HP 6125XLG R2306-HP 6125XLG Blade Switch Security Configuration Guide - Page 182
Configuration considerations, Configuration procedure, Configuring ARP packet rate limit
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Figure 61 Network diagram IP network Gateway Device ARP attack protection VLAN 10 VLAN 20 Host A R&D Host B Host C Office Host D Configuration considerations If the attack packets have the same source address, configure the ARP source suppression function as follows: 1. Enable ARP source suppression. 2. Set the threshold to 100. If the number of unresolvable IP packets received from a host within 5 seconds exceeds 100, the device stops resolving packets from the host until the 5 seconds elapse. If the attack packets have different source addresses, enable the ARP black hole routing function on the gateway. Configuration procedure # Enable ARP source suppression and set the threshold to 100. system-view [Device] arp source-suppression enable [Device] arp source-suppression limit 100 # Enable ARP black hole routing. [Device] arp resolving-route enable Configuring ARP packet rate limit The ARP packet rate limit feature allows you to limit the rate of ARP packets to be delivered to the CPU. For example, if an attacker sends a large number of ARP packets to an ARP detection enabled device, the device CPU is overloaded because all ARP packets are redirected to the CPU for inspection. As a result, the device fails to provide other functions or even crash. To solve this problem, you can configure ARP packet rate limit. 173
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