Method and device for making automatic avoidance of illegal DHCP service and DHCP server

Abstract

The invention discloses a method and a device for enabling illegal DHCP service to be invalid automatically; the method includes that a DHCP server maintains a legal DHCP server list, broadcasts DHCP Discover messages periodically and identifies received DHCP response messages; if a node which sends DHCP response message is not in the legal DHCP server list, the node is an illegal DHCP server, and DHCP message interception is started; if the destination address sent by a client is intercepted that the destination address is the DHCP Request message of the node, a DHCP request failure message is sent to the client. The invention also discloses a DHCP server. The invention effectively reduces the work load of network administrator and effectively prevents illegal DHCP server from providing DHCP service in time.

Description

technical field [0001] The invention relates to the technical field of communication networks, in particular to a method and a device for automatically invalidating illegal DHCP services, and also to a DHCP server. Background technique [0002] With the continuous expansion of network scale and the improvement of network complexity, the number of computers often exceeds the number of IP addresses available for allocation; at the same time, with the widespread use of mobile PCs and wireless networks, the location of computers often changes, and the corresponding The IP address must also be updated accordingly. [0003] In order to solve the above problems, DHCP (Dynamic Host Configuration Protocol, Dynamic Host Configuration Protocol) can be used to automatically assign parameters such as computer IP addresses and gateways. Configuration application, the DHCP server returns configuration information such as the IP address assigned to it to the client, thereby realizing the d...

AI Technical Summary

Problems solved by technology

[0007] 1. Since both legal DHCP servers and illegal DHCP servers are recorded in the log information, the network administrator needs to check them one by one, resulting in a huge workload;

[0008] 2. Network adjustments must be manually performed by network administrators after identifying illegal DHCP servers. Since the possibility of immediate discovery and immediate processing by network administrators after an illegal DHCP server appears is basically non-existent, in most cases, in the network Before the administrator made network adjustments, the illegal DHCP server had provided wrong IP addresses to some DHCP clients, which made these clients unable to use the network normally;

[0009] 3. The existing DHCP server detection function only performs a log record for each DHCP server. If the only record is lost in the process of sending to the log server, the network administrator will not be able to know the existence of the illegal DHCP server, so there is a reliable sexual problems

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