IPSG简介

IPS防护原理
本文介绍IP Source Guard (IPSG)的工作原理及其如何通过对比IP报文的源IP、源MAC等信息与绑定表来防御IP源欺骗攻击。合法用户的IP报文能够通过检查,而攻击者的虚假IP报文则被丢弃。
一.IPSG是IP Source Guard的简称。设备在作为二层设备使用时,利用绑定表来防御IP源欺骗的攻击。
IPSG功能是基于绑定表(DHCP动态和静态绑定表)对IP报文进行匹配检查。当设备在转发IP报文时将此IP报文中的源IP、源MAC、接口、VLAN信息和绑定表的信息进行比较,如果信息匹配,表明是合法用户,则允许此报文正常转发;否则认为是攻击报文,并丢弃该IP报文。

如:用户通过DHCP上线。上线后,Switch根据DHCP ACK报文生成用户的绑定表,绑定表包括用户的源IP、源MAC、端口、VLAN信息。当用户发送IP报文时,SwitchA查找此IP报文是否和该用户的绑定表匹配,如果是相同的,则允许报文通过,否则丢弃该IP报文。这样,合法用户发送的IP报文会被允许通过,而攻击者发送虚假的IP报文,无法匹配到绑定表,报文被丢弃,无法攻击其他用户。

文档链接http://support.huawei.com/hedex/hdx.do?lib=EDOC1000081668DZE0811M&lang=zh&v=06&tocLib=EDOC1000081668DZE0811M&tocV=06&id=dc_cfg_ipsg_1003&tocURL=resources%252fdc%252fdc%255fcfg%255fipsg%255f1003%252ehtml&p=t&fe=1&ui=3&keyword=%25u7279%25u6027&keyword=%25u5728%25u7f51&keyword=%25u6bd4%25u8f83&keyword=%25u7684&keyword=%25u7f51%25u7edc&keyword=%25u4ecb%25u7ecd&keyword=ipsg&keyword=%25u5176%25u4ed6&keyword=%25u4f4d%25u7f6e&keyword=%25u548c&keyword=%25u4ee5%25u53ca&keyword=%25u539f%25u7406&keyword=dai&keyword=%25u7528%25u5728&keyword=%25u5b89%25u5168&keyword=%25u76f8%25u5173&keyword=%25u4ed6&keyword=%25u5b9e%25u73b0&keyword=%25u9759%25u6001&keyword=%25u7aef%25u53e3&keyword=arp&keyword=%25u4e2d%25u7684&keyword=%25u5e94%25u7528&text=%253cfont%2520color%253d%2522%2523B60005%2522%253eIPSG%253c%252ffont%253e%253cfont%2520color%253d%2522%2523B60005%2522%253e%25u539f%25u7406%253c%252ffont%253e%25u63cf%25u8ff0&docid=EDOC1000081668

二.下图是关于信任接口和非信任接口的关系,较易懂:



<think>Hmm, the user just asked about "IPSG" without any context. That acronym could stand for many things depending on the field. Let me think... in networking, IPSG usually means IP Source Guard, a security feature. But it could also be International Pharmaceutical Students' Federation or other things. The user didn't specify, so I'll start with the most common technical meaning. The user seems to be in a hurry or maybe testing the system - such a short query. They might be a network engineer looking for quick info, or a student doing research. Since they requested Chinese responses, I'll keep everything in Chinese as instructed. For the mandatory questions section, I should pick aspects that would help someone new to IPSG: how it works, implementation steps, related features, and security benefits. These cover both theoretical and practical angles. I wonder if they'll follow up with more details about their actual use case. The response leaves room for them to clarify if they meant something else. Better keep it concise but precise - they clearly prefer direct answers. </think>IPSG(IP Source Guard)是一种网络安全技术,主要用于防御IP地址欺骗攻击(如ARP欺骗/DHCP欺骗)。其核心原理是通过**绑定IP-MAC-Port的对应关系**,过滤非法源IP数据包,确保网络设备只转发合法的流量。 ### 核心机制: 1. **动态绑定表生成** 通过监听DHCP报文或手动配置,交换机自动学习并存储合法用户的: - **IP地址** - **MAC地址** - **接入端口号** 2. **流量过滤** 对进入接口的非信任流量(如用户侧流量)进行校验: - 匹配绑定表:放行 - 无匹配或冲突:丢弃 ### 典型应用场景: ```plaintext +----------+ 非法流量拦截 +---------------+ | 攻击者 | ------------------> | 交换机 | | 伪造IP | (丢弃) | 启用IPSG | +----------+ | IP-MAC-Port表 | +---------------+ | 合法流量| v +---------------+ | 服务器/网络 | +---------------+ ```
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