SLAAC vs DHCPv6: Which One Actually Configures IPv6?
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IPv6 devices can assign themselves an IP address and find a gateway — no DHCP server
needed. Sounds perfect, right? There's just one problem: SLAAC can't find a DNS server.
Here's exactly what's missing from your IPv6 deployment, and how to fix it.
📌 In this video:
We break down how IPv6 auto-configuration actually works under the hood, starting with
NDP and its four core functions — Router Solicitation, Router Advertisement, Neighbor
Solicitation, and Neighbor Advertisement — and how they replace ARP using ICMPv6 and
multicast instead of broadcasting. We cover DAD (Duplicate Address Detection), EUI-64
interface ID generation, and why SLAAC gives devices a working IPv6 address and default
gateway but cannot provide DNS server information. That gap is exactly why DHCPv6
exists, and we explain both forms: stateless DHCPv6 (DNS-only, paired with SLAAC for
lightweight deployments) and stateful DHCPv6 (full IPv4-style address management with
the SARR message flow — Solicit, Advertise, Request, Reply — compared to IPv4's DORA).
⏱️ Chapters:
0:00 — The Hidden Risk of SLAAC
0:47 — IPv6 vs IPv4: What Still Applies
1:25 — NDP Replaces ARP: Here's How
1:47 — NDP Function 1: Router Solicitation
2:07 — NDP Function 2: Router Advertisement
2:15 — NDP Functions 3 & 4: Neighbor Discovery
2:48 — DAD: Preventing Duplicate IPv6 Addresses
3:08 — SLAAC, EUI-64 & the DNS Problem
3:59 — DHCPv6 Stateless vs Stateful Explained
4:54 — SARR vs DORA: Message Flow Compared
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#CCNA #IPv6 #DHCPv6 #SLAAC #NetworkingFundamentals