[Kea-users] Bind service to loopback address

[Jason Guy]

Hi Tomek,

I have not tried UDP as I was under the impression this is only used when
the DHCP subnet was directly connected. Everything I am doing requires DHCP
RELAY. I will need to go back and see if there is a way to specify the
loopback to be a UDP socket. The other idea I had was specifying the
loopback address on every interface. Seems like a less than elegant
solution though.

Thanks,
Jason

On Wed, Apr 19, 2017 at 11:00 AM, Tomek Mrugalski <tomasz at isc.org> wrote:

> W dniu 19.04.2017 o 16:35, Jason Guy pisze:
> > I would like to leverage my routing on the host setup, and bind the kea
> > service to the loopback address I have configured. This would ultimately
> > allow me to deploy multiple kea servers with an "anycast" reachability.
> >
> > ip addr show lo
> > ...
> >     inet 10.50.5.11/32 <http://10.50.5.11/32> brd 10.50.5.11 scope
> > global lo:1
> > ...
> >
> > Kea.conf:
> > ...
> >         "interfaces-config": {
> >             "interfaces": [
> >                 "lo/10.50.5.11 <http://10.50.5.11>",
> >                 "eth0",
> >                 "eth1"
> >             ]
> >         },
> > ....
> >
> > I have tried specifying this in a few ways, and the DHCP relay packets
> > reach the server, but Kea does not appear to process them. I thought
> > about putting the loopback on the ethernet interfaces as secondary
> > addresses, but wanted to understand why I can see the relay packets
> > arrive but not picked up by Kea.
> Kea uses raw sockets by default to receive DHCPv4 traffic. Raw sockets
> receive raw packets, i.e. everything that comes over wire (ethernet
> header, ip, udp and everything that follows). This is different on
> loopback as there's no notion of ethernet headers there. Kea has some
> support for loopback traffic handling, but it's not used extensively, so
> did not receive much testing.
>
> Have you tried setting dhcp-socket-type to udp? If that doesn't help at
> all, can you open a ticket for this?
>
> Tomek
>
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