IPv6 dual-stack

Google and Netflix penalize providers without native IPv6. ISPs running only IPv4 + CGNAT fall behind — in perceived quality and in IPv4 cost.

What IPv6 is

IPv6 is the next-generation Internet Protocol, with 128-bit addresses (vs. IPv4's 32 bits). Solves IPv4 scarcity, simplifies configuration (SLAAC, no NAT), reduces latency on routes optimized by large platforms.

In Brazil, over 50% of Google and Netflix traffic is already IPv6 when subscriber supports it. Without IPv6, end customers fall back to IPv4+CGNAT, with more latency and jitter — and the ISP gets blamed for it.

What RASYS does with IPv6

  • Collection and organization of the technical data for the LACNIC pool request — technical justification and usage plan (the formal submission to LACNIC stays with the ISP's admin).
  • Addressing plan — split per PoP, per customer type (residential, corporate, internal infra), with room for expansion.
  • IPv6 BGP — sessions with upstreams and at IX.br, with RPKI also for IPv6.
  • Dual-stack PPPoE — delivery of /56 or /60 per subscriber via DHCPv6-PD alongside IPv4. Works on MikroTik, Huawei, Juniper, Cisco.
  • Updated RADIUS — Framed-IPv6-Prefix, Delegated-IPv6-Prefix attributes in profiles. Integration with MK-Auth, IXC, SGP, Voalle.
  • IPv6 DNS — recursor with AAAA, glue records in authoritative, reverse ip6.arpa.
  • CGNAT reduction — as traffic migrates to IPv6, the IPv4 pool eases. In 1-2 years, you can postpone buying a new IPv4 block.

Equipment we work with

Huawei, Juniper, Cisco, MikroTik routers. Huawei, ZTE, FiberHome, Datacom ONUs. FreeRADIUS, integrations with common Brazilian ISP managers.

When it makes sense to talk to us

You don't have a LACNIC ASN or IPv6 pool yet; paying a lot for IPv4 and want to reduce; customers complain about Netflix/games lagging; want to join IX.br with IPv6 too.

Talk to us. See also: CGNAT, BGP, IPv6 in glossary.

FREQUENTLY ASKED QUESTIONS

How long does it take to deploy IPv6 dual-stack for an ISP with 5,000 subscribers?

Four to twelve weeks, depending on the state of the network. Most of the time is spent validating by region and CPE model — older equipment that does not support IPv6 becomes a backlog item. Backbone configuration, BGP IPv6, and B-RAS setup is fast (1-2 weeks).

What size IPv6 block do we get from LACNIC?

An LIR ISP gets an initial /32 (4 billion /64s available). For residential clients, we delegate /56 (256 subnets) or /60 (16 subnets). Do not delegate /64 to the client — it will limit you with no benefit.

How do you deliver IPv6 to PPPoE clients — does Prefix Delegation work with any CPE?

PPPoE with IPv6CP + DHCPv6 PD works on decent ONUs/CPEs from the last 4-5 years. Very old CPE (pre-2018 operator models) may not support PD — those stay IPv4-only until natural replacement. We validate per model and adjust the B-RAS config to negotiate correctly.

Does IPv6 reduce the need for CGNAT in practice?

It significantly reduces the traffic that needs to traverse CGNAT, but does not eliminate it while IPv4 Internet still exists. With dual-stack, 60-70% of traffic (Google, Netflix, Facebook, YouTube) goes over native IPv6. CGNAT is still needed for the remaining IPv4, but the pool lasts much longer.