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

[Sivabalakrishnan M]

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.
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/attachments/20160405/1a552a2d/attachment.html>