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Re: [DNA] RE: Review of draft-krishnan-dna-simple-01.txt

Dear Bernard

thanks for your comments.

> > 1. Assumption
> > The draft seems to assume the following w.r.t prefix advertisement.
> >
> > 1) All routers on the link advertise the same prefixes.
>
>  [BA] No.  It is possible to send multiple NS so that this assumption is not
> required.

Multiple NSs won't correct the wrong DNA decision from RAs with
disjoint prefix lists. An NS/NA based DNA decision is overruled by RA
based DNA decision. Upon receiving an RA with  no known prefix, a host
will assume a link change even if NS/ NA exchange indicates no link
change.

> > 2) It's out of scope how routers would synchronize their advertisement.
> >
> > Do I understand right?
> >
> > 2. Link identification.
> > The draft seems to check for link change as below.
> >
> > 1) Upon receiving link-layer indication,
> > a host would send an RS and an NS simultaneously.
>
>  [BA] Yes.

ok.

> > 2) If the host receives a solicited NA from a known node
> > of a previously attached link,
> > the host assumes it still remains in the same link.
>
>  [BA] Yes -- unless the RA provides different information.

ok.

> > 3) If the host receives a solicited RA with a known prefix
> > of a previously attached link,
> > the host assumes it still remains in the same link.
> > Otherwise, i.e. the host receives no known prefix in the RA,
> > the host assumes it moved to a different link.
>
>  [BA] There is also the possibility that DHCPv6 is in use, in which
>  case 2) can confirm the validity of an IPv6 address whose lease has
>  not yet expired.

ok.

> > 4) When 2 & 3 give conflicting answers, 3's decision is definite.
>
>  [BA] Correct -- except for DHCPv6 case, where 2) may confirm
>  the validity of a previously assigned address, but 3) may indicate
>  the need to send a DHCPv6 request.   As before if the DHCPv6
>  assigned address conflicts with the address determined in 2),
>  then DHCPv6 wins.

ok.

Thanks for your kind consideration.

best regards

JinHyeock