dhcpcd-discuss

Hi Shahid

On 10/02/17 15:37, Shahid Mahmood wrote:
> Hello Roy,
> Just a quick question on section 17.1.3 of RFC 3315. It states 3 options
> available to the client in order to select and Advertise message:
> 
> --- quote
> 
>    Upon receipt of one or more valid Advertise messages, the client
>    selects one or more Advertise messages based upon the following
>    criteria.
> 
>    -  Those Advertise messages with the highest server preference value
>       are preferred over all other Advertise messages.
> 
>    -  Within a group of Advertise messages with the same server
>       preference value, a client MAY select those servers whose
>       Advertise messages advertise information of interest to the
>       client.  For example, the client may choose a server that returned
>       an advertisement with configuration options of interest to the
>       client.
> 
>    -  The client MAY choose a less-preferred server if that server has a
>       better set of advertised parameters, such as the available
>       addresses advertised in IAs.
> 
> --- end quote
> 
> Specifically, when does client pick the last option:
> 
>    -  The client MAY choose a less-preferred server if that server has a
>       better set of advertised parameters, such as the available
>       addresses advertised in IAs.
> 
> Also, can application influence this choice (with parameter or something)?

Currently there is no preference selection available.
dhcpcd binds the first one received and keeps it. It does not change to
another lease as such.

Because dhcpcd can trivially remove the lease it applied, changing to a
new lease from a new server wouldn't be too onerous. How would you say
to prefer one over another?

Roy