[Kea-users] i do not understand the concept of shared networks

[Giso Kegel]

Hi Bob,

thanks yes that makes sense.
That means my 50+ networks are NOT shared networks because thy are all 
in a different Vlan behind a relay host?
So i could live with simply subnet4 definitions without shared networks?

What worked until now in my test environment is one shared network with 
all my 50 reservation subnet in it and one dyn pool.
That one Shared network has the relay option set so that everything need 
to come from that relay host.
Similar to that example from Satish without the relay host. @Satish 
Thanks for you response

###
...
   "shared-networks": [

       {
         "name": "device-mgmt",
         "relay": {
                 "ip-addresses": [ "10.3.1.3" ]
          },
         "subnet4": [
           {
             "id": 2,
...
###

I now understand it that way that this configuration is wrong because 
these networks are on separate VLAN and have nothing todo with each other.
There is no network expand an existing one.

Where is my misunderstanding?

---

Giso


Am 10.03.20 um 22:00 schrieb Bob Harold:
>
> On Tue, Mar 10, 2020 at 9:15 AM Giso Kegel <giso.kegel at cloud.ionos.com 
> <mailto:giso.kegel at cloud.ionos.com>> wrote:
>
>     Hi Folks,
>
>     I work with kea 1.6.1
>
>     I really do not understand the concept or at leased the documentation
>     regarding shared-networks.
>     Do i need shared-networks or not?
>     I do not have the problem that I have networks that grew out of there
>     original definition.
>
>     https://kea.readthedocs.io/en/latest/arm/dhcp4-srv.html
>
>     lets say i have 50+ subnet4 that will ask the kea dhcp server over
>     dhcp
>     relayhosts (a swtich).
>
>     All these subnet4 will hold only server that have a IP-reservation.
>
>     Do i need multi shard networks?
>     Can or do i have to put these 50+ networks in multi shared networks?
>     Do i have to use different interfaces  for each shared network?
>
>     I would be very thankful for some enlightenment.
>
>     Best
>     Giso
>
>
> "Shared networks" are layer 3 subnets in the same layer 2 broadcast 
> domain (physical wire or VLAN).  If the same router port has multiple 
> subnets on it, and they are not 'tagged' differently, then they are 
> "shared networks". Otherwise, they are not shared.
> Does that help?
>
> -- 
> Bob Harold

-- 
Giso Kegel

Systems Engineer
Internal Support & Services (IONOS Cloud)

1&1 IONOS SE | Greifswalder Str. 207 | 10405 Berlin | Germany
Phone:
E-Mail: giso.kegel at cloud.ionos.com | Web: www.ionos.de

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