CN106603348B - A method and system for simulating DHCP Offer flooding - Google Patents

Abstract

The invention discloses a method for simulating DHCP Offer flooding, which includes: a test host builds a DHCP Offer package; the router to be tested requests an IP from the companion router through a hub, and disconnects the companion router during the 1/2 time of the lease period for obtaining the IP Connection with the hub; the test host sends a large number of DHCP Offer packets to the router to be tested through the hub; the test host judges whether the router to be tested has obtained the source IP in the DHCP Offer packet, and if so, judges that the DHCP function of the router to be tested is abnormal; otherwise Stop sending the DHCP Offer packet, and re-establish the connection between the router under test and the hub, and judge whether the router under test can obtain the IP sent by the router under test. If so, judge that the DHCP function of the router under test is normal; Abnormal function. The invention solves the shortage of test environment resources at present.

Description

A method and system for simulating DHCP Offer flooding

technical field

The invention belongs to the field of testing, in particular to a method and system for simulating DHCP Offer flooding.

Background technique

DHCP (Dynamic Host Configuration Protocol, DHCP) is a dynamic host configuration protocol, which is a network protocol for a local area network. It is usually applied in a large-scale local area network environment. Its main function is to centralize management and assign IP addresses, so that hosts in the network environment can dynamically obtain information such as IP addresses, Gateway addresses, and DNS server addresses, and can improve the utilization rate of addresses. . At first, the use of flooding in the laboratory environment to test the DHCP function of the router did not appear. Due to environmental interference, the wrong or too many addresses were taken and the Internet could not be accessed. This problem was only discovered after customer feedback on-site inspection. Later, although there is a test environment, the existing laboratory environment test resources are limited, and the test in the real environment cannot be fully realized. This requires preparing multiple DHCP servers and setting different IPs, and responding to the DHCPDiscover sent by the router to simulate flooding. Test, the test environment resources are very tight, the cost of the test environment is high, and the test resources are wasted when the DHCP function is not tested. The test environment is complex and requires someone to guide the operation, which is time-consuming and labor-intensive.

Contents of the invention

The present invention provides a method and system for simulating the flooding of DHCP Offer (DHCP offer message), which is used to solve the problem in the prior art that the resources of the test environment for testing the DHCP function of the router are tight.

A kind of method of simulating DHCP Offer flooding of the present invention comprises steps:

The test host described in S100 constructs a DHCP Offer package;

S200 The router to be tested requests an IP address from the router to be tested through the hub, and after the router to be tested successfully obtains the IP address assigned by the router to be tested, disconnect the router to be tested from the hub during 1/2 of the lease period connection between

S300 The test host sends a large number of formed DHCP Offer packets to the router to be tested through the hub, and the DHCP Offer packet includes a source IP address provided to the router to be tested;

The test host in S400 judges whether the router to be tested has obtained the source IP address in the DHCP Offer packet, if so, enters step S500, otherwise enters step S600;

S500 judges that the DHCP function of the router to be tested is abnormal;

In S600, the test host stops sending the DHCP Offer packet, and re-establishes the connection between the test router and the hub, and judges whether the test router can obtain the IP address sent by the test router, and if so, enters step S700, Otherwise, enter step S500;

The S700 judges that the DHCP function of the router under test is normal.

The invention discloses a method for simulating DHCP Offer flooding, which is applicable to all routers. Mainly by building a DHCP Offer package, when the router normally obtains an IP address, when sending a DHCP Request within 1/2 of the lease period, it disconnects from the accompanying test router (equivalent to a server) that assigns its IP address, and then simulates the environment Existing interference (sending a large number of DHCP Offer packets), the method for simulating DHCP Offer flooding of the present invention can be used to test whether the router will take the wrong address, and judge the DHCP function of the router. The method is simple and feasible, easy to operate and control, simple in the test environment, saves test resources, reduces costs, improves test efficiency, and solves the problem of tight resources in the test environment for testing the DHCP function of the router existing in the prior art.

Further, it also includes: S010 setting the Internet access mode of the router to be tested as DHCP, and setting the lease period of the router to be tested; S020 connecting the test host to the hub by wire, and the router to be tested and the router to be tested are connected to the hub by wire respectively, and the router is established. test environment.

