IPv6
IPv6 is the next-generation IP protocol using 128-bit addresses and improved network features.
Updated: 2026-03-05
Definition
IPv6 provides a vastly larger address space than IPv4 and includes features like simplified headers and neighbor discovery.
Many networks run dual-stack (IPv4 + IPv6) during migration.
Key points
- 128-bit addressing (hex)
- Uses Neighbor Discovery instead of ARP
- Common scopes: global, link-local
Common mistakes
- Ignoring IPv6 security (it can bypass IPv4-only controls).
- Misunderstanding link-local addressing and default gateways.
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