CN101925102A - Wireless network topology simulation method adopting Ethernet promiscuous mode - Google Patents
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Abstract
The invention relates to a method for realizing multi-hop wireless network topology simulation by adopting an Ethernet promiscuous mode, and belongs to the field of communication network protocol simulation. In the method, physical nodes and topology simulation nodes are configured into a special network structure by configuring a virtual personal network function of an Ethernet switch, namely the physical nodes cannot be intercommunicated with each other but can be communicated with the topology simulation nodes; and the topology simulation nodes work in the Ethernet promiscuous mode, adsorb data to the local nodes by constructing an address resolution protocol message which comprises an appointed media access control address, and judge whether to forward the data according to a topological structure so as to realize various types of topology simulation. The method can finish testing the correctness, the reliability and the performance of protocols under various topological structures within a small range and a short time without any change to the physical nodes, has the characteristics of high expandability, high robustness, high reliability, easy implementation and the like, and is suitable to be used in various wireless self-organizing network simulation tests.
Description
Technical field
The present invention relates to a kind of multi-hop wireless network topology hardware-in-the-loop simulation method that adopts the Ethernet promiscuous mode.This method adopt Ethernet switch VPN (Virtual Private Network, VPN) pattern inserts each equipment entity and topology simulation node, directly intercommunication between each equipment entity, but can with the intercommunication of topology simulation node; The topology simulation node is operated in the Ethernet promiscuous mode, specify media access control address (Medium Access Control by sending, MAC) address resolution protocol (Address Resolution Protocol, ARP) message is to attract network data, and whether should transmit data according to topological relation decision, with emulation and the performance statistics of finishing the various network topologies in the multi-hop wireless network.
Background technology
Along with the progress of development of science and technology and society, the cordless communication network technology is experiencing variation with rapid changepl. never-ending changes and improvements.Also in research with when disposing 3-G (Generation Three mobile communication system), in order to adapt to the requirement of communication in the future, international communication circle has taken up to study the mobile communication system of a new generation as people.
The third generation mobile communication system is stage and the target in the mobile communication system evolution process, and it not only adopts new Radio Transmission Technology to improve the performance of communication system, and with existing various wiredly merge mutually with wireless network; It not only comprises existing mobile cellular network structure, and also can adopt Ad hoc mode to carry out networking under some environment, perhaps adopts the combining form of two kinds of structures, forms double bounce or multihop network frame mode under the cellular network.
Usually, cellular network is a kind of network organizing mode of wide covering, and its target is to realize the wireless coverage of wide area under limited frequency and power resource prerequisite.Compare with cellular network architecture, Ad hoc mobile network version is more flexible, it adopts the distributed management technology, cooperated with each other and formed mobile communications network by one group of autonomous radio node, wherein, radio node is a portable terminal in general sense, can be used as wireless relay and routing device again transmits other user's data, therefore have News Search, networking and the self-healing ability of network have a wide range of applications fast.In view of the critical role of Ad hoc at wireless networking and next generation wireless network, IETF (Internet Engineering Task Force) has set up MANET working group, carries out the research of Ad hoc network.
Characteristics such as this freedom of Ad hoc network, dynamic, spontaneous networking make people and equipment to communicate in the zone of no communications facility temporarily at some, and even to this day, Ad hoc network technology has been widely used in rescue and relief work and military communication field.New technology is the appearance of bluetooth, WiFi and HyperLAN for example, has also advanced Ad hoc network in the military commercialization process in field in addition greatly.
Networking is a key factor in the wireless Ad hoc network, at present also as yet not the scheme of neither one overall optimum can satisfy all application requirements under the Ad hoc network environment, may there be bigger difference in different agreements under different network topology environment.Therefore, at the network agreement artificial of different topology environment, the agreement of wireless network had great meaning.
Computer Simulation and foundation experiment bed are to study the common method of Ad Hoc network at present.
Common network simulation software as Qualnet, NS2, OPNET etc., can be set up Ad Hoc network simulation model, and it is aspect the research of Routing Protocol and MAC algorithm.
Aspect foundation experiment bed, in people's such as the Maltz of CMU the experiment, outdoor five mobile nodes, two stationary nodes composition Ad hoc networks tested.In the experiment that University Of Tianjin gold will has just waited, the experiment bed is by Network maker, base station system, measuring system, form based on software router and mobile node five parts of Linux.Owing to be the little space realization mobile network in the laboratory, there are two problems to need to solve.A problem is, because the design function scope of wireless network card is a hundreds of rice, is difficult to realize the routed environment of Ad Hoc network multi-hop; Another problem is that the multipath of transmission signals disturbs and to make the route instability.Other experiment bed also has APE (Ad hocProtocol Evaluation) experiment bed.