Further, the step S200 includes:

The router to be tested in S210 sends out a DHCP Discover message in broadcast mode, requesting to lease an IP address;

S220 After receiving the DHCP Discover message, the accompanying router sends a DHCP Offer message to the router under test, and the message includes the IP address that the accompanying router can provide to the router under test. and the IP address of the accompanying test router itself;

S230 After receiving the DHCP Offer message, the router to be tested sends a broadcast DHCP Request message, and adds the address of the router to be tested and the address of the router to be tested to the option field of the DHCP Request message. IP address;

S240, the accompanying test router sends a response DHCP ACK message after receiving the DHCP Request message, and adds the use lease period information of the IP address applied for by the router to be tested in the option field of the DHCP ACK message;

S250 After the router under test receives the DHCP ACK message, check whether the IP address assigned by the router under test can be used, if so, the router under test successfully obtains the selected IP address, and according to the The IP address uses the lease period to automatically start the continuation process;

S260 Disconnect the communication connection between the router under test and the hub at 1/2 of the lease period of the IP address acquired by the router under test, and the router under test will send a DHCP Request message to the router under test to renew the IP address lease.

Select 1/2 of the lease period to disconnect the connection between the router under test and the hub, so that the router under test and the router under test cannot communicate with each other about renewing the IP address through messages. At this time, add a lot of external interference, that is, send a large number of DHCP Offer message, to see if the router will be interfered by it and mistakenly take the IP address in the interfered message.

Further, the step S100 includes: S110, the test host constructs a large number of DHCP Offer packets through xcap. This solution uses the xcap software package to implement a simulated DHCP Offer flood. xcap is a windows contracting tool that can read all network interfaces from the system. The xcap sending tool can send structured messages from the specified interface on windows, and supports two simple sending strategies, one is to send the selected (selected with the mouse), and the other is to send the reply in a loop. xcap supports the construction of common Ethernet packets, including arp, rarp, ipv4, ipv6, icmpv4, icmpv6, igmp, udp, tcp, pim, ospf, rip, snmp, ppp, pppoe, ipsec (ah/esp), etc. And some uncommon packets, such as 802.3, STP, etc. The xcap software can simulate various DHCP Offer packages, so that there is no omission in the comprehensive test. The xcap software is the inherent environment of the test protocol conformance function test bed. It has SOP reference documents. The simple operation allows testers to get started quickly. It has the advantages of easy control, resource reuse, and high efficiency. In addition, while ensuring the quality and efficiency of the test, it can also save laboratory resources, rationally allocate, and fix the test environment, which is conducive to ensuring the accuracy of the test results.

Further, the step S300 includes: S310, the test host cyclically sends a large number of formed DHCP Offer packets to the router under test through a hub, and the DHCP Offer package includes the source IP address provided to the router under test.

The present invention also provides a system for simulating DHCP Offer flooding, comprising: a router to be tested, a router to be tested, a test host and a hub, and the router to be tested, the router to be tested and the host to be tested are respectively wired to the hub, The test host includes: a package module, a message transceiver module, and an inspection and judgment module, and the message transceiver module is connected to the package module and the inspection and judgment module respectively, wherein:

The package module of the test host builds a DHCP Offer package;

The router to be tested requests an IP address from the router to be tested through the hub, and after the router to be tested successfully obtains the IP address assigned by the router to be tested, disconnect the router to be tested from the hub during 1/2 of the lease period Connection;

The message sending and receiving module of the test host sends a large amount of DHCP Offer packets formed by the grouping module to the router to be tested through the hub;

The inspection and judgment module of the test host judges whether the router to be tested has obtained the source IP address in the DHCP Offer packet;

If the inspection and judgment module of the test host judges that the router to be tested has obtained the source IP address in the DHCP Offer packet, then it is judged that the router to be tested has an abnormal DHCP function;

If the inspection and judgment module of the test host judges that the router to be tested has not obtained the source IP address in the DHCP Offer packet, then the message transceiver module of the test host stops sending the DHCP Offer packet, and re-establishes the companion test The connection between the router and the hub, the inspection and judgment module of the test host further judges whether the router to be tested can obtain the IP address sent by the router to be tested, if so, the inspection and judgment module of the test host judges whether the router under test DHCP If the function is normal, otherwise the checking and judging module of the test host judges that the DHCP function of the router under test is abnormal.

