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8-2
IPv6 Diagnostic and Troubleshooting
Introduction
Introduction
The IPv6 ICMP feature enables control over the error and informational
message rate for IPv6 traffic, which can help mitigate the effects of a Denial-
of-service attack. Ping6 enables verification of access to a specific IPv6 device,
and traceroute6 enables tracing the route to an IPv6-enabled device on the
network.
ICMP Rate-Limiting
ICMP rate-limiting controls the rate at which ICMPv6 generates error and
informational messages for features such as:
■ neighbor solicitations
■ neighbor advertisements
■ multicast listener discovery (MLD)
■ path MTU discovery (PMTU)
■ duplicate address discovery (DAD)
■ neighbor unreachability detection (NUD)
■ router discovery
■ neighbor discovery (NDP)
ICMPv6 error message generation is enabled by default. The rate of message
generation can be adjusted, or message generation can be disabled.
Feature Default CLI
IPv6 ICMP Message Interval and
Token Bucket
100 ms
10 max tokens
8-3
ping6 Enabled
traceroute6 n/a