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CLI-based Configuration Guide - Security

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010

This document provides the basic concepts, configuration procedures, and configuration examples in different application scenarios of the network management feature supported by the device.
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Defense Against Bogus DHCP Server Attacks

Defense Against Bogus DHCP Server Attacks


Because DHCP servers and DHCP clients lack authentication mechanisms between them, each DHCP server newly configured on a network assigns IP addresses and other network parameters to DHCP clients. If the assigned IP addresses and other network parameters are incorrect, errors may occur on the network.

In Figure 13-2, authorized and unauthorized DHCP servers can receive DHCP Discover messages broadcast by DHCP clients.

Figure 13-2  DHCP client sending DHCP Discover messages

If a bogus DHCP server sends a bogus DHCP Reply message with an incorrect gateway address, Domain Name System (DNS) server address, or IP address to a DHCP client, as shown in Figure 13-3, the DHCP client cannot obtain the correct IP address and required information. The authorized user then fails to access the network and user information security is compromised.

Figure 13-3  Bogus DHCP server attack


To prevent attacks from a bogus DHCP server, configure the trusted interface and untrusted interfaces on the device.

You can configure the interface directly or indirectly connected to the authorized DHCP server as the trusted interface and other interfaces as untrusted interfaces. The device then discards DHCP Reply messages received on untrusted interfaces, preventing bogus DHCP server attacks, as shown in Figure 13-4.

Figure 13-4  Trusted interface and untrusted interfaces
Updated: 2019-08-07

Document ID: EDOC1100034077

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