The system of the present invention is simple and easy to control, the test environment is fixed, the test personnel can get started quickly, and the efficiency is high. This system can also be reused to save test resources. In addition to testing the router function, this environment can also perform protocol tests such as ARP and port vulnerability scanning tests.

Further, the test host also includes a setting module connected to the message sending and receiving module, wherein: the setting module of the test host sets the Internet access mode of the router to be tested to DHCP, and sets the lease period of the router to be tested.

Further, the router to be tested requests an IP address from the router to be tested through the hub, and after the router to be tested successfully obtains the IP address assigned by the router to be tested, disconnect the router to be tested from the router during the lease period. Connections between hubs; including:

The router to be tested sends a DHCP Discover message in a broadcast mode, requesting to lease an IP address;

After the accompanying test router receives the DHCP Discover message, it sends a DHCP Offer message to the test router, and the message includes the IP address and the IP address that the test companion router can provide to the test router. The IP address of the accompanying test router itself;

After the router to be tested receives the DHCP Offer message, it sends a broadcast DHCP Request message, and adds the address of the router to be tested and the IP address applied for by the router to be tested in the option field of the DHCP Request message. address;

After the accompanying test router receives the DHCP Request message, it sends a response DHCP ACK message, and adds the lease period information of the IP address applied for by the router to be tested in the option field of the DHCP ACK message;

After the router to be tested receives the DHCP ACK message, check whether the IP address assigned by the router to be tested can be used, if so, the router to be tested successfully obtains the selected IP address, and according to the IP The address uses the lease period to automatically start the continuation process;

At 1/2 of the lease period of the IP address acquired by the router to be tested, disconnect the communication connection between the router to be tested and the hub, and the router to be tested will send a DHCP Request message to the router to be tested. Renew IP address lease.

Further, the grouping module of the test host builds a DHCP Offer package through xcap software.

Further, the message sending and receiving module of the test host cyclically sends a large number of formed DHCP Offer packets to the router under test through the hub, and the DHCP Offer package includes the source IP address provided to the router under test.

The beneficial effects of the present invention are as follows:

(1) Simulate the formation of various DHCP Offer packages, and comprehensively test without omissions.

(2) The test environment can be reused without using multiple servers, saving test resources and space utilization. Moreover, the environment can also perform protocol tests such as ARP, port vulnerability scanning tests, etc.

(3) The test environment is fixed to ensure the test quality.

(4) The operation is simple, the test environment is easy to control, and the operator is easy to use.

(5) The cost is low, and the test efficiency is improved while reducing the cost.

In summary, the present invention has the advantages of ensuring test quality, saving test resources, and improving test efficiency.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is a flow chart of Embodiment 1 of a method for simulating DHCP Offer flooding in the present invention;

Fig. 2 is a flow chart of the DHCP lease process of the router to be tested in another embodiment of a method for simulating DHCP Offer flooding of the present invention;

Fig. 3 is a block diagram of a system embodiment of simulating DHCP Offer flooding in the present invention;

Fig. 4 is a topological diagram of a system embodiment simulating DHCP Offer flooding in the present invention;

FIG. 5 is a flow chart of another embodiment of a method for simulating DHCP Offer flooding according to the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments . Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The present invention discloses a method for simulating DHCP Offer flooding. Embodiment 1 is shown in FIG. 1 and includes steps:

The test host described in S100 constructs a DHCP Offer package;

S200 The router to be tested requests an IP address from the router to be tested through the hub, and after the router to be tested successfully obtains the IP address assigned by the router to be tested, disconnect the router to be tested from the hub during 1/2 of the lease period connection between

S300 The test host sends a large number of formed DHCP Offer packets to the router to be tested through the hub, and the DHCP Offer packet includes a source IP address provided to the router to be tested;

The test host in S400 judges whether the router to be tested has obtained the source IP address in the DHCP Offer packet, if so, enters step S500, otherwise enters step S600;

S500 judges that the DHCP function of the router to be tested is abnormal;

In S600, the test host stops sending the DHCP Offer packet, and re-establishes the connection between the test router and the hub, and judges whether the test router can obtain the IP address sent by the test router, and if so, enters step S700, Otherwise, enter step S500;

The S700 judges that the DHCP function of the router under test is normal.

