dhclient on Debian Jessie not sending the same identifier for DHCPv4 and DHCPv6 (RFC 4361)

[Shawn Routhier]

Try the -df option to the client.  

This provides a method to share a DUID between the two clients.

> On Sep 8, 2015, at 7:55 AM, Nicolas C. <dhcp at nryc.fr> wrote:
> 
> Hello,
> 
> I'm currently testing RFC 4361 (CHCPv4 + DHCPv6 + DDNS), with :
> 
> - a dual-stack DNS server,
> - an IPv4-only DHCPv4 server,
> - an IPv6-only DHCPv6 server,
> - a dual-stack client.
> 
> All of those are Debian Jessie 64-bits machines. DHCP servers are configured with "ddns-update-style standard".
> 
> The client is configured with :
> 
> /etc/network/interfaces
> 
> auto eth0
> iface eth0 inet dhcp
> iface eth0 inet6 dhcp
> 
> And "send fqdn.fqdn = gethostname();" in /etc/dhcp/dhclient.conf (instead of "send host-name").
> 
> The client receives its IPv4/v6 addresses correctly but its not submitting the same identifier to the DHCP resulting a conflict during DDNS.
> 
> I tried using the "-I -D LLT" parameters with dhclient which is supposed to make the DHCPv4 client use the same DUID as the DHCPv6 client :
> 
> https://deepthought.isc.org/article/AA-01091/0/ISC-DHCP-support-for-Standard-DDNS.html
> 
> But it doesn't work, the DHCID in the DNS is not the same.
> 
> This is the result in the forward zone (rfc4361.test) when I use "dhclient -4 -I -D LLT eth0" :
> 
> dual-test.rfc4361.test. 300     IN      DHCID AAIBNrUJyL3Zib55vs1WVGxqeX3JQ2VR69qlOISd77gOLXk=
> dual-test.rfc4361.test. 300     IN      A       172.20.56.100
> 
> This is the result in the forward zone when I use "dhclient -6 -I -D LLT eth0" :
> 
> dual-test.rfc4361.test. 187     IN      DHCID AAIBEiFR4yAyM0FCusKxbBQvAPuAoRu2xiUDSnqLeu/9IY4=
> dual-test.rfc4361.test. 187     IN      AAAA    2001:660:3305:122::f5c
> 
> Thanks for your help,
> 
> Nicolas C.
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