CN109150766A - The method and apparatus of dynamic addressing server in local area network based on UDP multicast - Google Patents
The method and apparatus of dynamic addressing server in local area network based on UDP multicast Download PDFInfo
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- CN109150766A CN109150766A CN201811219819.1A CN201811219819A CN109150766A CN 109150766 A CN109150766 A CN 109150766A CN 201811219819 A CN201811219819 A CN 201811219819A CN 109150766 A CN109150766 A CN 109150766A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/20—Support for services
- H04L49/201—Multicast operation; Broadcast operation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
- H04L67/141—Setup of application sessions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
- H04L69/164—Adaptation or special uses of UDP protocol
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention discloses a kind of method and apparatus of dynamic addressing server in local area network based on UDP multicast, include the following steps: S5: client sends the first UDP packet to local area network multicast domain and UDP multicast port, and the first UDP packet includes: client ip and UDP unicast port numbers；S6: server-side receives the first UDP packet；S7: server-side sends the 2nd UDP packet to client ip and UDP unicast port, and the 2nd UDP packet includes: server-side IP and service port number；S8: client receives the 2nd UDP packet；S9: client is carried out within n times by HTTP or Transmission Control Protocol with server-side and connects, and N is positive integer；S10: judge whether successful connection；If it fails to connect, then return step S5；If successful connection thens follow the steps S11: client is closed to UDP unicast port snoop, and leaves local area network multicast domain.Client can obtain server-side IP and service port number automatically, connect server-side automatically.
Description
Technical field
The present invention relates to UDP technical field of multicast, more particularly, to dynamic in a kind of local area network based on UDP multicast
The method and apparatus of addressable server.
Background technique
After the publication of local area network CS (client-server) software product, local area network deployment is essential link, especially
It is the software product of multiple client (including pc client, cell phone client, Pad client etc.).
In local area network deployment software product, since network limits, the often server-side IP and server-side of each local area network
Slogan can all change, and this uncertainty can bring extra workload to software implementation personnel.Software implementation at this stage
Personnel often first need to set up server-side when disposing LAN software product, after the completion of erection determine server-side IP and
Then service port number is manually arranged server-side IP and service port number in client and server-side is attached.
In the case where client is less, the workload of software implementation personnel is not counting very big, but if there is same office
When there are many client terminal quantity in the net of domain, it is necessary to which software implementation personnel successively configure each client, give software implementation
Personnel bring very big additional workload.
Summary of the invention
In view of this, the present invention provides a kind of method of dynamic addressing server in local area network based on UDP multicast and
Device, to solve problem of the prior art.
The present invention provides a kind of methods of dynamic addressing server in local area network based on UDP multicast, including walk as follows
It is rapid:
S1: local area network multicast domain is added in server-side；
S2: server-side monitors UDP multicast port；
S3: local area network multicast domain is added in client；
S4: client monitors UDP unicast port；
S5: client sends the first UDP packet to local area network multicast domain and UDP multicast port, and the first UDP packet includes: client
Hold IP and UDP unicast port numbers；
S6: server-side receive the first UDP packet, according to protocol massages format parse the first UDP packet with obtain client ip with
UDP unicast port numbers；
S7: server-side sends the 2nd UDP packet to client ip and UDP unicast port, and the 2nd UDP packet includes: server-side IP
And service port number；
S8: client receive the 2nd UDP packet, according to protocol massages format parse the 2nd UDP packet with obtain server-side IP with
Service port number；
S9: client is carried out within n times by HTTP or Transmission Control Protocol with server-side and connects, and N is positive integer；
S10: judge whether successful connection；
If it fails to connect, then return step S5；
If successful connection thens follow the steps S11: client is closed to UDP unicast port snoop, and leaves local area network group
Broadcast domain.
Preferably, step S8 further include: by server-side IP and service port number storage into the local file of client.
Preferably, when the connection of client and server-side disconnects, following steps are executed:
S01: client reads server-side IP and service port number in local file；
Execute step S9.