This embodiment simulates a test environment for DHCP Offer flooding, using a testing router as a server, and using a test host to form a large number of DHCP Offer packets to simulate DHCP flooding. First of all, the test host builds a large number of DHCPOffer packets first, and does not send them after they are built, and then sends them together later to create a flooding phenomenon. The accompanying router acts as a server, so the tested router first applies for an IP address from the accompanying router (equivalent to a server) to see if it can obtain an IP address normally. If the route to be tested can successfully obtain the IP address assigned by the route to be tested, at the moment of 1/2 of the lease period of this IP address, disconnect the router to be tested from the hub, and then let the test host The router under test sends a large number of DHCP Offer packets that have been formed before. This DHCP Offer package contains the IP provided for the router under test, which is called the source IP here. Note that the source IP here is not the same as the IP address provided by the test router to the router under test, because this is a message sent by the test host counterfeiting the server. This message is the same as the IP address assigned by the test router to the test router. Except for the IP address provided by the DHCP Offer message of the router, the rest are not much different. Even, in order to deceive the router under test, the IP address of the sender included in the DHCP Offer message sent by the test host is not its real IP address, but pretends to be the router under test. The IP address of the sender contained in the message is It is the IP of the test router. Therefore, if the router to be tested does not further verify and confirm the message, but obtains the source IP address in the DHCPOffer message sent by the test host, it means that the DHCP function of the router to be tested is abnormal. That is to say, then it is judged whether the router to be tested has obtained the source IP address in the DHCP Offer packet sent by the test host, and if it is obtained, it means that the DHCP function of the router to be tested is abnormal. If it is not obtained, then connect the network cable between the test router and the hub to establish a connection, and then check to determine whether the router to be tested has obtained the IP provided by the test router. IP, it means that the DHCP function of the router to be tested is normal. If it cannot be obtained, it is judged that the DHCP function of the router to be tested is abnormal.

The method of this embodiment is simple and easy to implement, can be reused, saves test resources, does not need to provide multiple DHCP servers, and solves the shortage of resources in the test environment by simulating DHCP flooding. The cost is reduced, the test efficiency is improved, and the test quality is guaranteed.

Preferably, before the test in the above embodiment starts, corresponding settings need to be made to build a test environment. Specifically, set the Internet access mode of the router to be tested as DHCP, and set the lease period of the router to be tested, such as 1 minute, and connect the test host to the hub by wire. Of course, the router to be tested and the router to be tested are respectively wired to the hub. In this way, the test environment is set up.

Preferably, in the above embodiment, in the step S100, the test host builds a large number of DHCP Offer packages, which we can use xcap software to build. The xcap software is the inherent environment in the test protocol consistency function test bed, and there is a SOP reference Documentation, simple operation allows testers to get started quickly, and testers who don't know the test environment only need to refer to the SOP document to test; in addition, it has the advantages of easy control, resource reuse, and high efficiency.

Preferably, in the above embodiment, as shown in FIG. 2, the step S200 includes the steps of:

The router to be tested in S210 sends out a DHCP Discover message in broadcast mode, requesting to lease an IP address;

S220 After receiving the DHCP Discover message, the accompanying router sends a DHCP Offer message to the router under test, and the message includes the IP address that the accompanying router can provide to the router under test. and the IP address of the accompanying test router itself;

S230 After receiving the DHCP Offer message, the router to be tested sends a broadcast DHCP Request message, and adds the address of the router to be tested and the address of the router to be tested to the option field of the DHCP Request message. IP address;

S240, the accompanying test router sends a response DHCP ACK message after receiving the DHCP Request message, and adds the use lease period information of the IP address applied for by the router to be tested in the option field of the DHCP ACK message;

S250 After the router under test receives the DHCP ACK message, check whether the IP address assigned by the router under test can be used, if so, the router under test successfully obtains the selected IP address, and according to the The IP address uses the lease period to automatically start the continuation process;

S260 Disconnect the communication connection between the router under test and the hub at 1/2 of the lease period of the IP address acquired by the router under test, and the router under test will send a DHCP Request message to the router under test to renew the IP address lease.

