-01-15 | 2010-07-07 | 瑞斯康达科技发展股份有限公司 | DHCP route tracing method and DHCP relay equipment |
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