[Dnsmasq-discuss] Cannot assign IPv6 address for /96 subnet

[Simon Kelley]

On 07/03/13 22:38, Sheng Yang wrote:
> Hi Simon,
>
> Any chance you can reproduce it?
>
> If dhcp-range can accept a prefix rather than 64 then hand it out, I
> think dhcp-host should also able to do so...

I just tested 2.66test21, and it worked fine for me. I didn't test 
earlier code.

I've re-written huge chunks of relevant code for test21, without 
actually looking at this problem. So either I've not got the same 
conditions as you and the bug is still there, or I've done a better job 
this time round as fixed the bug without doing so explicitly.


Please could you give 2.66test21 a go with you config, and see how you 
get on?



Cheers,

Simon.

>
> --Sheng
>
> On Wed, Feb 20, 2013 at 2:58 AM, Simon Kelley<simon at thekelleys.org.uk>  wrote:
>> On 20/02/13 02:16, Sheng Yang wrote:
>>> Hi Simon,
>>>
>>> Did you use dhcphost option? dhcp-range works for me(if I specify a
>>> range), but not with dhcp-host option(when I specify dhcp-range as
>>> static).
>>
>> Ah, no, I didn't. I should have read back through the thread. I'll check
>> again, but it rather looks like this is non possible, by design,  (or
>> miss-design)
>>
>> Simon.
>>
>>>
>>> --Sheng
>>>
>>> On Tue, Feb 19, 2013 at 1:06 PM, Simon Kelley<simon at thekelleys.org.uk>  wrote:
>>>> So, I did some testing. I configured an server interface with prefix-length
>>>> 96, and configured dnsmasq with a dhcp-range and 96 prefix.
>>>>
>>>> Using dhclient, I got a lease successfully.
>>>>
>>>> The only problem is that dhclient configured the client's interface with
>>>> prefix-length 64.
>>>>
>>>> I moment's thought shows that this is expected: there is nowhere in the
>>>> DHCPv6 messages for the prefix-length information to be passed to the
>>>> client. There _is_ a prefix-length field in router-advertisements. but
>>>> AFAIK, there's no way for the DHCPv6 client to use that information.
>>>>
>>>> Of course if you're using RA for address-allocation, using SLAAC, the prefix
>>>> length has to be 64 anyway.
>>>>
>>>> If anyone knows better, or can explain how the standard(s) are supposed to
>>>> work, please enlighten me.
>>>>
>>>> Simon.
>>>
>>
>