After reaching half of the validity period stipulated in the lease contract (that is, 1/2 of the lease period), the router to be tested will enter the "renewal state", and the router to be tested will send an IP address to the DHCP server (that is, the companion router to be tested). ) Unicast sends a DHCP REQUEST message to renew the IP lease. , if the accompanying test router as the DHCP server thinks it can continue to use, it will return a confirmation message to the test router, so that the test router successfully renews the lease of the IP address. If the router under test thinks that the IP address can no longer be assigned to the router under test, it will notify the router under test that it cannot obtain a new lease. If the renewal operation fails during the half time of the lease, the router under test will be recycled by the server if it has not obtained the confirmation message from the server when the lease period reaches 7/8 (87.5%). The client must restart the lease application process. Therefore, disconnect the communication connection between the test router and the hub at 1/2 of the lease period, so that the test router fails to receive the lease message or cannot return a lease renewal reply message to the router to be tested. At this time, pass the test The host sends a large number of DHCP Offer packets, pretending to be a testing router, simulating the flooding of DHCP Offers, and testing the DHCP function of the router.

Preferably, in step S300 of Embodiment 1, the test host may send a large number of DHCP Offer packets to the router under test in a cyclic sending manner.

Based on the same technical idea, the embodiment of the present invention also provides a system for simulating DHCP Offer flooding, and the system can execute the above method embodiment. The system for simulating DHCP Offer flooding provided by the embodiment of the present invention, as shown in FIG. And test host 30 is wired with described hub 40 respectively, and described test host 30 comprises: group package module 31, message transceiver module 32 and inspection judgment module 33, and described message transceiver module 32 is connected with described package respectively Module 31 and inspection judgment module 33 are connected, wherein:

The package module 31 of the test host 30 forms a DHCP Offer package;

The router 10 to be tested requests an IP address from the router 20 to be tested through the hub 40, and after the router 10 to be tested successfully obtains the IP address allocated by the router 20 to be tested, it disconnects during 1/2 of the lease period. Accompanied by testing the connection between the router 20 and the hub 40;

The message transceiver module 32 of the test host 30 sends a large amount of DHCP Offer packets formed by the group module 31 to the router 10 to be tested through the hub 40;

The inspection and judgment module 33 of the test host 30 judges whether the router 10 under test has obtained the source IP address in the DHCPOffer packet;

If the inspection and judgment module 33 of the test host 30 judges that the router under test 10 has obtained the source IP address in the DHCPOffer packet, then it is judged that the router under test 10DHCP function is abnormal;

If the inspection and judgment module 33 of the test host 30 judges that the router 10 under test does not obtain the source IP address in the DHCP Offer packet, the message transceiver module 32 of the test host 30 stops sending the DHCP Offer packet, Re-establish the connection between the accompanying test router 20 and the hub 40, and the inspection and judgment module 33 of the test host 30 further judges whether the described test router 10 can obtain the IP address sent by the accompanying test router 20, if so, the test The checking and judging module 33 of the host computer 30 judges that the DHCP function of the router under test 10 is normal; otherwise, the checking and judging module 33 of the testing host 30 judges that the DHCP function of the router under test 10 is abnormal.

This system saves test resources. In addition to testing this function, the environment can also perform protocol tests such as ARP and port vulnerability scanning tests. High efficiency, fixed test environment, simple and easy to understand, testers get started quickly. While ensuring the quality and efficiency of the test, it can also save laboratory resources, rationally allocate, and fix the test environment, which is conducive to ensuring the accuracy of the test results.

Preferably, the test host 30 in the above-mentioned embodiment also includes a setting module 34 connected to the message sending and receiving module 32, wherein: the setting module 34 of the test host 30 sets the router 10 Internet access mode to be DHCP, and Set the lease period of the accompanying router 20. Since this system is used to simulate DHCP Offer flooding for testing, it is generally sufficient to set the lease period to 1 minute. Setting the lease period too long will affect the test efficiency.