Preferably, UDP multicast port includes UDP multicast conventional port and UDP multicast standby port, the spare end of UDP multicast
The quantity of mouth is 1-5；
Step S2 is further are as follows: server-side monitors UDP multicast conventional port, if UDP multicast conventional port quilt
It occupies, then server-side monitors UDP multicast standby port.
Preferably, further include following steps after step S7:
S71: judge whether client receives the 2nd UDP packet in preset time T；
If received, step S8 is executed；
If confiscated, step S72 is executed,
S72: UDP multicast conventional port is replaced with into UDP multicast standby port；Then step S5 is executed.
The present invention also provides a kind of devices of dynamic addressing server in local area network based on UDP multicast, comprising:
Server-side, client, network access device；
Server-side monitoring unit, for monitoring UDP multicast port；
Client monitoring unit, for monitoring UDP unicast port；
Client transmission unit, for sending the first UDP packet, the first UDP to UDP multicast port by network access device
Packet includes: client ip and UDP unicast port numbers；
Server-side receiving unit parses the first UDP packet according to protocol massages format for receiving the first UDP packet to obtain
Client ip and UDP unicast port numbers；
Server-side transmission unit, for sending the 2nd UDP packet, the 2nd UDP to UDP unicast port by network access device
Packet includes: server-side IP and service port number；
Client receiving unit parses the 2nd UDP packet according to protocol massages format for receiving the 2nd UDP packet to obtain
Server-side IP and service port number；
Connection unit is connected for client to be carried out within n times by HTTP or Transmission Control Protocol with server-side, and N is positive
Integer；
Judging unit, for judging whether successful connection；
If it fails to connect, then client transmission unit is sent again through network access device to office's UDP multicast port
First UDP packet；
If successful connection, client monitoring unit is closed to UDP unicast port snoop.
Preferably, client receiving unit includes: client storage unit, is obtained for parsing client receiving unit
Server-side IP and service port number store into local file.
Preferably, further includes: whether monitoring unit, the connection for monitoring client and server-side disconnect；
If connection disconnects, connection unit reads server-side IP and service port number in local file, by client and
Server-side re-connects.
Preferably, UDP multicast port includes UDP multicast conventional port and UDP multicast standby port, the spare end of UDP multicast
The quantity of mouth is 1-5.
Preferably, network access device includes: router and interchanger.
Compared with prior art, in the local area network provided by the invention based on UDP multicast dynamic addressing server method
And device, at least realize it is following the utility model has the advantages that
1, client can obtain server-side IP and service port number automatically, and client is made to connect server-side automatically.To
Need not move through software implementation personnel depaly server-side IP and service port number, it is possible to reduce the work of software implementation personnel is promoted
The joint efficiency of client and server-side.
2, when the change of later period network environment causes server-side IP and service port number to change, client can obtain automatically again
Server-side IP and service port number are taken, client is made to restore the connection with server-side.To be further reduced software implementation personnel
Work, promote the stability of the connection of client and server-side.
3, client is by server-side IP and service port number storage into the local file of client；When client and service
When the connection at end disconnects, client reads server-side IP and service port number in local file, can quickly obtain service
IP and service port number are held, connects client and server-side automatically again.
4, the number that client and server-side are attached is preset as n times, if it fails to connect, then client is mono- to UDP
It broadcasts port and re-starts monitoring.When the change of later period network environment causes server-side IP and service port number to change, client can be with
It obtains server-side IP and service port number automatically again again, client is made to restore the connection with server-side.To further subtract
The work of few software implementation personnel, promotes the stability of the connection of client and server-side.
5, UDP multicast port includes UDP multicast conventional port and UDP multicast standby port, the number of UDP multicast standby port
Amount is 1-5, and server-side monitors UDP multicast conventional port, if UDP multicast conventional port is occupied, services
End is monitored by UDP multicast standby port.The particular number of UDP multicast standby port can according to specific business demand into
Row setting, to be further ensured that reliability that client is connected with server-side.
