[v6ops] Re: [dhcwg] Re: Re: [IPv6]Re: Android now supports DHCPv6 PD

[Ivan Pepelnjak <[e-mail]>]

Let’s not forget the basics: every route needs a next-hop address, and in the IPv6-only world, that needs to be an IPv6 address. Whether it’s a GUA or LLA, and whether it’s assigned from the on-link prefix or something else, is irrelevant from the ND cache perspective.

You will always have ND cache entries for every device attached to a LAN segment; it’s just the question of how many entries per device you have. Would love to hear what exactly Android does in various scenarios.

Ivan

> On 19 Sep 2025, at 07:20, Mikael Abrahamsson <swmike=[e-mail]> wrote:
> 
> On Thu, 18 Sep 2025, Owen DeLong wrote:
> 
>> Don’t you still need some form of on-net address outside of the delegated prefix to communicate with the delegated router? I suppose link local alone is technically sufficient for that, but you’ll still need an ND entry for that, so I don’t see a gain from making trace routes ugly just to avoid an address assignment. 
> 
> "unnumbered WAN" has been a thing for 10-15 years, ie you don't have an address on your uplink, you assign yourself address from the PD, for instance RFC7084 WAA-7 and WAA-9. End devices should support this as well.
> 
> -- 
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