[Kea-users] single subnet for multiple interfaces

[Darren Ankney]

Hi Joe,

In that case, shouldn't all of the DHCP traffic be present on the
loopback?  Therefore, telling Kea to only listen on the loopback
containing this gateway would be most appropriate?  Otherwise, you
might have to do some class magic to assign clients to the subnet
regardless of their interface.  You can only specify one interface per
subnet in Kea.  I've honestly never tried this in Kea.

Thank you,

Darren Ankney

On Thu, Jul 13, 2023 at 11:33 AM Joe Botha <joe at swimgeek.com> wrote:
>
> Hi
>
> We look at using relays, but ISC DHCP relay is end-of-life, and it can’t add v6 PD routes - so we are looking at just installing Kea on the switch - which is why we want an IP pool shared with multiple VLAN interfaces.
>
> > Does the subnet need to receive different networking/routing details
> > depending on which VLAN it is attached to?
>
> Nope, all the same gateway IP - which we will probably put on a loopback interface.
>
> --
> Swimmingly,
>  Joe
>
> swimgeek.com/blog  +27 82 562 6167  instagram.com/joe.swimgeek
>       "...all progress depends on the unreasonable man.”
>
>
>
>
> > On 13 Jul 2023, at 17:22, Darren Ankney <darren.ankney at gmail.com> wrote:
> >
> > Hi Joe,
> >
> > Does the subnet need to receive different networking/routing details
> > depending on which VLAN it is attached to?
> >
> > Is the DHCP traffic relayed?
> >
> > You might be able to something like:
> >
> > "subnet4": [
> >  {
> >    "id": 1,
> >     "subnet": "192.0.2.0/24",
> >     "relay": {
> >        "ip-addresses": [ "198.51.100.1", "198.51.100.2" ]
> >     }
> >  }
> > ]
> >
> > where you are specifying multiple relay ips to use for assigning from
> > one subnet.  Take care here as the clients will all receive the same
> > details (subnet mask, default gw etc..) so it must be confirmed that
> > this is ok from a routing prospective.
> >
> > Thank you,
> >
> > Darren Ankney
> >
> > On Thu, Jul 13, 2023 at 11:07 AM Joe Botha <joe at swimgeek.com> wrote:
> >>
> >> Hi
> >>
> >> Is there a way to configure Kea so you can share a subnet over multiple interfaces?
> >>
> >> Use case is something like sharing a /24 subnet where you have a few VLAN interfaces on the server.
> >>
> >> --
> >> Swimmingly,
> >> Joe
> >>
> >> swimgeek.com/blog  +27 82 562 6167  instagram.com/joe.swimgeek
> >>      "...all progress depends on the unreasonable man.”
> >>
> >>
> >>
> >> --
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