6, after client sends the first UDP packet to local area network multicast domain and UDP multicast port, in preset time T, if
Client does not receive the 2nd UDP packet, then client sends the first UDP packet to UDP multicast standby port, so as to further
Guarantee the reliability that client is connected with server-side.
Certainly, implementing any of the products of the present invention specific needs while must not reach all the above technical effect.
By referring to the drawings to the detailed description of exemplary embodiment of the present invention, other feature of the invention and its
Advantage will become apparent.
Detailed description of the invention
It is combined in the description and the attached drawing for constituting part of specification shows the embodiment of the present invention, and even
With its explanation together principle for explaining the present invention.
Fig. 1 is the method for dynamic addressing server in a kind of local area network based on UDP multicast provided in an embodiment of the present invention
Flow chart；
Fig. 2 is the side of dynamic addressing server in another local area network based on UDP multicast provided in an embodiment of the present invention
Method flow chart；
Fig. 3 is the device of dynamic addressing server in a kind of local area network based on UDP multicast provided in an embodiment of the present invention
Structure chart；
Specific embodiment
Carry out the various exemplary embodiments of detailed description of the present invention now with reference to attached drawing.It should also be noted that unless in addition having
Body explanation, the unlimited system of component and the positioned opposite of step, numerical expression and the numerical value otherwise illustrated in these embodiments is originally
The range of invention.
Be to the description only actually of at least one exemplary embodiment below it is illustrative, never as to the present invention
And its application or any restrictions used.
Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable
In the case of, the technology, method and apparatus should be considered as part of specification.
It is shown here and discuss all examples in, any occurrence should be construed as merely illustratively, without
It is as limitation.Therefore, other examples of exemplary embodiment can have different values.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, then in subsequent attached drawing does not need that it is further discussed.
Embodiment 1
Referring to FIG. 1, present embodiments providing a kind of side of dynamic addressing server in the local area network based on UDP multicast
Method, comprising:
Step S1: local area network multicast domain is added in server-side；
Step S2: server-side monitors UDP multicast port；
Step S3: local area network multicast domain is added in client；
Step S4: client monitors UDP unicast port；
Step S5: client sends the first UDP packet to local area network multicast domain and UDP multicast port, and the first UDP packet includes:
Client ip and UDP unicast port numbers；
Step S6: server-side receives the first UDP packet, parses the first UDP packet according to protocol massages format to obtain client
IP and UDP unicast port numbers；
Step S7: server-side sends the 2nd UDP packet to client ip and UDP unicast port, and the 2nd UDP packet includes: service
Hold IP and service port number；
Step S8: client receives the 2nd UDP packet, parses the 2nd UDP packet according to protocol massages format to obtain server-side
IP and service port number；
Step S9: client is carried out within n times by HTTP or Transmission Control Protocol with server-side and connects, and N is positive integer；
Step S10: judge whether successful connection；
If it fails to connect, then return step S5；
If successful connection thens follow the steps S11: client is closed to UDP unicast port snoop, and leaves local area network group
Broadcast domain.
The method for present embodiments providing dynamic addressing server in a kind of local area network based on UDP multicast is based on UDP group
Technology is broadcast, multicast is the communication mode of " one-to-one group " between host, that is, joined same group of host and can receive
All data in this group, interchanger and router in network are only to having demander to replicate and forward data needed for it.It is main
Machine can be added to router solicitation or exit some group, and the router and interchanger in network selectively replicate and transmit number
According to, i.e., will only organize in data be transferred to those and add enrolled host.Multiple in need (add can be once transferred data in this way
Enter group) host, and can guarantee the host for not influencing that other do not need and (group are not added) other communication.
