[Kea-users] Kea 4 docsis

[Tomek Mrugalski]

On 20.11.2015 13:32, Михаил Ермаков wrote:
> This guide (
> http://kea.isc.org/docs/kea-guide.html#dhcp-install-configur) contains
> information about 66 and 67 options, but nothing about 122. But you can
> use custom DHCP options.
> 
> Please note I'm just a user like you.
What Michail had said is true. While option 122 is not supported out of
the box, you can define it as a custom option, define that it conveys a
option namespace and then define suboptions within that namespace.

This is a capability that we never received much feedback on. I'm eager
to hear from you whether the capability we have now is sufficient. If
it's not, what exactly is missing.

As you may know, we're preparing for upcoming 1.0 release (expected
before end of 2015) and our development plans are quite tight. We can't
make any promises, but

> Does kea support tftp server option(66) and bootfile name option(67)?

I recall that couple years ago we did implement one hack for cable
modems. IIRC the hack was to put content of the bootfile name option was
specified, its content was also send in the file field of the packet.
Kea does that only for docsis3.0 devices. This was requested by cable
modem operator.

Regarding docsis, you should read Section 7.5.2
(http://kea.isc.org/docs/kea-guide.html#dhcp4-srv-example-client-class-relay).
It explains how to segregate CMs and CPEe into different subnets. This
capability is limited, but we managed to provision a small cable network
with it. More flexible client classification is planned for 1.0 and 1.1.

Finally, I'm very interested to hear from you which options (and
suboptions) you are using and how. Do they have specified values for all
devices that ask? Or do you make distinctions between certain clients
and provide values specific to a given modem? If that is so, I'm very
interested in how you'd like to differentiate between different models.
This is essential for making our client classification usable in cable
networks.

Hope that helps,
Tomek