Link-local addresses are a type of IP address that are used for communication within a single network segment or link. They are primarily used in IPv6, but there are also link-local addresses in IPv4.
Key Features of Link-Local Addresses:
-
IPv6 Link-Local Addresses:
- They start with the prefix
fe80::/10. - These addresses are automatically configured on all IPv6-enabled interfaces.
- They are used for communication between devices on the same local network without the need for a router.
- Link-local addresses are not routable beyond the local link.
- They start with the prefix
-
IPv4 Link-Local Addresses:
- They are in the range
169.254.0.1to169.254.255.254. - These addresses are assigned automatically when a device cannot obtain an IP address from a DHCP server.
- Like IPv6 link-local addresses, they are used for local communication and are not routable on the internet.
- They are in the range
Usage:
- Devices use link-local addresses for tasks such as neighbor discovery, address autoconfiguration, and local communication.
- They are particularly useful in scenarios where a network connection is temporary or when devices need to communicate without a central management system.
In summary, link-local addresses facilitate local communication within a network segment, ensuring that devices can interact without requiring external routing.
