4000 Router Series Security Configuration Guide

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Configuring ARP gateway protection

NOTE:

This feature is not supported in the current release, and it is reserved for future use.

Configure this feature on interfaces not connected with a gateway to prevent gateway spoofing attacks.

When such an interface receives an ARP packet, it checks whether the sender IP address in the packet is

consistent with that of any protected gateway. If yes, it discards the packet. If not, it handles the packet

correctly.

Configuration guidelines

Follow these guidelines when you configure ARP gateway protection:

• You can enable ARP gateway protection for a maximum of eight gateways on an interface.

• Do not configure both the arp filter source and arp filter binding commands on an interface.

• If ARP gateway protection works with ARP detection, ARP snooping, and ARP fast-reply, ARP

gateway protection applies first.

Configuration procedure

To configure ARP gateway protection:

Ste

Command

Remarks

1. Enter system view.

system-view N/A

2. Enter Layer 2 Ethernet interface

view.

interface interface-type

interface-number

N/A

3. Enable ARP gateway protection

for the specified gateway.

arp filter source ip-address

By default, ARP gateway

protection is disabled.

Configuration example

Network requirements

As shown in Figure 83, Host B launches gateway spoofing attacks to Switch B. As a result, traffic that

Switch B intends to send to Switch A is sent to Host B.

Configure Switch B to block such attacks.