The Everything Feed - All Packet Pushers Pods IPB175: IPv6 Basics – Link-Local Addresses
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May 15, 2025 Dive into the world of IPv6 link-local addresses! Discover how these unicast addresses facilitate communication without the need for a router. Learn about self-provisioning, duplicate address detection, and their critical role in local networks. The discussion covers their significance in routing protocols and troubleshooting. Plus, explore the nuances of configuration, filtering practices, and the differences between link-local and deprecated addresses. It's a fascinating look at the backbone of modern networking!
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Link-Local Address Space Explained
- Link local addresses have a large reserved address space of FE80::/10, but are practically implemented as FE80::/64.
- This large reservation allows for future expansions or new kinds of link local scoping.
Link-Local Auto-Configuration Role
- Hosts self-provision link local addresses for each interface to communicate locally without a router or global IP.
- Duplicate Address Detection ensures unique interface identifiers despite the same FE80:: prefix reuse across interfaces.
Teaching Link Local IPv6
- Nick Baraglio used to teach IPv6 workshops emphasizing link local as "IPv6 you have when you don't have IPv6."
- This statement helped students question and understand the utility of link local addresses.