[Dnsmasq-discuss] Dnsmasq - dnsmasq.leases IPv6 example

[Sivabalakrishnan M]

The real mac address is - 00:50:56:96:42:c2. The prefix in question is
00:01:00:01:1e:97:03:eb:
(8 bytes).

Thanks,
Siva

On Tue, Apr 5, 2016 at 10:57 PM, Sivabalakrishnan M <
sivabalakrishnan.m at gmail.com> wrote:

> Thanks much Albert for the reply. Sorry, I meant 6 bytes for MAC and it
> was a typo. Please find more details below.
>
> We use --dhcp-script & --leasefile-ro options for maintaining lease
> database instead of the default dnsmasq leases file. The issue that am
> facing is -  the script is invoked by Dnsmasq daemon with mac address of
> size of more than 6 bytes as you can see below. Our script validates the
> mac address and since it exceeds the 6 byte, we return error.
>
> Dnsmasq logs:
> Apr  1 21:59:34 dnsmasq-dhcp[620]: DHCPSOLICIT(5)
> 00:01:00:01:1e:97:03:eb:00:50:56:96:42:c2
> Apr  1 21:59:34 dnsmasq-dhcp[620]: DHCPADVERTISE(5) 20:1::1:1b7
> 00:01:00:01:1e:97:03:eb:00:50:56:96:42:c2
> Apr  1 21:59:35 dnsmasq-dhcp[620]: DHCPREQUEST(5)
> 00:01:00:01:1e:97:03:eb:00:50:56:96:42:c2
> Apr  1 21:59:35 dnsmasq-dhcp[620]: DHCPREPLY(5) 20:1::1:1b7
> 00:01:00:01:1e:97:03:eb:00:50:56:96:42:c2
>
> The mac address passed to script by Dnsmasq is also
> 00:01:00:01:1e:97:03:eb:00:50:56:96:42:c2 for IPv6 address 20:1::1:1b7. The
> actual mac address is :50:56:96:42:c2. But I don't know how
> 00:01:00:01:1e:97:03:eb:00: gets prefixed to the real mac address. This is
> the problem am facing now. Please let me know if this is expected in any
> scenario or if not, what could be the issue here? Any help on this is
> really appreciated.
>
> Thanks,
> Siva
>
> On Tue, Apr 5, 2016 at 10:40 PM, Albert ARIBAUD <albert.aribaud at free.fr>
> wrote:
>
>> Hi,
>>
>> Le Tue, 5 Apr 2016 18:48:37 -0700
>> Sivabalakrishnan M <sivabalakrishnan.m at gmail.com> a écrit:
>>
>> > Hi,
>> >
>> > Could anyone please share the sample output of dnsmasq.leases file
>> > for IPv6 entries? Is it possible to have mac address with size more
>> > than 8 bytes for IPv6? Please let me know.
>>
>> MAC addresses are standard, have 6 bytes, not 8, and do not differ in
>> IPv6 from what they are in IPv6.
>>
>> Are you maybe referring to the EUI-64 format address in SLAAC ? But that
>> too is fixed-format, so you cannot have an EIU-64 address longer (or
>> shorter, for that matter) than 8 bytes.
>>
>> Can you expand on what the actual problem is that you are encountering?
>>
>> > Thanks,
>> > Siva
>>
>> Amicalement,
>> --
>> Albert.
>>
>
>
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