[Kea-users] Unable To Support Multiple Subnets via DHCP Relay

[Andrea Gabellini]

Hello,

same problem here. Any hint or workaround?

Andrea

> I'm trying to configure Kea 1.1.0 to service DHCP leases for a BRAS/BNG
> router (Juniper MX). The BNG relays from its loopback IP address, and might
> have several different subscriber subnets. This is kind of like sections
> 7.5.1 and 7.5.2 in the User Guide -- except I have multiple subnets all in
> the same class. This worked fine in ISC-DHCPD, but I can't get the
> equivalent configuration working in Kea. Is this unsupported at this time,
> or is there something I've overlooked?
>
>
> i.e.:
>
> "Dhcp4":
> {
>  ...
>   "subnet4": [
>   {    "subnet": "192.168.97.72/29",
>        "id": 72,
>        "option-data": [ { "name": "routers", "data": "192.168.97.75" } ],
>        "relay": { "ip-address": "172.16.100.1" },
>        "pools": [ { "pool": "192.168.97.75/32" } ] },
>   {    "subnet": "192.168.97.88/29",
>        "id": 88,
>        "option-data": [ { "name": "routers", "data": "192.168.97.89" } ],
>        "relay": { "ip-address": "172.16.100.1" },
>        "pools": [ { "pool": "192.168.97.92/32" } ] },
>   ]
> },
>
> With the above config, the first DHCP client gets the 192.168.97.75 IP
> address. The second DHCP client gets no address, because subnet id 72
> (192.168.9772/29)" is out of leases. The Kea server never even attempts to
> allocate from the 192.168.97.88/29 subnet.
>
> With ISC DHCPD, this shared network syntax accomplishes the desired results:
>
> shared-network bngtest {
>         # BNG's loopback lo0.x /32 relay IP
>         subnet 172.16.100.1 netmask 255.255.255.255 {
>         }
>         subnet 192.168.97.72 netmask 255.255.255.248 {
>         }
>         pool {
>                 # this is the default pool for dynamic customers
>                 deny dynamic bootp clients; # DHCP is OK, BOOTP is not...
>                 range 192.168.97.75 192.168.97.75;
>                 option routers 192.168.97.73;
>         }
>         subnet 192.168.97.88 netmask 255.255.255.248 {
>         }
>         pool {
>                 # this is an overlay pool for dynamic customers
>                 deny dynamic bootp clients;
>                 range 192.168.97.92 192.168.97.92;
>                 option routers 192.168.97.89;
>         }
> }
>
>
>
> Thanks!
> -Adam

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Ing. Andrea Gabellini
Email: andrea.gabellini at telecomitalia.sm
Skype: andreagabellini
Tel: (+378) 0549 886111
Fax: (+378) 0549 886188

Telecom Italia San Marino S.p.A.
Via XXVIII Luglio, 212 - Piano -2
47893 Borgo Maggiore
Republic of San Marino

http://www.telecomitalia.sm

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