A method for binding IP-MAC to gateway DHCP server side and gateway DHCP server side

Abstract

The invention discloses a method for binding IP-MAC to a gateway DHCP server side and a gateway DHCP server side. The DHCP server side in the method maintains a binding list: S1, determining whether the IP-MAC address couples in the binding list exist in the present distribution information of the DHCP server side or not, unbinding the IP-MAC address couples existing in the binding list but not existing in the present distribution information, and deleting the IP-MAC address couples from the binding list; S2, determining whether the IP addresses in the present distribution information exist in the binding list or not, binding the IP addresses existing in the present distribution information but not existing in the binding list with the corresponding MAC addresses, and adding the bound IP-MAC address couples to the binding list. The method and the gateway DHCP server side can automatically realize the binding of the IP-MAC address couples and regular maintenance on the gateway DHCP server side.

Description

technical field [0001] The present invention relates to a binding technology of IP (a 32bit address assigned to each device connected to the Internet)-MAC (physical address, used to define the location of network devices) address pairs, in particular to a gateway A DHCP (Dynamic Host Configuration Protocol, Dynamic Host Configuration Protocol) server binding method for IP-MAC and a gateway DHCP server capable of implementing the method. Background technique [0002] ARP (Address Resolution Protocol, Address Resolution Protocol, used to realize the MAC address of the device through the IP address) attack is a common attack method in the local area network, which sends ARP spoofing information to the local area network through the attack source, thus making the local area network The IP-MAC information cached in the computer in the computer is wrong, causing the computer to fail to send the data packet to the gateway; or the IP-MAC information at the gateway is wrong, causing ...

AI Technical Summary

Problems solved by technology

However, in the network of public places, especially in the network of public places such as hotels, restaurants or airports, the mobility of network users is extremely high, so for each IP address, the MAC address of the corresponding network device Both are not fixed, so it is obviously impossible for the network administrator to manually bind the constantly changing IP-MAC address pair at the gateway

Even if it is assumed that in extreme cases, each user informs the network administrator of the MAC address of his network device, allowing him to manually bind the IP-MAC address pair at the gateway, but when any user is offline, the network The administrator must manually unbind the corresponding IP-MAC address pair. When considering the great mobility of users, such manual binding is obviously unrealistic

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