[dhcwg] Prefix-length of an assigned address, in a DHCPv6 message (was: draft-dhcwg-dhc-rfc3315bis-02.txt)

[Alexandru Petrescu <[e-mail]>]

Le 07/08/2014 18:24, 神明達哉 a écrit :
> At Thu, 07 Aug 2014 17:07:33 +0200,
> Alexandru Petrescu <[e-mail]> wrote:
>
>> That aside, I wonder why programmers have set that 64 in the kernel data
>> absent a prefix length field in DHCP/RA, if not because of the fact that
>> specifications are lacking.  Were it for DHCPv6 to have a prefix length
>> field for assigned address A, then programmer would be clearer of what
>> to put on that field, I think.
>
> I guess you're basically re-raising a long standing discussion of
> whether to provide an on-link prefix via DHCPv6.
>
> My understanding is that we have never reached a consensus on this at
> IETF (consider, for example, how
> http://tools.ietf.org/html/draft-droms-dhc-dhcpv6-default-router-00
> was discussed and we still don't have any published outcome), so a
> simple rehash of it won't bring us anywhere.  At the very least it's
> safer to discuss it outside the scope of rfc3315bis (because otherwise
> we'll never be able to publish the bis).

Jinmei, thanks for the pointer.

But I wonder whether there is any draft that talks about how DHCPv6 
sends a prefix-length of the assigned IPv6 address, to the Client?  (not 
Prefix Delegation, but the equivalent of the Prefix Length field of a 
PIO of a Router Advertisement)?

Alex

>         } else {
>             /* Current practice is that all subnets are /64's, but
>              * some suspect this may not be permanent.
>              */
>             client_envadd(client, prefix, "ip6_prefixlen",
>                       "%d", 64);
                               ^ make this variable.

>
> --
> JINMEI, Tatuya
>
>