The advantage of Computer Simulation is apparent, and system is represented by strict mathematics model, graphics mode or the calculating preface of having the records of distance by the log, and need not to adopt any parts of real system, is the pure software system.But because people's decision process is an indispensable link in the system, applied mathematics or computer program are difficult to successfully imitate this link, so its limitation is arranged.In addition, pure software emulation need realize the software on the test material object again, increase workload on emulation platform.At present many people attempt to adopt artificial intelligence technology such as (AI) to improve the simulated mass of this link, but prematurity still so far.This simulation model level of abstraction is the highest, and simulation cost is economized most, and institute takes time the shortest, and it is also the easiest to do various Variable Control tests, but has the problem of simulation result confidence level.And the general scale of experiment bed emulation testing is less, is difficult in and simulates various topological structures in the confined space, has scaling concern.
Summary of the invention
Technical problem: the purpose of this invention is to provide a kind of wireless network topology simulation method that adopts the Ethernet promiscuous mode, this existing Computer Simulation, the hybrid simulation method that has added equipment in kind again according to the angle of research, can overcome the shortcoming of pure software emulation and small scale experiments bed, make that research is more convenient and comprehensive.Compare with traditional wireless network topology simulation software, this method has reduced to be needed in traditional pure software emulation the virtualized workload of device software in kind, simultaneously also more near actual conditions; Compare with traditional experiment bed emulation mode, this method can be simulated the network topology environment that simulates multiple complexity under less space environment.Simultaneously, this method is the mixed networking function of virtual support device node and device node in kind also, supports the emulation and the simulation of multiple wireless channel, can be widely used in protocol test, performance simulation and the system simulation of wireless device.
Technical scheme: this method is made up of channel connection device and topology simulation equipment.The channel connection device is a commercial switch of supporting the VPN function, each node in kind and topology simulation node all are connected on this channel connection device, be configured to can't directly be communicated with between each node in kind by VPN, but the Star Schema that they can be communicated with simulation node.Simulation node is the computer of this hardware-in-the-loop simulation of operation software, monitor the data that each device node in kind sends by operating in the Ethernet promiscuous mode, by constructing special ARP message the data that all nodes in kind send are all absorbed this node, select whether should transmit these data according to the virtual topological structure of network again.When the emulation topological structure, can adopt modes such as random topology structure, special topological structure and external topology information server to produce topology; Support multiple channel model, can be according to different channel qualities of parameters simulation such as internodal distance, signal to noise ratios.The topology simulation method of wireless network that is applicable to of the present invention is made of connection device configuration, connection procedure and topology simulation process.Before detailed process is described, introduce two definition earlier:
● node call number index: distribute to the index number of each node in kind, (Internet Protocol is IP) behind the address with Internet protocol usually
Bit is as the call number of node in kind, and each node in kind has different inode number;
● actual node MAC Address: the physics MAC Address of node configuration Ethernet card in kind;
● emulation MAC index address: the topology simulation node can adopt " 01-01-01-01-01-index " form according to " vacation " MAC Address of the call number index generation of node in kind.Emulation MAC index address and node in kind are corresponding one by one.The topology simulation node can judge whether it is the data (preventing internal loopback) that this topology simulation node sends on the one hand according to this special " emulation MAC index address ", can learn also that according to this MAC Address actual next jump node in kind simultaneously.
Be concrete connection device configuration, connection procedure and topology simulation process prescription below:
1), connection device configuration, connection procedure:
11), count N according to the node in kind that participates in emulation, select to possess the commercial switch (the switch ports themselves number is N+1) of VPN function, wherein port one connects the topology simulation computer, and port 2～N+1 connects node in kind respectively;
12), each node in kind and topology simulation computer configuration be IP address different under the same network segment and Ethernet card address (wherein the IP address after
The index number of bit representation node), and by Ethernet card connect the switch corresponding ports;
13), the VPN parameter of configuration switch, make switch 1 port and other all of the port to be communicated with, but can't be communicated with between other port;
14), whether satisfy switch 1 port and other all of the port can be communicated with, but the condition that can't be communicated with between other port by ping order test.If satisfied then connection device disposes, connection procedure successfully finishes, otherwise the equipment that reexamines connects and the switch parameter configuration.
