Re: [homenet] Comments requested for draft CER-ID

[Mikael Abrahamsson <[e-mail]>]

On Mon, 27 Oct 2014, Michael Kloberdans wrote:

> 2.  CER Identification Option
>
>   A Customer Edge Router (CER) sets the CER_ID to the IPv6 address of
>   its LAN interface.  If it has more than one LAN IPv6 address, it
>   selects one of its LAN or loopback IPv6 addresses to be used in the
>   CER_ID.  An ISP server does not respond with the CER_ID or sets the
>   CER_ID to ::.  Such a response or lack of response indicates to the
>   DHCPv6 client that it is the CER.
>
>   The format of the CER Identification option is:
>
>    0                   1                   2                   3
>    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>   |      option-code              |      option-len               |
>   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>   |                                                               |
>   |                           CER_ID                              |
>   |                                                               |
>   |                                                               |
>   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>       option-code          OPTION_CER_ID (TBD).
>       option-len           36
>       CER_ID value         IPv6 address of CER or ::

I am not an expert when it comes to DHCP. Is there something implicit in 
the way that DHCP options are designed that makes it obvious that the 
"CER_ID value" is using ASCII or 128 bits binary to represent the IPv6 
address? Because it's not obvious to me from reading the above text.

-- 
Mikael Abrahamsson    email: [e-mail]