Preferably, the package module 31 of the test host 30 in the above-mentioned embodiment 1 forms a DHCPOffer package through xcap software. The xcap software is the inherent environment of the test protocol conformance function test bed. It has SOP reference documents. The simple operation allows testers to get started quickly. It has the advantages of easy control, resource reuse, and high efficiency.

Preferably, in the system for simulating DHCP Offer flooding in the above-mentioned embodiment, the router 10 to be tested requests an IP address from the accompanying router 20 through the hub 40, and the router 10 to be tested is to be successfully obtained the IP address. After the IP address assigned by the accompanying test router 20, disconnect the connection between the accompanying test router 20 and the hub 40 in 1/2 of the lease period; this process includes:

The router 10 to be tested sends a DHCP Discover message in broadcast mode, requesting to lease an IP address;

After the router for testing 20 receives the DHCP Discover message, it sends a DHCP Offer message to the router 10 under test, and the message includes that the router for testing 20 can provide to the router 10 for testing. IP address and the IP address of the accompanying test router 20 itself;

After the router 10 to be tested receives the DHCP Offer message, it sends a broadcast DHCP Request message, and adds the address of the accompanying router 20 and the router 10 to be tested in the option field of the DHCP Request message. The IP address of the application;

The accompanying test router 20 sends a response DHCP ACK message after receiving the DHCP Request message, and increases the use lease period information of the IP address applied for by the router to be tested 10 in the DHCP ACK message option field;

After the router 10 to be tested receives the DHCP ACK message, check whether the IP address distributed by the accompanying router 20 can be used, if so, the router 10 to be tested successfully obtains the selected IP address, and according to The IP address automatically initiates the continuation process using the lease period;

At the 1/2 moment of the lease period of the IP address acquired by the router 10 to be tested, the communication connection between the router 20 for testing and the hub 40 is disconnected, and the router 10 for testing will send a message to the router 20 for testing DHCP Request message to renew the IP address lease.

Preferably, on the basis of any of the above-mentioned embodiments, the message transceiver module 32 of the test host 30 sends a large amount of DHCP Offer packets to the router under test 10 through the hub 40, and the DHCP Offer packets include The source IP address provided to the router 10 under test. Cyclic sending of a large number of assembled DHCP Offer packets makes the effect of simulated flooding better.

In another embodiment of the present invention, the system of the present invention adopts the method of the present invention for testing, and the method of simulating DHCPOffer flooding is applicable to all routers. Mainly use xcap software to build manually

DHCP Offer package, when the router obtains the address, when it sends a DHCP Request within 1/2 of the lease period, it simulates the interference in the environment (a large number of DHCP Offer packages are sent out), to solve test problems such as whether the router will take the wrong address.

The basic, specific test flow chart is shown in Figure 5:

S501 builds the test environment: PC sets the router’s Internet access mode to DHCP, and the lease period of the accompanying test router is set to 1 minute. After the above settings are completed, connect the PC to the HUB. The specific environment topology is shown in Figure 4;

S502 Build a DHCP Offer package: modify the destination MAC (except ff:ff:ff:ff:ff:ff/01:00:5e:01:01:01) in the packet that has been assembled in the protocol conformance test environment It is the router LAN port MAC;

The S503 router obtains the address normally;

S504 Disconnect the network cable between the test router and the HUB: After the router obtains the address normally, disconnect the network cable between the test router and the HUB for 1/2 of the lease period (30s);

S505 sends a DHCP Offer packet: the protocol test PC cyclically sends a large number of DHCP Offer packets whose source IP is 192.168.1.170;

S506 Check the IP status of the router: check whether the router has obtained the address 192.168.1.170 in the offer packet; if yes, go to step S510, otherwise go to S507;

S507 Stop sending the DHCP Offer packet: if the router does not obtain the address 192.168.1.170 in the offer packet; the protocol test PC stops sending the DHCP Offer packet;

S508 reconnects the network cable between the test router and the HUB;

S509 checks the IP status of the router: check whether the router can obtain the address correctly, if so, go to S511, otherwise go to S510;

S510 judges that the DHCP function of the router is abnormal;

S511 judges that the DHCP function of the router is normal.

