Hi @Matthi17 

Thanks for posting in our business forum.

IPv6 link-local addresses are used within a single network segment and are not routed to other networks. Link-local addresses are crucial for the local communication of network devices, especially when there is no DHCP server to assign addresses, and devices need to configure their own addresses automatically. The format of IPv6 link-local addresses is as follows:

• Prefix: Link-local addresses always start with the prefix fe80::/10, meaning the first 10 bits are fixed to 1111 1110 10.
• The next 54 bits are typically set to 0, though this is not mandatory. In total, the first 64 bits include the fe80:: prefix.
• The last 64 bits are the Interface Identifier, which is usually derived from the physical address (MAC address) of the network interface.