Option dhcp6.client-linklayer-addr

Espen Tallaksen espen.tallaksen at gmail.com
Tue Feb 3 18:45:07 UTC 2015


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
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> dhcp-users at lists.isc.org
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