Compared with the best existing technology, the advantages of the present invention are:

Easy to control: Testers who don't know the test environment can test only by referring to the SOP document;

Reusable: Save test resources. In addition to testing this function, the environment can also perform ARP and other protocol tests, port vulnerability scanning tests, etc.;

High efficiency: The test environment is fixed, easy to understand, and testers can get started quickly.

While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the present invention also intends to include these modifications and variations.

Claims (10)

1. a kind of method that simulation DHCP Offer floods, which is characterized in that comprising steps of

S100, which tests host, sets up DHCP Offer packet, and the DHCP Offer packet is that counterfeit accompany of test host surveys router initiation Message；

S200 router to be measured surveys router solicitation IP address to described accompany by hub, successfully obtains to the router to be measured After getting the IP address for accompanying survey router distribution, at the 1/2 of the lease phase of the IP address accompanied and survey router distribution The separated connection accompanied between survey router and the hub；

Test host described in S300 sends the DHCP Offer packet largely set up to the router to be measured by the hub, The DHCP Offer packet includes the source IP address that the test host is supplied to the router to be measured；

Test host described in S400 judges whether the router to be measured obtains the source IP address in DHCP Offer packet, if It is then to enter step S500, otherwise enters step S600；

S500 judges the router DHCP dysfunction to be measured；

Test host described in S600 stops sending the DHCP Offer packet, and re-establishes described accompany and survey router and the collection Connection between line device judges that can the router to be measured obtain to accompany and surveys the IP address that router is sent, if so, entering step Rapid S700, otherwise enters step S500；

S700 judges that router DHCP function to be measured is normal.

2. a kind of method that simulation DHCP Offer floods according to claim 1, which is characterized in that further include:

It is DHCP that the net playing mode of router to be measured, which is arranged, in S010, and the lease phase for surveying router is accompanied described in setting；

S020 is by the test host and the hub wired connection, and the survey router and described accompany survey router difference With the hub wired connection, test environment is established.

3. a kind of method that simulation DHCP Offer floods according to claim 1, which is characterized in that the step S200 Comprising steps of

Router to be measured described in S210 issues DHCP Discover message in a broadcast manner, and IP address is rented in request；

After accompanying survey router to receive the DHCP Discover message described in S220, one is sent to the router to be measured DHCP Offer message surveys router and can distribute to IP address and the institute of the router to be measured in the message comprising described accompany State the IP address accompanied and survey router itself；

After the router reception to be measured DHCP Offer message described in S230, the DHCP Request report of a broadcast is issued Text, and accompany described in being added in the Option Field of the DHCP Request message and survey router address and described accompany surveys router point The IP address of router to be measured described in dispensing；

It accompanies to survey after router receives the DHCP Request message described in S240 and sends response DHCP ACK message, and described The use for surveying the IP address that router distributes to the router to be measured is accompanied to rent described in increasing in DHCP ACK message Option Field Contract period information；

After router to be measured described in S250 receives the DHCP ACK message, the IP address for surveying router distribution is accompanied to be described in inspection It is no to be able to use, if then the router to be measured successfully obtains the IP address accompanied and survey router distribution, and according to described IP address starts continuity process using the lease phase automatically；

S260 is surveyed at 1/2 moment of lease phase for the IP address that router distributes to the router to be measured in described accompany, and disconnects institute The communication connection accompanied and surveyed between router and the hub is stated, the router to be measured can survey router transmission to described accompany DHCP Request message re-rents IP address.

4. a kind of method that simulation DHCP Offer floods according to claim 1, which is characterized in that the step S100 Comprising steps of

Test host described in S110 sets up a large amount of DHCP Offer packets by xcap.

5. a kind of method that simulation DHCP Offer floods according to claim 1-4, which is characterized in that described Step S300 comprising steps of

Test host described in S310 cycles through the DHCP largely set up to the router to be measured by the hub Offer packet, the DHCP Offer packet include the source IP address for being supplied to the router to be measured.

