[Kea-users] DHCP4_SUBNET_SELECTION_FAILED -> DHCP4_PACKET_NAK_0001

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[Kea-users] DHCP4_SUBNET_SELECTION_FAILED -> DHCP4_PACKET_NAK_0001

Hreiðar Jóelsson

Hi, I’m struggling with getting KEA to allocate addresses when on the same local LAN as the clients. I’m using perfdhcp to test my setup with out any luck. The setup is working when the dhcp packages are coming through a relay. The config is slightly different though.

 

Here below is my config and the log generated when perfdhcp sends one package. I’ve commented out my hook code to simplify the setup.

 

## perfdhcp

perfdhcp -4 -l eth0 -e address-only -R 1 -r 1 -n 1 -x aeist

 

## kea-dhcp4 config

{

  "Dhcp4": {

    "match-client-id": false,

    "control-socket": {

      "socket-name": "/tmp/kea-dhcp4-ctrl.sock",

      "socket-type": "unix"

    },

    "decline-probation-period": 3600,

    "dhcp4o6-port": 0,

    "echo-client-id": true,

    "valid-lifetime": 600,

    "rebind-timer": 300,

    "renew-timer": 150,

    "host-reservation-identifiers": [ "hw-address"],

    "option-def": [ ],

    "expired-leases-processing": {

      "flush-reclaimed-timer-wait-time": 0,

      "hold-reclaimed-time": 0,

      "max-reclaim-leases": 0,

      "max-reclaim-time": 0,

      "reclaim-timer-wait-time": 30,

      "unwarned-reclaim-cycles": 5

    },

    "interfaces-config": {

      "interfaces": [ "ens33/83.173.0.80" ],

      "dhcp-socket-type": "raw"

    },

    "lease-database": {

      "type": "postgresql",

      "name": "kea_ag06",

      "user": "kea_admin",

      "password": "JkFdfd04.g55e8yH4f",

      "host": "postgres-cluster1",

      "port": 5432

    },

    "option-data": [

      {

        "always-send": false,

        "code": 6,

        "csv-format": true,

        "data": "83.173.0.1, 83.173.0.33",

        "name": "domain-name-servers",

        "space": "dhcp4"

      },

      {

        "always-send": false,

        "code": 15,

        "csv-format": true,

        "data": "gagnaveita.is",

        "name": "domain-name",

        "space": "dhcp4"

      },

      {

        "always-send": false,

        "code": 119,

        "csv-format": true,

        "data": "gagnaveita.is",

        "name": "domain-search",

        "space": "dhcp4"

      }

    ],

    "client-classes": [

      {

        "name": "restricted"

      },

      {

        "name": "unrestricted"

      }

    ],

    "subnet4": [ ],

    "shared-networks": [

      {

        "name": "GR-Internet-AG06",

        "option-data": [ ],

        "reservation-mode": "all",

        "interface": "ens33",

        "subnet4": [

          {

            "user-context": { "subnet-name": "GR-INTERNET-AG06-R1" },

            "4o6-interface": "",

            "4o6-interface-id": "",

            "4o6-subnet": "",

            "boot-file-name": "",

            "next-server": "0.0.0.0",

            "option-data": [

              {

                "always-send": false,

                "code": 3,

                "csv-format": true,

                "data": "10.206.0.1",

                "name": "routers",

                "space": "dhcp4"

              }

            ],

            "pools": [

              {

                "option-data": [ ],

                "pool": "10.206.0.2-10.206.255.254"

              }

            ],

            "rebind-timer": 300,

            "renew-timer": 150,

            "reservation-mode": "out-of-pool",

            "server-hostname": "",

            "subnet": "10.206.0.0/16",

            "valid-lifetime": 600

          },

          {

            "user-context": { "subnet-name": "GR-INTERNET-AG06-U1" },

            "4o6-interface": "",

            "4o6-interface-id": "",

            "4o6-subnet": "",

            "boot-file-name": "",

            "next-server": "0.0.0.0",

            "option-data": [

              {

                "always-send": false,

                "code": 3,

                "csv-format": true,

                "data": "172.16.0.1",

                "name": "routers",

                "space": "dhcp4"

