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Multiple IPv6 /64 Prefixs

In India it is currently not possible to get larger than a /64 IPv6 prefix from major ISPs. As an alternative you can request multiple /64s via DHCPv6 and use it in different VLANs.

Info

draft document

Last tested: June 1 2025 with ACT
Tested OS: OpenWRT, Microtik

How it works

  • ALL IPv6 traffic should be routed through your primary WAN's /128 IPv6 because it is authenticated via PPPoE/MAC?
  • Create any number of macvlans (which basically means another interface with different mac on the same interface)

Network Config - Example

OpenWRT:

  • YOU NEED TO ENABLE promecusous mode on the macvlan
  • It takes 5mins to get an IPv6 prefix
  • Disable source routing and default gateway on all macvlan interfaces