Mikael,

>>>>> Your document describes (in my opinion) desireable behaviour for devices 
>>>>> going forward. I would like to see text for DHCPv6 as well, both IA_NA 
>>>>> and IA_PD, if the same kind of behaviour can work there somehow. This is 
>>>>> out of scope for homenet though.
>>>> 
>>>> the rule applies regardless of how the addresses have been assigned.
>>> 
>>> Yes, but how will the router signal that it'll handle addresses for a 
>>> certain prefix, for instance a /56 from where DHCPv6 IA_NA and IA_PD is 
>>> being assigned, but that isn't onlink?
>>> 
>>> Advertising that /56 as an off-link prefix hasn't historically said "I'll 
>>> handle Internet traffic for source addresses within all prefixes that I 
>>> announce, both offlink and on-link". Perhaps we can say that it does, but 
>>> it's not obvious to me that there are no corner cases for this that'll 
>>> break things.
>> 
>> the rule we are proposing is something like:
>> “In SA, DA, NH selection, prefer the NH that has advertised a PIO covering 
>> the SA”
> 
> Check. And PIO here can be RIO as well?

no, I don’t think it can. the RIO says nothing about the link itself.

> What about if there are several PIO/RIOs of different size, do we do longest 
> matching on them to prefer one? Or shortest because the guy with the shortest 
> prefix (not /0) is more likely to be the one closest to the uplink?

two PIO’s of different length on the link sounds like a configuration error.

>> can you construct an example where the rule breaks things and that not 
>> having the rule wouldn’t?
> 
> No, I am still trying to figure out exactly what is being proposed. Next step 
> is to try to come up with something that'll make things break.

good. ;-)

cheers,
Ole

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