Method, device and system for acquiring IP address of network interconnection protocol

Abstract

The present application proposes a network interconnection protocol IP address acquisition method, device and system, including: acquiring the DHCP discovery message sent by the Dynamic Host Configuration Protocol (DHCP) client for processing, wherein the processing process includes: acquiring the IP address recorded in the configuration file The IP network segment planned for the subnet where the DHCP client is located, fills the agent IP field in the DHCP discovery message according to the acquired IP network segment; reports the DHCP discovery message after the processing operation to the DHCP server ; receiving a DHCP response message carrying a dynamic IP address assigned to the DHCP client computer issued by the DHCP server for the DHCP discovery message, wherein the dynamic IP address is determined by the DHCP server according to the The proxy IP field in the DHCP discovery message is determined; based on the destination MAC address in the DHCP response message, the DHCP response message is forwarded to the DHCP client.

Description

technical field [0001] The present invention relates to the relay application field of DHCP (Dynamic Host Configuration Protocol, dynamic host configuration protocol), in particular to a network interconnection protocol IP address acquisition method, device and system. Background technique [0002] Using the DHCP Relay (DHCP relay, or DHCP relay agent) of the switch can remove the need for a DHCP server in each physical network segment, so that the DHCP client that is not in the same physical network segment as the DHCP server can also dynamically apply for it. IP address, the switch at this time can be called a DHCP relay device. In related technologies, the DHCP Relay has an IP address (called server-side IP address) that can communicate with the DHCP server on the switch, and sets the server IP address as the target-ip (destination IP) address of the relay At the same time, there must also be an IP address on the switch that can communicate with the DHCP client (called t...

AI Technical Summary

Problems solved by technology

[0006] Since the client side IP address of the switch is exposed to the DHCP client, the DHCP client can directly access the switch and even the DHCP server (if the DHCP Relay device supports Layer 3 forwarding), in this case, the switch and the DHCP server are easily There is a great risk of being attacked by lower-end DHCP client devices

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