2), topology simulation node simulation process is as follows:
21), the relevant parameter of topology simulation node is set, comprise mobility model, channel model of initial position message, the node of node in kind or the like;
22), the topology simulation node reads in the initiation parameter file, is arranged to operate in the Ethernet promiscuous mode simultaneously, this pattern lower node can receive all data that other port sends on the switch;
23), when receiving network data, whether judgment data is the data that this topology simulation node sends out, the data if not this machine sends then change step 24 over to); Otherwise stay in step 23);
24), judge type of message, if the ARP request message then enters ARP request message processing procedure; If arp response message then enters the arp response Message Processing; If common IP data then change the IP data handling procedure over to.If other categorical data wouldn't be handled, wait for new message input, jump to step 23 again);
3), ARP request message processing procedure:
31), when network is received the ARP request message, at first write down the MAC Address and the IP address corresponding relation of source node;
32), this locality searches whether have destination node MAC Address and IP address relationship table, if exist then construct the loopback of an arp response message, wherein the source MAC in the message changes to " emulation MAC index address "; If there is no the MAC Address of destination node and IP address relationship table then re-construct a new ARP request message, and message source MAC and IP address are the real MAC and the IP address of simulation node;
33), wait for new message input, jump to step 23 again)
4), the arp response message processing procedure is as follows:
41), when network is received arp response message, the MAC Address and the IP address corresponding relation of record source node;
42), wait for new message input, jump to step 23 again);
5), IP class message processing procedure is as follows:
51), obtain source node call number indexSrc according to source MAC;
52) be unicast data or broadcast data, according to destination address MAC Address judgment data bag.If unicast data enters step 53), otherwise enter step 55);
53), according to target MAC (Media Access Control) address search purposes node call number indexDst;
54), according to node call number indexSrc, indexDst query node topological connection relation table, judge whether transmit these data.If topological connection table shows that two node datas can reach, then source MAC is changed to corresponding emulation index MAC Address in the message, and target MAC (Media Access Control) address changes the MAC Address of real node into, transmits this message; If topological connection table shows that two node datas are unreachable, then abandon this message.Again jump to step 23);
55), record source node MAC Address and IP address corresponding relation;
56), according to the neighbor list of source node, broadcast is converted to a plurality of unicast messages, wherein the sending node MAC Address is converted to corresponding emulation index MAC Address, the destination node MAC Address changes the MAC Address of actual node into, sends message.Again jump to step 23);
6), node communication routine in kind:
61), node in kind before IP data communications, at first search the next-hop node IP address that arrives destination node according to kernel route table;
62), then need to send earlier the ARP request to obtain the MAC Address of next-hop node if there is not the MAC Address of next-hop node;
63), after the MAC Address that obtains next jumping or destination node, send related data immediately, wherein the target MAC (Media Access Control) address of message is filled in the MAC Address in the arp response, purpose IP fills in the address destination node IP address.
Beneficial effect: the present invention inserts each node in kind and topology simulation node by switch VPN pattern, the topology simulation node is operated in the Ethernet promiscuous mode, by sending specific ARP information the data that node in kind sends are absorbed this node, judge whether to transmit the method for message again according to internodal topological relation, realized the topological hardware-in-the-loop simulation purpose of wireless self-organization network.By using this method, can realize the hardware-in-the-loop simulation of a plurality of nodes in kind under the multi-hop wireless network environment, and have following beneficial effect:
1, realizes the topology simulation of multi-hop wireless network, can finish the simulating, verifyings such as correctness, validity and network performance of each quasi-protocol;
2, implementation method is simple.Only need switch device is carried out simple VPN configuration, as required the topology simulation node is carried out the simulation that easy configuration can be finished complicated multi-hop wireless network topology.
3, than other pure software emulation mode, this method can be carried out emulation testing without any need for other modification, and directly the method for access node in kind will be more near actual conditions in employing simultaneously.
4, than the experiment bed process, this method can realize the network topological simulating of multiple complexity more among a small circle and in the short time, and the emulation testing checking more comprehensively and efficient.
5, this emulation mode is fully transparent to the node in kind of test, and promptly node in kind not being needed to make any modification can carry out, and extensibility is better, can with existing various network device intercommunication.
In sum, it is good that the present invention has extensibility, and robustness is good, and reliability is high and be easy to characteristics such as realization, is fit to be applied in the various wireless self-organization networks.
Description of drawings
The present invention is further described below in conjunction with accompanying drawing.
Fig. 1: node in kind and topology simulation node connection layout;
Fig. 2: topology simulation node simulation process;
Fig. 3: ARP request message processing procedure;
Fig. 4: arp response message processing procedure;
Fig. 5: IP class message processing procedure;
Fig. 6: node communication routine in kind;
Fig. 7: the message addresses situation of change in the emulation.
