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How is IPv6 link-local constructed?
The IPv6 Link Local addresses are made from the first 64-bit reservation (FE80::/64) and remaining bits are taken from the MAC address of the interface. But, MAC addresses are 48 bit numbers. 64+48 is only 112bits to form IPv6 address (IPv6 addresses are 128 bit in length).
How does link local work?
In computer networking, a link-local address is a network address that is valid only for communications within the network segment or the broadcast domain that the host is connected to.
Is there an IPv6 link local address like IPv4?
Many people get confused about IPv6 link-local addresses when they are first learning about IPv6 because there isn’t really any IPv4 equivalent of this type of IPv6 address. However, the only thing that comes close to IPv6 link-local addresses is the IPv4 Automatic Private IP Addressing (APIPA) method .
What do you need to know about ICMPv6 link local addresses?
After the host has gone through the Duplicate Address Detection (DAD) process ensuring that its link-local address (and associated IID) is unique on the LAN segment, it then proceeds to sending an ICMPv6 Router Solicitation (RS) message sourced from that address. Even routers use link-local addresses on each of their own interfaces.
Is the link local address in IPv6 deterministic?
Automatic address configuration of link-local addresses is often non-deterministic as the resulting address cannot be predicted. However, in IPv6 it is usually derived automatically from the interface media access control (MAC) address in a rule-based method.
Is there an IPv6 link-local multicast group address?
On the other hand, IPv6 doesn’t use the broadcast method of packet delivery so there is no equivalent IPv6 address type. IPv6 networks will never use broadcasts on a LAN. However, sending an IPv6 packet to the all-nodes link-local multicast group address (FF02::1) comes close to that functionality.