CN103237093A - Self-adaptive IP (internet protocol) address acquiring method - Google Patents

Abstract

The invention relates to a self-adaptive IP (internet protocol) address acquiring method. The self-adaptive IP address acquiring method includes: acquiring an IP address via a DHCP (dynamic host configuration protocol) manner; utilizing the IP address if the IP address is acquired; reading a preset IP address section if acquisition of the IP address fails; selecting an IP address within the IP address section; subjecting the selected IP address to ARP (address resolution protocol) conflict detection; and in case of conflict, returning to the step of randomly selecting an IP address within a static IP address section. By the self-adaptive IP address acquiring method, the IP address distributed by a DHCP server is utilized when the DHCP server is normal, and the IP address can be acquired when the DHCP server becomes invalid, so that the purpose for self-adaptively acquiring the IP address is achieved, conflict of the IP address is simultaneously avoided, and normal communication of users is guaranteed.

Description

A kind of self adaptation IP address acquiring method

Technical field

The present invention relates to the communications field, especially relate to a kind of self adaptation IP address acquiring method.

Background technology

What the present invention set forth is that equipment is (as VOIP, computer etc.) can self adaptation obtain the IP address approach, such as in local area network (LAN), be responsible for the server of dynamic assignment IP address and delayed machine, the equipment of all new accesses all can't get access to the IP address so, also just can't be with other device talks.In the case, equipment can be according to the static ip address section that pre-sets, at random or the IP in the order section of choosing as its own IP address, send the ARP address conflict simultaneously and detect, avoid multiple devices to set identical IP simultaneously and conflict.

A kind of " server uses the method for non static IP " disclosed in the prior art, see that publication number is: 1946045, open day be: 20070411 Chinese patent, describe server and should adopt static ip address, but can not use static address in some scene, use that dynamic IP addressing and address change situation under, how to notify client, allow the client re-register new address.

The present invention and patent 1946045 differences:

At first, the object of elaboration is had any different: the present invention is primarily aimed at liking client; And patent 1946045 at be server.

Secondly, application scenarios difference, the present invention be equipment under situation about obtaining less than dynamic IP addressing, can distribute static ip address to self automatically; Patent 1946045 is that server ip address changes, and how to notify client, guarantees to keep communicating by letter with client.

Again, the principle of realization is had any different: the present invention is that the IP address field that reads default static state obtains the IP address, carries out collision detection simultaneously; Patent 1946045 is that server ip changes, by communicate the IP address that notification server is new with the web server, client is by visit web server, the IP address that web server notification server is new, client connects to this IP address then, registration.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of self adaptation to obtain the method for IP address, under the situation that Dynamic Host Configuration Protocol server lost efficacy, can get access to the IP address.

The present invention is achieved in that and comprises the steps:

Step 10, use DHCP mode are obtained the IP address; If get access to the IP address, then use described IP address; If obtain the failure of IP address, then read default IP address field;

Step 20, in described IP address field, select an IP address;

Step 30, the ARP collision detection is carried out in the IP address of having selected; If the IP address of having selected is then used in not conflict; If conflict then turns back to step 20.

Further, in the step 20, described being chosen as at random selected.

The present invention has following advantage: under the situation that Dynamic Host Configuration Protocol server lost efficacy, read default IP address field, get access to the IP address, carry out collision detection again, avoided the problem of IP address conflict, assurance equipment can get access to the IP address and carry out normal communication.

Description of drawings

The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.

Fig. 1 is the inventive method flowchart.

Specific implementation method

With reference to Fig. 1, the scope of supposing Dynamic Host Configuration Protocol server distributing IP address in the network is 192.168.0.2-192.168.0.254, and when Dynamic Host Configuration Protocol server lost efficacy, the new equipment that inserts obtained the failure of IP address, then can't with network in other device talks.Use this method, during device start, at first enter step S101 and use the DHCP mode to obtain the IP address.Equipment enters step S102 and judges whether to obtain the success of IP address; If Dynamic Host Configuration Protocol server is normal, then equipment namely can get access to IP address (as 192.168.0.100), and equipment enters S107 and uses the IP address that has got access to; If Dynamic Host Configuration Protocol server is unusual, then get access to IP address failure (namely detecting the IP address is: 0.0.0.0 or automatic privately owned address), then equipment enters step S103 and reads default IP address field (as 192.168.0.10-192.168.0.250); Select an IP address at S104 in described IP address field subsequently, selection mode can be selective sequential or select at random, be made as here and select an IP address (as 192.168.0.59) at random; Enter step S105 the ARP collision detection is carried out in the IP address of having selected (192.168.0.59); Judge whether conflict at S106, if not conflict then enters S107 and uses the IP address (192.168.0.59) that has got access to; If conflict then turns back to step S104 and selects at random again.Use this method, just often use the Dynamic Host Configuration Protocol server IP address allocated at Dynamic Host Configuration Protocol server, when Dynamic Host Configuration Protocol server loses efficacy, also can get access to the IP address, realized that self adaptation obtains the purpose of IP address, the normal communication of assurance equipment.

Though more than described specific implementation method of the present invention; but being familiar with those skilled in the art is to be understood that; our described specific embodiment is illustrative; rather than for the restriction to scope of the present invention; those of ordinary skill in the art are in modification and the variation of the equivalence of doing according to spirit of the present invention, all should be encompassed in the scope that claim of the present invention protects.

Claims (2)

1. a self adaptation IP address acquiring method is characterized in that: comprise the steps:

Step 10, use DHCP mode are obtained the IP address; If get access to the IP address, then use described IP address; If obtain the failure of IP address, then read default IP address field;

Step 20, in described IP address field, select an IP address;

Step 30, the ARP collision detection is carried out in the IP address of having selected; If the IP address of having selected is then used in not conflict; If conflict then turns back to step 20.

2. a kind of self adaptation IP address acquiring method according to claim 1 is characterized in that: in the step 20, described being chosen as at random selected.

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