Which two ICMPv6 messages are used in SLAAC?
The two ICMPv6 messages used in Stateless Address Autoconfiguration (SLAAC) are:
1. Router Advertisement (RA): This message is sent by routers periodically to announce their presence on the network and to provide network configuration parameters, including the prefix and the prefix length. The RA message enables hosts to automatically configure their IP addresses using the prefix information. The RA message also includes a flag called the “A” bit (Address Autoconfiguration flag), which indicates whether hosts should use SLAAC to generate their own IPv6 addresses.
2. Neighbor Solicitation (NS): This message is used by a host to determine if a specific IPv6 address is already in use by another device on the network. When a host generates its own IPv6 address using SLAAC, it sends a Neighbor Solicitation message to verify if the address is already in use. If it receives a Neighbor Advertisement (NA) message in response to the NS message, it knows that the address is already taken, and it needs to choose a different address.
Together, these two ICMPv6 messages facilitate the automatic configuration of IPv6 addresses in a network using SLAAC.
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