6. a kind of system that simulation DHCP Offer floods characterized by comprising router to be measured accompanies and surveys router, test Host and hub, the router to be measured accompany and survey router and test host respectively with the hub wired connection, described Test host include: a group packet module, packet sending and receiving module and check judgment module, the packet sending and receiving module respectively with it is described Group packet module checks that judgment module is connected, in which:

The group packet module of the test host sets up DHCP Offer packet, and the DHCP Offer packet is to test that host is counterfeit accompanies survey The message that router is initiated；

The router to be measured, to survey router solicitation IP address is accompanied, is successfully obtained by the hub to the router to be measured After getting the IP address for accompanying survey router distribution, at the 1/2 of the lease phase of the IP address accompanied and survey router distribution The separated connection accompanied between survey router and the hub；

The packet sending and receiving module of the test host sends described group of packet module to the router to be measured by the hub The a large amount of DHCP Offer packet set up, the DHCP Offer packet include that the test host is supplied to the router to be measured Source IP address；

The inspection judgment module of the test host judges whether the router to be measured obtains in the DHCP Offer packet Source IP address；

If the inspection judgment module of the test host judges that the router to be measured obtains in the DHCP Offer packet Source IP address then judges the router DHCP dysfunction to be measured；

If the inspection judgment module of the test host judges that the router to be measured has not been obtained in the DHCP Offer packet Source IP address, then the packet sending and receiving module of the test host stops sending the DHCP Offer packet, re-establishes described accompany The connection between router and the hub is surveyed, the inspection judgment module of the test host further judges the road to be measured Can the IP address that survey router be accompanied to send be obtained by device, if so, the inspection judgment module judgement of the test host The router DHCP function to be measured is normal, and otherwise the inspection judgment module of the test host judges the router to be measured DHCP dysfunction.

7. a kind of system that simulation DHCP Offer floods according to claim 6, which is characterized in that the test host It further include the setup module being connected with the packet sending and receiving module, in which:

It is DHCP that the net playing mode of router to be measured, which is arranged, in the setup module of the test host, and accompanies survey to route described in setting The lease phase of device.

8. a kind of system that simulation DHCP Offer floods according to claim 6, which is characterized in that router to be measured is logical Hub is crossed to survey router solicitation IP address is accompanied, described accompany successfully is got to the router to be measured and surveys router distribution After IP address, at the 1/2 of the lease phase for accompanying the IP address for surveying router distribution, separated accompany surveys router and hub Between connection；Include:

The router to be measured issues DHCP Discover message in a broadcast manner, and IP address is rented in request；

Described accompany is surveyed after router receives the DHCP Discover message, sends a DHCP to the router to be measured Offer message surveys router and can distribute to the IP address of the router to be measured and described accompany in the message comprising described accompany Survey the IP address of router itself；

After the router to be measured receives the DHCP Offer message, the DHCP Request message of a broadcast is issued, and Survey router address and described accompany is accompanied to survey router point described in being added in the Option Field of the DHCP Request message The IP address of dispensing router to be measured；

It is described accompany to survey router and receive response DHCP ACK message is sent after the DHCP Request message, and in the DHCP Survey router is accompanied to distribute to believing using the lease phase for the IP address of the router to be measured described in increasing in ACK message Option Field Breath；

After the router to be measured receives the DHCP ACK message, the IP address for surveying router distribution is accompanied whether described in inspection It is enough to use, if then the router to be measured successfully obtains the IP address accompanied and survey router distribution, and according to the IP Location starts continuity process using the lease phase automatically；

It surveys at 1/2 moment of lease phase for the IP address that router distributes to the router to be measured in described accompany, is accompanied described in disconnection The communication connection between router and the hub is surveyed, the router to be measured can survey router transmission DHCP to described accompany Request message re-rents IP address.

9. a kind of system that simulation DHCP Offer floods according to claim 6, which is characterized in that the test host Group packet module pass through xcap set up DHCP Offer packet.

10. according to a kind of described in any item systems that simulation DHCP Offer floods of claim 6-9, it is characterised in that:

The packet sending and receiving module of the test host cycles through a large amount of establishments to the router to be measured by the hub DHCP Offer packet, the DHCP Offer packet includes to be supplied to the source IP address of the router to be measured.