In step s 5, it includes client ip and UDP unicast that client is sent to local area network multicast domain and UDP multicast port
First UDP packet of port numbers, the first UDP packet are packaged according to protocol massages format；In step s 6, server-side receives the first UDP
Packet, and the first UDP packet is parsed to obtain client ip and UDP unicast port numbers；In the step s 7, server-side to client ip and
UDP unicast port sends the 2nd UDP packet including server-side IP and service port number, and the 2nd UDP packet is according to protocol massages format
It is packaged；In step s 8, client receives the 2nd UDP packet, and parses the 2nd UDP packet to obtain server-side IP and serve port
Number, to realize that client can obtain server-side IP and service port number automatically, client is made to connect server-side automatically.
In step slo, judge whether successful connection, if it is judged that being "No", as connection failure then returns to step
Rapid S5, client send the first UDP packet to local area network multicast domain and UDP multicast port again, to obtain server-side IP again
And service port number.Server-side IP and service port number can be obtained automatically to further realize client, be further ensured that
Client can be successfully connected to server-side.
The method of dynamic addressing server, needs not move through software in local area network provided in this embodiment based on UDP multicast
Implement personnel depaly server-side IP and service port number, it is possible to reduce the work of software implementation personnel promotes client and service
The joint efficiency at end.
Embodiment 2
Referring to FIG. 2, present embodiments providing the side of dynamic addressing server in another local area network based on UDP multicast
Method, comprising:
Step S1: local area network multicast domain is added in server-side；
Step S2: server-side monitors UDP multicast conventional port, if UDP multicast conventional port is occupied, takes
Business end is monitored by UDP multicast standby port；Wherein, UDP multicast port includes that UDP multicast conventional port and UDP multicast are standby
With port, the quantity of UDP multicast standby port is 1-5；
Step S3: local area network multicast domain is added in client；
Step S4: client monitors UDP unicast port；
Step S5: client sends the first UDP packet to local area network multicast domain and UDP multicast port, and the first UDP packet includes:
Client ip and UDP unicast port numbers；
Step S6: server-side receives the first UDP packet, parses the first UDP packet according to protocol massages format to obtain client
IP and UDP unicast port numbers；
Step S7: server-side sends the 2nd UDP packet to client ip and UDP unicast port, and the 2nd UDP packet includes: service
Hold IP and service port number；
Step S71: judge whether client receives the 2nd UDP packet in preset time T；
If received, step S8 is executed；
If confiscated, step S72 is executed,
Step S72: UDP multicast conventional port is replaced with into UDP multicast standby port；Then step S5 is executed；
Step S8: client receives the 2nd UDP packet, parses the 2nd UDP packet according to protocol massages format to obtain server-side
IP and service port number；By server-side IP and service port number storage into the local file of client；
Step S9: client is carried out within n times by HTTP or Transmission Control Protocol with server-side and connects, and N is positive integer；
Step S10: judge whether successful connection；
If it fails to connect, then return step S5；
If successful connection thens follow the steps S11: client is closed to UDP unicast port snoop, and leaves local area network group
Broadcast domain.
In method provided in this embodiment, after the completion of connecting for the first time, if the subsequent company for monitoring client and server-side
When connecing disconnection, execute following steps: S01: client reads server-side IP and service port number in local file；Execute step
S9。
In step s 8, client is by server-side IP and service port number storage into the local file of client；Work as prison
When the connection of survey client and server-side disconnects, client can read server-side IP and service port number in local file,
It re-connects.To can quickly obtain server-side IP and server-side after the connection of client and server-side disconnects
Slogan connects client and server-side automatically again.
In the present embodiment, the number that client and server-side re-connect is preset as n times, client and server-side weight
It is new to carry out n times connection, if it fails to connect, then client re-starts monitoring to UDP unicast port；N is positive integer.Work as client
When the connection of end and server-side disconnects, client reads server-side IP and service port number in local file, client kimonos
Business end re-starts n times connection, if it fails, then return step S5, client retransmits the first UDP packet, again for n-th connection
It is new to obtain server-side IP and service port number.When the change of later period network environment causes server-side IP and service port number to change, visitor
Family end can obtain server-side IP and service port number automatically again again, and client is made to restore the connection with server-side.To
It is further reduced the work of software implementation personnel, promotes the stability of the connection of client and server-side.
