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s, 8 (Destination or Service Unreachable, ICMPv4 and ICMPv6 Messages, Time…
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Time Exceeded
When the Time to Live (TTL) field in a packet is decremented to 0, an ICMPv4 Time
Exceeded message will be sent to the source host
ICMPv6 also sends a Time Exceeded message. Instead of the IPv4 TTL field, ICMPv6 uses
the IPv6 Hop Limit field to determine if the packet has expired.
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ICMPv6 Messages
Messaging between an IPv6 router and an IPv6 device, including dynamic address allocation are as follows:
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Messaging between IPv6 devices, including duplicate address detection and address resolution are as follows:
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ICMPv6 has new features and improved functionality not found in ICMPv4, including four new protocols as part of the Neighbour Discovery Protocol (ND or NDP).
ICMPv6 Messages (Cont.)
• RA message can include addressing information for the host such as the prefix prefix length, DNS address, and domain name.
A host using Stateless Address Autoconfiguration (SLAAC) will set its default gateway to the link-local address of the router that sent the RA.
RA messages are sent by IPv6-enabled routers every 200 seconds to provide addressing information to IPv6-enabled hosts
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