[Kea-users] Is Interface mandate in kea-DHCPv6 section

[Kraishak Mahtha]

Hi All,

I am trying to use kea-DHCPv6 in my local lab, and I observed that if I
don't place the line interface in subnet 6 section, it is not working and
not able to get lease even though I added the interface on global section

Configuration snippet:
{
  "Dhcp6": {
    "interfaces-config": {
      "interfaces": ["ens192"]  # The network interface the DHCPv6 server
listens on
    },

    "multi-threading": {
        "packet-queue-size": 28,
        "enable-multi-threading": true,
        "thread-pool-size": 4
    },

    "lease-database": {
      "name": "/XXXXX/XXXXXX/XXXXX/XXXX/dhcp6.leases",
       "type": "memfile",  # In-memory lease database (useful for testing)
      "persist": true     # Save leases to disk
    },


    "subnet6": [
      {
        "subnet": "2001:470:edb5:200::/64",  # The subnet from which
addresses are allocated
       # "interface": "ens192",
        "pools": [
                {"pool": "2001:470:edb5:200::2-2001:470:edb5:200::15"},
                {"pool":  "2001:470:edb5:200::3e-2001:470:edb5:200::51"},
                {"pool": "2001:470:edb5:200::52-2001:470:edb5:200::65"}
        ],

        "preferred-lifetime": 600,
        "valid-lifetime": 1200,
        "option-data": [
          {
            "name": "dns-servers",
            "data": "2001:470:edb5:200::23"  # Override DNS servers for
this subnet
          },
          {
            "name": "domain-search",
            "data": "tester.com"
          }
        ]
      }
    ]
 }
}
In the logs I am getting are as below:
2025-02-19 11:48:26.576 DEBUG [kea-dhcp6.packets/2086321.139784175461952]
DHCP6_RESPONSE_DATA responding with packet type 2 data is
localAddr=[ff02::1:2]:547 remoteAddr=[fe80::a28:a7f4:fea5:8142]:546
msgtype=2(ADVERTISE), transid=0x88e10a
type=00001, len=00014: 00:01:00:01:2c:80:f6:f7:74:5d:22:3e:02:d1
type=00002, len=00014: 00:01:00:01:2d:71:74:58:00:50:56:a2:ea:0c
type=00003(IA_NA), len=00064: iaid=125047786, t1=0, t2=0,
options:
  type=00013, len=00048: NoAddrsAvail(2) "Server could not select subnet
for this client"
type=00023, len=00016: 2001:470:edb5:200::23
type=00024, len=00012: "tester.com." (fqdn)
type=39(CLIENT_FQDN), flags: (N=1, O=0, S=0),
domain-name='ddddddd-lenovo-zzzz.' (full)
No relays traversed.


Q)
1)Is it mandatory to add the interface line in every subnet6 section,
unlike subnet4
2)If that is mandatory, how can I use multiple subnets? Let's say I have
one more network range using the same DHCPv6 appliance, but I don't have
any interface on the box. How can we use that

Can someone who is familiar with such setups and has faced similar issues
please guide me?

Thanks in Advance
Kraishak
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