Hello James:

Thank you for your submission, we will take it into consideration for a future release.  Whatever the outcome of our analysis, we will update you via this ticket.

We value user contributions highly and will try to have a disposition for you in the near future.  As a small, non-profit we have to commit our resources carefully and ask for your patience in awaiting a disposition.

Sincerely,

Thomas Markwalder
ISC Software Engineering

On Wed Aug 08 18:56:03 2018, jim.list@hotmail.com wrote:
> While trying to add multiple MPL parameters (RFC-7774) I found that
> isc-dhcp v6 does not support multiple entries of an option per the
> DHCPv6 method.  In DHCPv4 options would be concatenated as an array of
> option parameters instead of separate instances of the option as
> required by DHCPv6 (RFC-7227 Ch 16 & RFC-3315 Ch 22).
> 
> 
> I propose adding support for multiple instances of DHCPv6 options
> using the "append" keyword.
> 
> 
> Attached is a patch that works with the below example.conf but perhaps
> there is a cleaner patch as I don't have a full understanding of how
> the option cache is constructed and laid out and how the options
> parsing is performed (multiple passes?).
> 
> 
> sample dhcpv6.conf
> 
> # MPL Parameter Configuration Option (RFC-7774)
> # MPL Default Parameters Option 104
> option dhcp6.mpl-default-parameters code 104 = {
>     unsigned integer 8,     # flags, 0x80 - proactive
>     unsigned integer 8,     # tunit
>     unsigned integer 16,    # se_lifetime
>     unsigned integer 8,     # dm_k
>     unsigned integer 16,    # dm_imin
>     unsigned integer 8,     # dm_imax
>     unsigned integer 16,    # dm_t_exp
>     unsigned integer 8,     # c_k
>     unsigned integer 16,    # c_imin
>     unsigned integer 8,     # c_imax
>     unsigned integer 16     # c_t_exp
> };
> 
> # MPL Domain Parameters Option 104
> option dhcp6.mpl-domain-parameters code 104 = {
>     unsigned integer 8,     # flags, 0x80 - proactive
>     unsigned integer 8,     # tunit
>     unsigned integer 16,    # se_lifetime
>     unsigned integer 8,     # dm_k
>     unsigned integer 16,    # dm_imin
>     unsigned integer 8,     # dm_imax
>     unsigned integer 16,    # dm_t_exp
>     unsigned integer 8,     # c_k
>     unsigned integer 16,    # c_imin
>     unsigned integer 8,     # c_imax
>     unsigned integer 16,    # c_t_exp
>     ip6-address             # MPL Domain
> };
> 
> # The standard ISC-DHCP server does not support multiple DHCPv6 options
> # with
> # the same code and only the last "option" specified with a code is
> # saved.
> #
> # The ISC-DHCP client (which uses the same configuration option parser)
> # supports "prepend" and "append" options to override or add defaults
> # for
> # options.  The parser does this by concatenating the additional
> # configurations
> # as array members to an option as supported in DHCPv4.
> #
> # RFC-7227 Ch 16 describes expected format for non-singleton options.
> # RFC-3315 Ch 22 states an option appearing multiple times must be a
> # separate
> # instance and MUST NOT be concatenated.
> #
> # A patched version of the ISC-DHCP server is required to support the
> # following
> # dhcpv6 options as separate instances.
> option dhcp6.mpl-default-parameters 0x80 100   18000 1 1    3   3   1
> 1    9   10;
> # payload delay sensitive domain parameters
> append dhcp6.mpl-domain-parameters  0x80 100   18000 4 5    16  3   4
> 20   16  2  ff03::153;
> # delay insensitive domain parameters
> append dhcp6.mpl-domain-parameters  0x80 100   18000 2 1200 4   15  3
> 1800 4   20 ff03::154;
> 
> Regards,
> 
> James