dhcpcd-discuss

Thanks Roy.
Could you please confirm if dhcpcd-7.0.0 supports RFC 8168?
https://tools.ietf.org/html/rfc8168

Thanks,
Shweta

On Sun, May 12, 2019 at 12:43 AM Roy Marples <roy@xxxxxxxxxxxx> wrote:

> Hi Shweta
>
> On 11/05/2019 18:16, Shweta Kalyani wrote:
> > Is there a way to hint in the DHCPv6 request the desired prefix length
> > that the client needs when requesting for IA_PD addresses?
>
> dhcpcd.conf(5) says this:
>       ia_pd [iaid [/ prefix / prefix_len] [interface [/ sla_id [/
> prefix_len [/
>               suffix]]]]]
>               Request a DHCPv6 Delegated Prefix for iaid.  This option
> must be
>               used in an interface block.  Unless a sla_id of 0 is assigned
>               with the same resultant prefix length as the delegation, a
> reject
>               route is installed for the Delegated Prefix to stop
> unallocated
>               addresses being resolved upstream.  If no interface is
> given then
>               we will assign a prefix to every other interface with a
> sla_id
>               equivalent to the interface index assigned by the OS.
> Otherwise
>               addresses are only assigned for each interface and sla_id.
>   Each
>               assigned address will have a suffix, defaulting to 1.  If the
>               suffix is 0 then a slaac address is assigned.  You cannot
> assign
>               a prefix to the requesting interface unless the DHCPv6 server
>               supports RFC6603 Prefix Exclude Option.  dhcpcd has to be
> running
>               for all the interfaces it is delegating to.  A default
> prefix_len
>               of 64 is assumed, unless the maximum sla_id does not fit.  In
>               this case prefix_len is increased to the highest multiple of
> 8
>               that can accommodate the sla_id.  sla_id is an integer
> which must
>               be unique inside the iaid and is added to the prefix which
> must
>               fit inside prefix_len less the length of the delegated
> prefix.
>               You can specify multiple interface / sla_id / prefix_len per
>               ia_pd, space separated.  IPv6RS should be disabled
> globally when
>               requesting a Prefix Delegation.
>
>
> So you could write this:
>
> interface eth0
>         ia_pd 1//56 eth1/1/64 eth2/2/64
>
> Hope this helps, and if you could suggest a wording change to the above
> so it's easie to read,  it would be appreciated!
>
> Roy
>