In the present embodiment, UDP multicast port includes UDP multicast conventional port and UDP multicast standby port, and UDP multicast is standby
It is 1-5 with the quantity of port；Server-side monitor to UDP multicast port: server-side is normal to UDP multicast
Rule port is monitored, if UDP multicast conventional port is occupied, server-side monitors UDP multicast standby port.
UDP multicast conventional port and UDP multicast standby port need the agreement before product is issued, for example, UDP multicast standby port can be with
For 1,2,3,4,5, the particular number of UDP multicast standby port can be set according to specific business demand
It sets, to be further ensured that reliability that client is connected with server-side.
In the present embodiment, after client sends the first UDP packet to local area network multicast domain and UDP multicast port, when default
Between in T, if client does not receive the 2nd UDP packet, UDP multicast conventional port is replaced with into UDP multicast standby port, weight
It is new to execute step S5.For example, preset time T can be 30S, in 30S, if client does not receive the of server-side transmission
Two UDP packets, client do not receive the first UDP packet depending on server-side, then client sends the first UDP to UDP multicast standby port
Packet, return step S5.So as to be further ensured that reliability that client is connected with server-side.
Embodiment 3
Referring to FIG. 3, present embodiments providing a kind of dress of dynamic addressing server in the local area network based on UDP multicast
It sets, comprising:
Server-side 100, client 200, network access device 300；
Server-side monitoring unit 10, for monitoring UDP multicast port；
Client monitoring unit 20, for monitoring UDP unicast port；
Client transmission unit 30, for sending the first UDP packet to UDP multicast port by network access device 300, the
One UDP packet includes: client ip and UDP unicast port numbers；
Server-side receiving unit 40 parses the first UDP packet according to protocol massages format for receiving the first UDP packet to obtain
Obtain client ip and UDP unicast port numbers；
Server-side transmission unit 50, for sending the 2nd UDP packet to UDP unicast port by network access device 300, the
Two UDP packets include: server-side IP and service port number；
Client receiving unit 60 parses the 2nd UDP packet according to protocol massages format for receiving the 2nd UDP packet to obtain
Obtain server-side IP and service port number；Client receiving unit 60 includes: client storage unit 61, for receiving client
The server-side IP and service port number that the parsing of unit 60 obtains are stored into local file.
Connection unit 70, for connecting client by HTTP or Transmission Control Protocol at most n times with server-side, N is positive whole
Number；
Judging unit 80, for judging whether successful connection；
If it fails to connect, then client transmission unit 30 is sent out again through network access device 300 to UDP multicast port
Send the first UDP packet；
If successful connection, client monitoring unit 20 is closed to UDP unicast port snoop.
In the present embodiment, be also provided with: monitoring unit 62, for monitor client 200 and server-side 100 connection whether
It disconnects；
If connection disconnects, connection unit 70 reads server-side IP and service port number in local file, by client
200 and server-side 100 re-connect.
In the present embodiment, UDP multicast port includes UDP multicast conventional port and UDP multicast standby port, and UDP multicast is standby
It is 1-5 with the quantity of port.
In the present embodiment, network access device includes: router and interchanger.
In local area network provided in this embodiment based on UDP multicast in the device of dynamic addressing server, client 200 can
To obtain the server-side IP and service port number of server-side 100 automatically, make the connection server-side 100 automatically of client 200.
Also, judging unit 80 can decide whether successful connection, if it is judged that for "No", as connection failure,
Then client transmission unit 30 sends the first UDP packet to UDP multicast port again through network access device 300, thus again
Obtain server-side IP and service port number.Server-side IP and serve port can be obtained automatically to further realize client
Number, it is further ensured that client can be successfully connected to server-side.