1) (mac2 ip2) represents message source MAC, IP respectively to the sequence in the message, purpose MAC, IP address for macl, ip1;
2) mac_a, mac_b, mac_s represent the real mac address of node a, b, s; Mac_broad represents the mac broadcast address; Mac_sa, mac_sb represent the emulation index mac address of topology simulation node at node a and node b respectively;
3) ArpReq, ArpRes represent ARP request and response message; Data represents the IP data.
Embodiment
The emulation mode that is applicable to multi-hop wireless self-organizing network adopts the Ethernet promiscuous mode, by constructing special ARP message, data between node in kind is absorbed simulation node, and whether decision transmits data according to topological structure.Its implementation mainly is divided into two parts process promptly: connection device configuration, connection procedure and topology simulation process, describe it below respectively in detail:
By Ethernet switch node in kind is linked to each other with the topology simulation node, makes directly intercommunication between each node in kind by configuration VPN relevant parameter, but they can with the intercommunication of topology simulation node.
The topology simulation node is operated in the Ethernet promiscuous mode, by constructing special ARP message, the data that send between node in kind is attracted to this node, whether should transmit these data to destination node according to the topology judgement of setting.
Be concrete connection device configuration, connection procedure and topology simulation process prescription below:
1), connection device configuration, connection procedure:
11), count N according to the node in kind that participates in emulation, select to possess the commercial switch (the switch ports themselves number is N+1) of VPN function, wherein port one connects the topology simulation computer, and port 2～N+1 connects node in kind respectively;
12), each node in kind and topology simulation computer configuration be IP address different under the same network segment and Ethernet card address (wherein the IP address after
The index number of bit representation node), and by Ethernet card connect the switch corresponding ports;
13), the VPN parameter of configuration switch, make switch 1 port and other all of the port to be communicated with, but can't be communicated with between other port;
14), whether satisfy switch 1 port and other all of the port can be communicated with, but the condition that can't be communicated with between other port by ping order test.If satisfied then connection device disposes, connection procedure successfully finishes, otherwise the equipment that reexamines connects and the switch parameter configuration.
2), topology simulation node simulation process is as follows:
21), the relevant parameter of topology simulation node is set, comprise mobility model, channel model of initial position message, the node of node in kind or the like;
22), the topology simulation node reads in the initiation parameter file, is arranged to operate in the Ethernet promiscuous mode simultaneously, this pattern lower node can receive all data that other port sends on the switch;
23), when receiving network data, whether judgment data is the data that this topology simulation node sends out, the data if not this machine sends then change step 24 over to); Otherwise stay in step 23);
24), judge type of message, if the ARP request message then enters ARP request message processing procedure; If arp response message then enters the arp response Message Processing; If common IP data then change the IP data handling procedure over to.If other categorical data wouldn't be handled, wait for new message input, jump to step 23 again);
3), ARP request message processing procedure:
31), when network is received the ARP request message, at first write down the MAC Address and the IP address corresponding relation of source node;
32), this locality searches whether have destination node MAC Address and IP address relationship table, if exist then construct the loopback of an arp response message, wherein the source MAC in the message changes to " emulation MAC index address "; If there is no the MAC Address of destination node and IP address relationship table then re-construct a new ARP request message, and message source MAC and IP address are the real MAC and the IP address of simulation node;
33), wait for new message input, jump to step 23 again)
4), the arp response message processing procedure is as follows:
41), when network is received arp response message, the MAC Address and the IP address corresponding relation of record source node;
42), wait for new message input, jump to step 23 again);
5), IP class message processing procedure is as follows:
51), obtain source node call number indexSrc according to source MAC;
52) be unicast data or broadcast data, according to destination address MAC Address judgment data bag.If unicast data enters step 53), otherwise enter step 55);
53), according to target MAC (Media Access Control) address search purposes node call number indexDst;
54), according to indexSrc, indexDst query node topological connection relation table, judge whether transmit these data.If topological connection table shows that two node datas can reach, then source MAC is changed to corresponding emulation index MAC Address in the message, and target MAC (Media Access Control) address changes the MAC Address of real node into, transmits this message; If topological connection table shows that two node datas are unreachable, then abandon this message.Again jump to step 23);
55), record source node MAC Address and IP address corresponding relation;
56), according to the neighbor list of source node, broadcast is converted to a plurality of unicast messages, wherein the sending node MAC Address is converted to corresponding emulation index MAC Address, the destination node MAC Address changes the MAC Address of actual node into, sends message.Again jump to step 23);
6), node communication routine in kind:
61), node in kind before IP data communications, at first search the next-hop node IP address that arrives destination node according to kernel route table;
62), then need to send earlier the ARP request to obtain the MAC Address of next-hop node if there is not the MAC Address of next-hop node;
63), after the MAC Address that obtains next jumping or destination node, send related data immediately, wherein the target MAC (Media Access Control) address of message is filled in the MAC Address in the arp response, purpose IP fills in the address destination node IP address.