              }

            ],

            "pools": [

              {

                "option-data": [ ],

                "pool": "172.16.0.2-172.16.255.254"

              }

            ],

            "rebind-timer": 300,

            "renew-timer": 150,

            "reservation-mode": "all",

            "reservations": [ ],

            "server-hostname": "",

            "subnet": "172.16.0.0/16",

            "valid-lifetime": 600

          }

        ]

      }

    ]

  },

  "Logging": {

    "loggers": [

      {

        "debuglevel": 99,

        "name": "kea-dhcp4",

        "output_options": [

          {

            "flush": true,

            "maxsize": 10485760,

            "maxver": 6,

            "output": "/usr/local/var/log/kea-dhcp4.log"

          }

        ],

        "severity": "DEBUG"

      }

    ]

  }

}

 

## kea-dhcp4.log

2019-10-04 13:03:14.266 DEBUG [kea-dhcp4.packets/1] DHCP4_BUFFER_RECEIVED received buffer from 83.173.0.81:67 to 255.255.255.255:67 over interface ens33

2019-10-04 13:03:14.267 DEBUG [kea-dhcp4.options/1] DHCP4_BUFFER_UNPACK parsing buffer received from 83.173.0.81 to 255.255.255.255 over interface ens33

2019-10-04 13:03:14.267 DEBUG [kea-dhcp4.packets/1] DHCP4_PACKET_RECEIVED [hwtype=1 00:0c:01:02:03:04], cid=[01:00:0c:01:02:03:04], tid=0x0: DHCPDISCOVER (type 1) received from 83.173.0.81 to 255.255.255.255 on interface ens33

2019-10-04 13:03:14.267 DEBUG [kea-dhcp4.packets/1] DHCP4_QUERY_DATA [hwtype=1 00:0c:01:02:03:04], cid=[01:00:0c:01:02:03:04], tid=0x0, packet details: local_address=255.255.255.255:67, remote_address=83.173.0.81:67, msg_type=DHCPDISCOVER (1), transid=0x0,

options:

  type=053, len=001: 1 (uint8)

  type=055, len=007: 1(uint8) 28(uint8) 2(uint8) 3(uint8) 15(uint8) 6(uint8) 12(uint8)

  type=061, len=007: 01:00:0c:01:02:03:04

2019-10-04 13:03:14.268 DEBUG [kea-dhcp4.packets/1] DHCP4_SUBNET_SELECTION_FAILED [hwtype=1 00:0c:01:02:03:04], cid=[01:00:0c:01:02:03:04], tid=0x0: failed to select subnet for the client

2019-10-04 13:03:14.268 DEBUG [kea-dhcp4.dhcp4/1] DHCP4_CLASS_ASSIGNED [hwtype=1 00:0c:01:02:03:04], cid=[01:00:0c:01:02:03:04], tid=0x0: client packet has been assigned to the following class(es): UNKNOWN

2019-10-04 13:03:14.268 DEBUG [kea-dhcp4.dhcp4/1] DHCP4_CLASS_ASSIGNED [hwtype=1 00:0c:01:02:03:04], cid=[01:00:0c:01:02:03:04], tid=0x0: client packet has been assigned to the following class(es): ALL, UNKNOWN

2019-10-04 13:03:14.268 DEBUG [kea-dhcp4.ddns/1] DHCP4_CLIENT_HOSTNAME_PROCESS [hwtype=1 00:0c:01:02:03:04], cid=[01:00:0c:01:02:03:04], tid=0x0: processing client's Hostname option

2019-10-04 13:03:14.268 ERROR [kea-dhcp4.bad-packets/1] DHCP4_PACKET_NAK_0001 [hwtype=1 00:0c:01:02:03:04], cid=[01:00:0c:01:02:03:04], tid=0x0: failed to select a subnet for incoming packet, src 83.173.0.81, type DHCPDISCOVER

 

 

Kær kveðja / Best Regards,
Hreiðar Jóelsson
Netsérfræðingur IP netkerfis / Network Engineer
Netfang / E-mail: [hidden email] 


Smáratorgi 3, 201 Kópavogur, Iceland
Sími / Tel: +354 516 7777 | Póstur / Email: [hidden email]

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