The device of dynamic addressing server, needs not move through software in local area network provided in this embodiment based on UDP multicast
Implement personnel depaly server-side IP and service port number, it is possible to reduce the work of software implementation personnel promotes client and service
The joint efficiency at end.
In the present embodiment, client receiving unit 60 includes being also provided with client storage unit 61, is used for client
The server-side IP and service port number that the parsing of receiving unit 60 obtains are stored into local file, when monitoring 200 kimonos of client
Be engaged in end 100 connection disconnect when, connection unit 70 can read server-side IP and service port number in local file, again into
Row connection.To can quickly obtain server-side IP and service port number, make after the connection of client and server-side disconnects
Client and server-side connect automatically again.
In the present embodiment, the number that client and server-side are attached is preset as n times, and client and server-side carry out N
Secondary connection, if it fails to connect, then client re-starts monitoring, as 30 weight of client transmission unit to UDP unicast port
It is new to send the first UDP packet, to reacquire server-side IP and service port number.Lead to server-side in the change of later period network environment
When IP and service port number change, client can obtain server-side IP and service port number automatically again again, make client
Restore the connection with server-side.To be further reduced the work of software implementation personnel, the connection of client and server-side is promoted
Stability.
In the present embodiment, UDP multicast conventional port and UDP multicast standby port need the agreement before product is issued, for example,
UDP multicast standby port can be 1,2,3,4,5, and the particular number of UDP multicast standby port can be according to tool
The business demand of body is configured, to be further ensured that reliability that client is connected with server-side.
Through the foregoing embodiment it is found that dynamic addressing server in the local area network provided by the invention based on UDP multicast
Method and apparatus, at least realize it is following the utility model has the advantages that
1, client can obtain server-side IP and service port number automatically, and client is made to connect server-side automatically.To
Need not move through software implementation personnel depaly server-side IP and service port number, it is possible to reduce the work of software implementation personnel is promoted
The joint efficiency of client and server-side.
2, when the change of later period network environment causes server-side IP and service port number to change, client can obtain automatically again
Server-side IP and service port number are taken, client is made to restore the connection with server-side.To be further reduced software implementation personnel
Work, promote the stability of the connection of client and server-side.
3, client is by server-side IP and service port number storage into the local file of client；When client and service
When the connection at end disconnects, client reads server-side IP and service port number in local file, can quickly obtain service
IP and service port number are held, connects client and server-side automatically again.
4, the number that client and server-side are attached is preset as n times, if it fails to connect, then client is mono- to UDP
It broadcasts port and re-starts monitoring.When the change of later period network environment causes server-side IP and service port number to change, client can be with
It obtains server-side IP and service port number automatically again again, client is made to restore the connection with server-side.To further subtract
The work of few software implementation personnel, promotes the stability of the connection of client and server-side.
5, UDP multicast port includes UDP multicast conventional port and UDP multicast standby port, the number of UDP multicast standby port
Amount is 1-5, and server-side monitors UDP multicast conventional port, if UDP multicast conventional port is occupied, services
End is monitored by UDP multicast standby port.The particular number of UDP multicast standby port can according to specific business demand into
Row setting, to be further ensured that reliability that client is connected with server-side.
6, after client sends the first UDP packet to local area network multicast domain and UDP multicast port, in preset time T, if
Client does not receive the 2nd UDP packet, then client sends the first UDP packet to UDP multicast standby port, so as to further
Guarantee the reliability that client is connected with server-side.
Although some specific embodiments of the invention are described in detail by example, the skill of this field
Art personnel it should be understood that example above merely to being illustrated, the range being not intended to be limiting of the invention.The skill of this field
Art personnel are it should be understood that can without departing from the scope and spirit of the present invention modify to above embodiments.This hair
Bright range is defined by the following claims.
