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Configuration Guide - IP Service

S2720, S5700, and S6720 V200R013C00

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DHCP policy VLAN, DNS, mDNS gateway, mDNS relay, UDP Helper, IP performance optimization, IPv6, DHCPv6, IPv6 DNS, IPv6 over IPv4 tunnel, and IPv4 over IPv6 tunnel.
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(Optional) Configuring the DHCPv6 Message Rate Limit and Alarm Function of DHCPv6 Messages Discarded

(Optional) Configuring the DHCPv6 Message Rate Limit and Alarm Function of DHCPv6 Messages Discarded

Context

To prevent clients from sending a large number of messages to attack the device, the device limits the rate of DHCPv6 messages.

After rate limit of DHCPv6 messages is enabled, the DHCPv6 messages are discarded when the rate threshold is exceeded. After the alarm function of DHCPv6 messages discarded is enabled, the device sends alarms when the number of discarded DHCPv6 messages exceeds the threshold.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run dhcpv6 packet-rate packet-rate

    Rate limit of DHCPv6 packets is enabled and the rate threshold is configured.

    By default, rate limit of DHCPv6 messages is disabled on the switch.

  3. Run dhcpv6 packet-rate drop-alarm enable

    The alarm function of DHCPv6 messages discarded is enabled on the device.

    By default, the alarm function of DHCPv6 messages discarded is disabled.

  4. Run dhcpv6 packet-rate drop-alarm threshold threshold

    An alarm threshold for the number of discarded DHCPv6 messages when the DHCPv6 message rate exceeds the rate threshold is set.

    By default, the alarm threshold is 100 when the alarm function of DHCPv6 messages discarded is enabled.

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Updated: 2019-04-20

Document ID: EDOC1100065678

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