接入控制器中基于Netfilter的防范DDOS攻击策略研究

Study on Netfilter-based strategy for preventing DDOS attacks in access controllers

DDOS(分布式拒绝服务)是一种常见的、破坏力强的网络攻击,为了减小其对网络设备的影响,提出一种在接入控制器中基于Netfilter的防范DDOS攻击的策略。结合改良的SYN Cookie(标识握手信号的本地数据)技术,对Linux内核中的Netfilter进行二次开发,实现了针对DDOS中SYN Flood(标识握手信号的洪水攻击)方式的防火墙。测试结果表明:该方案能够有效地防止网络攻击,以较小的性能损失保证TCP(传输控制协议)服务的正常工作,并节约了成本。

Distributed Denial of Service （DDOS）is a common and destructive network attack.In order to minimize its impacts on network equipment,this paper presents a Netfilter-based strategy for preventing DDOS attacks on access controllers.Using the improved SYN Cookie technology,it executes a secondary development of Netfilter in the inner core of Linux,realizing a firewall against SYN Flood in DDOS.Test results indicate that this scheme effectively prevents network attacks,ensures the normal service of TCP with little performance loss and saves cost.