Claims (10)
1. a kind of method of dynamic addressing server in local area network based on UDP multicast, which comprises the steps of:
S1: local area network multicast domain is added in server-side；
S2: the server-side monitors UDP multicast port；
S3: local area network multicast domain is added in client；
S4: the client monitors UDP unicast port；
S5: the client sends the first UDP packet, the first UDP to the local area network multicast domain and the UDP multicast port
Packet includes: client ip and the UDP unicast port numbers；
S6: the server-side receives the first UDP packet, parses the first UDP packet according to protocol massages format to obtain
State client ip and the UDP unicast port numbers；
S7: the server-side sends the 2nd UDP packet, the 2nd UDP packet to the client ip and UDP unicast port
It includes: server-side IP and service port number；
S8: the client receives the 2nd UDP packet, parses the 2nd UDP packet according to protocol massages format to obtain
State server-side IP and the service port number；
S9: the client is carried out within n times by HTTP or Transmission Control Protocol with the server-side and connects, and N is positive integer；
S10: judge whether successful connection；
If it fails to connect, then return step S5；
If successful connection thens follow the steps S11: the client is closed to the UDP unicast port snoop, and is left described
Local area network multicast domain.
2. the method according to claim 1, wherein
Step S8 further include: by the server-side IP and service port number storage into the local file of the client.
3. according to the method described in claim 2, it is characterized in that,
When the connection of the client and the server-side disconnects, following steps are executed:
S01: the client reads the server-side IP and the service port number in the local file；
Execute step S9.
4. the method according to claim 1, wherein
The UDP multicast port includes UDP multicast conventional port and UDP multicast standby port, the UDP multicast standby port
Quantity is 1-5；
Step S2 is further are as follows: the server-side monitors UDP multicast conventional port, if the UDP multicast conventional end
Mouth is occupied, then the server-side monitors UDP multicast standby port.
5. according to the method described in claim 4, it is characterized in that,
Further include following steps after step S7:
S71: judge whether the client receives the 2nd UDP packet in preset time T；
If received, step S8 is executed；
If confiscated, step S72 is executed,
S72: the UDP multicast conventional port is replaced with into UDP multicast standby port；Then step S5 is executed.
6. the device of dynamic addressing server in a kind of local area network based on UDP multicast characterized by comprising
Server-side, client, network access device；
Server-side monitoring unit, for monitoring UDP multicast port；
Client monitoring unit, for monitoring UDP unicast port；
Client transmission unit, for sending the first UDP packet, institute to the UDP multicast port by the network access device
Stating the first UDP packet includes: client ip and the UDP unicast port numbers；
Server-side receiving unit, for receiving the first UDP packet, according to protocol massages format parse the first UDP packet with
Obtain the client ip and the UDP unicast port numbers；
Server-side transmission unit, for sending the 2nd UDP packet, institute to UDP unicast port by the network access device
Stating the 2nd UDP packet includes: server-side IP and service port number；
Client receiving unit, for receiving the 2nd UDP packet, according to protocol massages format parse the 2nd UDP packet with
Obtain the server-side IP and the service port number；
Connection unit connects, N for the client to be carried out within n times by HTTP or Transmission Control Protocol with the server-side
For positive integer；
Judging unit, for judging whether successful connection；
If it fails to connect, then the client transmission unit is again through the network access device to UDP multicast end
Mouth sends the first UDP packet；
If successful connection, the client monitoring unit is closed to the UDP unicast port snoop.
7. device according to claim 6, which is characterized in that
The client receiving unit includes: client storage unit, for obtain client receiving unit parsing
The server-side IP and service port number storage are into local file.
8. device according to claim 7, which is characterized in that further include:
Whether monitoring unit, the connection for monitoring the client and the server-side disconnect；
If connection disconnects, the connection unit reads the server-side IP and the serve port in the local file
Number, the client and the server-side are re-connected.
9. device according to claim 6, which is characterized in that
The UDP multicast port includes UDP multicast conventional port and UDP multicast standby port, the UDP multicast standby port
Quantity is 1-5.
10. device according to claim 6, which is characterized in that
The network access device includes: router and interchanger.
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