Option dhcp6.client-linklayer-addr

[Antonios Atlasis]

Hi,

I agree with all your observations, they are correct.

I am using a Cisco one. It adds it out of the box when configured as a
Relay, no other configuration is required.

Btw, is anyone of the group aware of any other DHCPv6 server that may
support RFC 6939?

Best

Antonios

On 3 February 2015 at 22:41, perl-list <perl-list at network1.net> wrote:

> Wireshark shows option 79 clearly present in the packet.  Looks like the
> mac address of the device is e4:11:5b:29:e4:35
>
> It does indeed look like RFC 6939 OPTION_CLIENT_LINKLAYER_ADDR (79) should
> be in 4.3.1 per
> https://deepthought.isc.org/article/AA-01112/0/Newly-Pre-defined-Options-in-DHCP-4.3.html
>
> dhcp6.client-linklayer-addr *string*
>  A client link-layer address.  The first two bytes must be the type of
> the link-layer followed by the address itself.
>  This option is included based on RFC 6939.
>
> Hope this gets resolved as we will need to use that option in the future.
>
> Out of curiosity, Antonios, what relay agent are you using that is adding
> that option to the packet?
>
>
> ------------------------------
>
> *From: *"Antonios Atlasis" <antonios.atlasis at gmail.com>
> *To: *"Users of ISC DHCP" <dhcp-users at lists.isc.org>
> *Sent: *Tuesday, February 3, 2015 2:48:35 PM
> *Subject: *Re: Option dhcp6.client-linklayer-addr
>
> Thank you very much Espen for your response.
>
> Well,. the client linklayer address option is not encapsulated in the
> dhcpb6 request, but directly into the dhcpb6 relay message, because, as the
> RFC 6939 specifies, it is added by the Relay server and not by the client
> itself. I am attaching a pcap if someone wants to have a look at it.
>
> Nevertheless, I will give it a try tomorrow at the lab and I'll let you
> know.
>
> Thanks again
>
> Antonios
>
> On 3 February 2015 at 20:45, Espen Tallaksen <espen.tallaksen at gmail.com>
> wrote:
>
>> Hi
>>
>> At least you will need to extract the dhcp-request from the relayed
>> dhcp-packet as it's kind of encapsulated by the relay-agent. You will find
>> an example below:
>>
>> v6relay(1, (binary-to-ascii(16, 8, ":", option docsis.cm-mac-address)));
>>
>> v6relay(1, something) 1 refers to the first relay-agent in the chain.
>>
>> Obviously, you will neew to replace docsis-things with your stuff. I have
>> never tried dhcp6.client-linklayer-addr though. Hope it will help you out.
>>
>>
>> Best regards
>>
>> Espen Tallaksen
>>
>>
>> On 3 Feb 2015 18:21, "Antonios Atlasis" <antonios.atlasis at gmail.com>
>> wrote:
>>
>>> Hi,
>>>
>>> I have setup a DHCPv6 relay which forwards the DHCPv6 request to my ISC
>>> DHCPv6 server version 4.3.1 running on Centos 6.6.
>>>
>>> The DHCPv6 server leases an address successfully to the client.
>>>
>>> I have confirmed by using wireshark  that the DHCPv6 Relay includes the
>>> Option 79 (Client Link-Layer Address) defined in RFC6939 in its
>>> Relay-Forward messages.
>>>
>>> I want to log the MAC address of the client by using the
>>> dhcp6.client-linklayer-addr which seems to be implemented in this version
>>> of ISC DHCP (I am saying "it seems" because it is included here:
>>> https://deepthought.isc.org/article/AA-01112/0/Newly-Pre-defined-Options-in-DHCP-4.3.html
>>> but not in the official documentation).
>>>
>>> In my dhcpd.conf I have tried several configurations, including the one
>>> described here:
>>> https://www.mail-archive.com/dhcp-users@lists.isc.org/msg00622.html
>>> that is:
>>>
>>> if (exists dhcp6.client-linklayer-addr) {
>>>         log(info,"option dhcp6.client-linklayer-addr present");
>>> } else {
>>>        log(info,"option dhcp6.client-linklayer-addr not present");
>>> }
>>>
>>> but I also get
>>>
>>> dhcpd: option dhcp6.client-linklayer-addr not present
>>>
>>> Does anyone know if this option is implemented indeed and if so, what I
>>> am possibly missing? Any suggestions?
>>>
>>> Thanks
>>>
>>> Antonios
>>>
>>> _______________________________________________
>>> dhcp-users mailing list
>>> dhcp-users at lists.isc.org
>>> https://lists.isc.org/mailman/listinfo/dhcp-users
>>>
>>
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