Claims (1)
1. wireless network topology simulation method that adopts the Ethernet promiscuous mode, it is characterized in that VPN function by Ethernet switch, node in kind is become the special networks structure with the topology simulation node configuration, be can't intercommunication between node in kind, but can be communicated with the topology simulation node; The topology simulation node is operated in the Ethernet promiscuous mode, and the address resolution protocol message by structure appointment media access control address absorbs this node with data, judges whether to transmit data according to topological structure;
1), connection device configuration, connection procedure:
11), count N according to the node in kind that participates in emulation, the port number of selecting to possess the VPN function is the commercial switch of N+1, and wherein port one connects the topology simulation computer, and port 2～N+1 connects node in kind respectively;
12), each node in kind is Internet protocol address and Ethernet card addresses different under the same network segment with the topology simulation computer configuration, wherein Internet protocol address after
The index number of bit representation node, and by Ethernet card connection switch corresponding ports;
13), the VPN parameter of configuration switch, make switch 1 port and other all of the port to be communicated with, but can't be communicated with between other port;
14), whether test satisfies switch 1 port and other all of the port can be communicated with, but the condition that can't be communicated with between other port, if satisfy then connection device configuration, connection procedure successfully finish, otherwise the equipment that reexamines connects and the switch parameter configuration;
2), topology simulation node simulation process is as follows:
21), the relevant parameter of topology simulation node is set, comprise initial position message, the mobility model of node, the channel model of node in kind;
22), the topology simulation node reads in the initiation parameter file, is arranged to operate in the Ethernet promiscuous mode simultaneously, this pattern lower node can receive all data that other port sends on the switch;
23), when receiving network data, whether judgment data is the data that this topology simulation node sends out, the data if not this machine sends then change step 24 over to); Otherwise stay in step 23);
24), judge type of message, if the request message of address resolution protocol, then enter the request message processing procedure of address resolution protocol; If the response message of address resolution protocol, the response message that then enters address resolution protocol is handled; If the general internet protocol data, then change the data handling procedure of Internet protocol over to, if other categorical data wouldn't be handled, wait for new message input, jump to step 23 again);
3), the request message processing procedure of address resolution protocol:
31), when network is received the request message of address resolution protocol, at first write down the media access control address and the Internet protocol address corresponding relation of source node;
32), this locality is searched and whether is had destination node media access control address and Internet protocol address relation table, if exist then construct the response message loopback of an address resolution protocol, wherein the source media access control address in the message changes to " index address of emulation link layer "; The if there is no media access control address of destination node and Internet protocol address relation table, then re-construct the request message of a new address resolution protocol, message source media access control address and Internet protocol address are the true media access control address and the Internet protocol address of simulation node;
33), wait for new message input, jump to step 23 again)
4), the response message processing procedure of address resolution protocol is as follows:
41), when network is received the response message of address resolution protocol, the media access control address and the Internet protocol address corresponding relation of record source node;
42), wait for new message input, jump to step 23 again);
5), Internet protocol class message processing procedure is as follows:
51), obtain the source node call number according to the source media access control address;
52), be unicast data or broadcast data according to destination address media access control address judgment data bag, if unicast data enters step 53), otherwise enter step 55);
53), according to purpose media access control address search purposes node call number;
54), according to source node call number and purpose call number query node topological connection relation table, judge whether transmit these data; If topological connection table shows that two node datas can reach, then the source media access control address is changed to corresponding emulation index media access control address in the message, and the purpose media access control address changes the media access control address of real node into, transmits this message; If topological connection table shows that two node datas are unreachable, then abandon this message.Again jump to step 23);
55), the media access control address and the Internet protocol address corresponding relation of record source node;
56), according to the neighbor list of source node, broadcast is converted to a plurality of unicast messages, wherein the sending node media access control address is converted to corresponding emulation index media access control address, the destination node media access control address changes the media access control address of actual node into, sends message.Again jump to step 23);
6), node communication routine in kind:
61), node in kind before the Internet protocol data communication, at first search the next-hop node Internet protocol address that arrives destination node according to kernel route table;
62), then need to send earlier the request of address resolution protocol to obtain the media access control address of next-hop node if there is not the media access control address of next-hop node;
63), behind the media access control address that obtains next jumping or destination node, send related data immediately, the media access control address in the response of the purpose media access control address fill address analysis protocol of message wherein, the purpose Internet protocol address is filled in the destination node Internet protocol address.
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