Fwd: issues with ipv6 and DUID

Steven Carr sjcarr at gmail.com
Fri Apr 5 08:30:11 UTC 2013


http://linuxreviews.org/man/dhclient/
*-D** LL or LLT* Override the default when selecting the type of DUID to
use. By default, DHCPv6 *dhclient* creates an identifier based on the
link-layer address (DUID-LL) if it is running in stateless mode (with *-S*,
not requesting an address), or it creates an identifier based on the
link-layer address plus a timestamp (DUID-LLT) if it is running in stateful
mode (without *-S*, requesting an address). *-D* overrides this default,
with a value of either *LL* or *LLT*.



On 4 April 2013 23:52, Cory Coager <ccoager at gmail.com> wrote:

>  So the packet capture was a great help.  Looks like the client is using
> DUID-LLT which always changes.  How do I tell the client to use DUID-LL
> instead?
>
>
> On 04/04/2013 06:35 PM, Cory Coager wrote:
>
> Client OS is Ubuntu 12.04, client version 4.1.ESV-R4-0ubuntu5.6.  It seems
> to support ipv6 as I can get an ipv6 address from the server and basic
> networking seems to function.
>
> Here is the server logs for a release and renew:
> Apr  4 22:26:48 server dhcpd: Release message from fe80::5054:ff:feea:db36
> port 546, transaction ID 0x88BFCA00
> Apr  4 22:26:48 server dhcpd: Client
> 00:01:00:01:18:e8:e9:79:52:54:00:ea:db:36 releases address
> fde8:cceb:ccfe:b5b4:238a:691f:17d3:24ae, which is not leased to it.
> Apr  4 22:26:48 server dhcpd: Sending Reply to fe80::5054:ff:feea:db36
> port 546
> Apr  4 22:26:49 server dhcpd: Solicit message from fe80::5054:ff:feea:db36
> port 546, transaction ID 0x9E590C00
> Apr  4 22:26:49 server dhcpd: Sending Advertise to fe80::5054:ff:feea:db36
> port 546
> Apr  4 22:26:50 server dhcpd: Request message from fe80::5054:ff:feea:db36
> port 546, transaction ID 0x6366E00
> Apr  4 22:26:50 server dhcpd: Sending Reply to fe80::5054:ff:feea:db36
> port 546
>
> I haven't tried a packet capture yet.
>
> I just tried with a /64 subnet, didn't make a difference.
>
> fde8:cceb:ccfe:b5b4:238a:691f:17d3:2440 is the DHCP server which is also
> serving DNS.  There is no router involved in this subnet, all on the same
> vlan.
>
> On 04/04/2013 05:23 PM, Steven Carr wrote:
>
>  What client are you using? Does this client fully support DHCPv6? You've
> indicated what the client log shows but what does the server logs show?
> What messages can you see in a packet capture?
>
>  There was also some discussion a while back (possibly not on this list)
> but about potential issues with non /64 subnet sizes, in that the OS stack
> may not support anything other than a /64 given that for native SLAAC to
> work it requires /64.
>
>  Steve
>
>
>
> On 2 April 2013 23:10, Cory Coager <ccoager at gmail.com> wrote:
>
>> On 04/01/2013 09:15 PM, Cory Coager wrote:
>>
>>> On 04/01/2013 10:03 AM, Simon Hobson wrote:
>>>
>>>> AFAIK, the only reliable way of getting it is to wait for the client to
>>>> boot, and get the DUID from the lease created (or the logfile ?). On a busy
>>>> network, I'm not sure how you'd identify that specific client.
>>>>
>>> Did you see the log I posted?  I'm already do this and it doesn't seem
>>> to work.
>>>
>>
>>  I just tried this again.  The DUID from the DHCP logs matches up with
>> what I have in the config file for a fixed address.  However, it is
>> assigning the client a random IP still.
>>
>> Has anyone gotten this to work?  Is this a bug perhaps?
>>
>> I'm using version 4.1.ESV-R4-0ubuntu5.6 on Ubuntu 12.04.
>>
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>> dhcp-users at lists.isc.org
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>>
>
>
>
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