Tech article
RFC8950: Announce IPv4 with an IPv6 next-hop
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Hacker News | Oct 16, 2026 | porridgeraisin
Automated excerpt
They still do things the old way but Backbone can run IPv6 only at its core. An IP transit backbone can run IPv6 only while exchanging IPv4 routes with its customers/peers/upstream over IPv6 sessions. RFC8950 extends this feature for IPv4 to have IPv6 next-hops. It originates 10. 0. 0. 0/24 to R1 over an IPv6 session. R1 & R2 are IPv6 only with no IPv4 anywhere on their interfaces (but carry IPv4 routes in their table)R3 has IPv6 with R2 but just IPv4 only with C2.
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