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13.1 - Coggle Diagram
13.1
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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).
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ICMPv6 Messages (Cont.)
To check the uniqueness of an address, the device will send an NS message with its own IPv6 address as the targeted IPv6 address.
If another device on the network has this address, it will respond with an NA message notifying to the sending device that the address is in use.
A device assigned a global IPv6 unicast or link-local unicast address, may perform duplicate address detection (DAD) to ensure that the IPv6 address is unique.
DAD is not required, but RFC 4861 recommends that DAD is performed on unicast addresses.
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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 (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
ICMPv6 Messages (Cont.)
• In the figure, R1 sends a NS message to 2001:db8:acad:1::10 asking for its MAC address
The message will include the known (targeted) IPv6 address. The device that has the targeted IPv6 address will respond with an NA message containing its Ethernet MAC address.
To determine the MAC address for the destination, the device will send an NS message to the solicited node address.
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