ipv6 autoconfiguration

This is concerning ipv6 autoconfiguration on a local segment where you don't have a router. From my understanding, the PCs assigns itself an IPv6 address (FE80...) and the PCs can communicate among them. So in order for a PC to communicate with another, it needs to know the other PC IPv6 address (FE80...). Correct?
If yes, then is there a way to discover those IPv6 addresses from a PC?

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Yes this is possible by using the solicited-node multicast address. Here is an article from wikipedia that described this.


Also here is a link from Cisco that goes over a similar question that you are asking that my be helpful. Look them over and let us know if you have any questions.


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leblancAccountingAuthor Commented:
Yes but the solicited-node multicast address assumes that you know the ipv6 local-link address but not the MAC address of the requested device. It's like address resolution. But my question is if you don't know the IPv6 local link addresses of other PCs on the local link, how will you communicate with them? Thx

PS. Thanks for the links though. Those links are very helpful.
I think I know what you are after now.

In order for a host to find other hosts on the local network they will send out Neighbor Solicitation messages to discover the link-layer address of on-link IPv6 nodes. These messages are sent to the multicast group of FF02::1, which all IPv6 hosts are required to listen to. Think of this address as being the that IPv4 hosts are required to listen and respond to.

After the Neighbor solicitation message is received a Neighbor Advertisement is sent in response. This will contain information such as the link-layer address of the sender, which will allow the host to learn of the link-layer address to be used for future communications.

Does this make sense?
leblancAccountingAuthor Commented:
Got it. Thanks
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