ipv6 icmp send

Function

The ipv6 icmp send command enables the system to send ICMPv6 packets.

The undo ipv6 icmp send command disables the system from sending ICMPv6 packets.

By default, the system is enabled to send ICMPv6 packets.

Format

ipv6 icmp { icmpv6-type icmpv6-code | icmpv6-name | all } send

undo ipv6 icmp { icmpv6-type icmpv6-code | icmpv6-name | all } send

Parameters

Parameter	Description	Value
icmpv6-type	Specifies the type of ICMPv6 packets.	The value is an integer that ranges from 0 to 255.
icmpv6-code	Specifies the code of ICMPv6 packets.	The value is an integer that ranges from 0 to 255.
icmpv6-name	Specifies the name of ICMPv6 packets.	ICMPv6 packets are classified into the following types: echo: Echo packet echo-reply: Echo Reply packet err-header-field: Packet with an error header frag-time-exceeded: Fragmentation Timeout packet hop-limit-exceeded: Packet whose hop count exceeds the limit host-admin-prohib: Packet that is rejected by a host host-unreachable: ICMPv6 Host Unreachable packet neighbor-advertisement: Neighbor Advertisement packet neighbor-solicitation: Neighbor Solicitation packet network-unreachable: ICMPv6 Network Unreachable packet packet-too-big: Packet Too Big packet port-unreachable: ICMPv6 Port Unreachable packet redirect: Redirected packets router-advertisement: Router Advertisement packet router-solicitation: Router Solicitation packet unknown-ipv6-opt: Error packet with unknown options unknown-next-hdr: Error packet with unknown next header
all	Indicates all ICMPv6 packets.	-

Views

System view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

When the network is in good performance, routing devices can send or receive ICMPv6 packets. However, when network traffic load is heavy, host unreachable or port unreachable events frequently occur, the routing devices send a large number of ICMPv6 packets, which burdens the network and degrades the performance of the routing devices. In addition, attackers may use ICMPv6 error packets to probe the internal network topology.

To improve network performance and security, run the undo ipv6 icmp send command to disable the system from sending ICMPv6 packets.

Precautions

When the network is in good performance again, you can run the ipv6 icmp send command to enable the system to send ICMPv6 packets.

Example

# Disable the system from sending all ICMPv6 packets.

<HUAWEI> system-view
[HUAWEI] undo ipv6 icmp all send