[Kea-users] Doubled and tripled domain

Zayer, Sebastian Sebastian.Zayer at takko.de
Mon Mar 19 15:30:32 UTC 2018 

Hey there,

we are experiencing some issues on some of our devices regarding the domainpart. It's doubled or tripled (like device.example.org.example.org or device.example.org.example.org.example.org) which is not just annoying but also relevant to the dns.
The main part of the network is Microsoft-based (AD, AD-DNS, Authentication, ...).

Can anybody tell me, where the problem is?

The interesting part of the configuration looks like the following:

--kea-dhcp4.conf start--
"Dhcp4": {

    "dhcp-ddns": {
      "enabled-updates": true,
      "qualifying-suffix": , "example.com."
      "replace-client-name": "never",
      "generated-prefix": "noname"
    },

    "option-data": [
    {
      "code": 15,
      "name": "domain-name",
      "data": "example.com"
    },
    {
      "name": "domain-search",
      "data": "example.com"
    }
    ]
...
--kea-dhcp4.conf end-

In the logs we see the following (1 example, DEBUG 99):

DEBUG [kea-dhcp4.packets] DHCP4_PACKET_RECEIVED [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: DHCPDISCOVER (type 1) received from 10.36.9.97 to 192.168.100.114 on interface ens192

DEBUG [kea-dhcp4.packets] DHCP4_QUERY_DATA [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003, packet details: local_address=192.168.100.114:67, remote_address=10.36.9.97:67, msg_type=DHCPDISCOVER (1), transid=0xf2110003,#012options:#012 type=012, len=010: "printerdevice" (string)#012  type=050, len=004: 10.36.9.104 (ipv4-address)#012  type=051, len=004: 4294967295 (uint32)#012  type=053, len=001: 1 (uint8)#012  type=055, len=014: 1(uint8) 3(uint8) 42(uint8) 4(uint8) 6(uint8) 12(uint8) 15(uint8) 26(uint8) 44(uint8) 51(uint8) 54(uint8) 58(uint8) 59(uint8) 190(uint8)#012  type=060, len=058: "Mfg=LEXMARK;Typ=MFP;Mod=Lexmark MX310dn;Ser=<serialnr>;" (string)#012  type=061, len=007: 01:00:21:b7:f3:d8:20

DEBUG [kea-dhcp4.packets] DHCP4_SUBNET_SELECTED [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: the subnet with ID 4376 was selected for client assignments

DEBUG [kea-dhcp4.packets] DHCP4_SUBNET_DATA [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: the selected subnet details: 10.36.9.96/27

DEBUG [kea-dhcp4.dhcp4] DHCP4_CLASS_ASSIGNED [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: client packet has been assigned to the following class(es): VENDOR_CLASS_Mfg=LEXMARK;Typ=MFP;Mod=Lexmark MX310dn;Ser=<serialnr>;

DEBUG [kea-dhcp4.ddns] DHCP4_CLIENT_HOSTNAME_PROCESS [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: processing client's Hostname option

DEBUG [kea-dhcp4.ddns] DHCP4_CLIENT_HOSTNAME_DATA [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: client sent Hostname option: printerdevice

DEBUG [kea-dhcp4.ddns] DHCP4_CLIENT_HOSTNAME_DATA [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: client sent Hostname option: printerdevice

DEBUG [kea-dhcp4.ddns] DHCP4_RESPONSE_HOSTNAME_DATA [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: including Hostname option in the server's response: printerdevice.example.org

DEBUG [kea-dhcp4.alloc-engine] ALLOC_ENGINE_V4_OFFER_EXISTING_LEASE allocation engine will try to offer existing lease to the client [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003

INFO  [kea-dhcp4.leases] DHCP4_LEASE_ADVERT [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: lease 10.36.9.104 will be advertised

DEBUG [kea-dhcp4.options] DHCP4_PACKET_PACK [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: preparing on-wire format of the packet to be sent

DEBUG [kea-dhcp4.packets] DHCP4_PACKET_SEND [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: trying to send packet DHCPOFFER (type 2) from 192.168.100.114:67 to 10.36.9.97:67 on interface ens192

DEBUG [kea-dhcp4.packets] DHCP4_RESPONSE_DATA [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: responding with packet DHCPOFFER (type 2), packet details: local_address=192.168.100.114:67, remote_address=10.36.9.97:67, msg_type=DHCPOFFER (2), transid=0xf2110003,#012options:#012  type=001, len=004: 4294967264 (uint32)#012  type=003, len=004: 10.36.9.97#012  type=006, len=008: 192.168.100.15 192.168.100.14#012  type=012, len=020: "printerdevice.example.com" (string)#012  type=042, len=008: 192.168.100.15 192.168.100.14#012  type=044, len=004: 192.168.100.15#012  type=051, len=004: 1209600 (uint32)#012  type=053, len=001: 2 (uint8)#012  type=054, len=004: 192.168.100.114#012  type=058, len=004: 604800 (uint32)#012  type=059, len=004: 604800 (uint32)#012  type=061, len=007: 01:00:21:b7:f3:d8:20

DEBUG [kea-dhcp4.packets] DHCP4_PACKET_RECEIVED [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: DHCPREQUEST (type 3) received from 10.36.9.97 to 192.168.100.114 on interface ens192

DEBUG [kea-dhcp4.packets] DHCP4_QUERY_DATA [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003, packet details: local_address=192.168.100.114:67, remote_address=10.36.9.97:67, msg_type=DHCPREQUEST (3), transid=0xf2110003,#012options:#012  type=012, len=020: "printerdevice.example.com" (string)#012  type=050, len=004: 10.36.9.104 (ipv4-address)#012  type=053, len=001: 3 (uint8)#012  type=054, len=004: 192.168.100.114 (ipv4-address)#012  type=055, len=014: 1(uint8) 3(uint8) 42(uint8) 4(uint8) 6(uint8) 12(uint8) 15(uint8) 26(uint8) 44(uint8) 51(uint8) 54(uint8) 58(uint8) 59(uint8) 190(uint8)#012  type=060, len=058: "Mfg=LEXMARK;Typ=MFP;Mod=Lexmark MX310dn;Ser=<serialnr>;" (string)#012  type=061, len=007: 01:00:21:b7:f3:d8:20#012  type=81 (CLIENT_FQDN), flags: (N=0, E=0, O=0, S=0), domain-name='printerdevice.example.com.example.com' (partial)

DEBUG [kea-dhcp4.packets] DHCP4_SUBNET_SELECTED [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: the subnet with ID 4376 was selected for client assignments

DEBUG [kea-dhcp4.packets] DHCP4_SUBNET_DATA [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: the selected subnet details: 10.36.9.96/27

DEBUG [kea-dhcp4.dhcp4] DHCP4_CLASS_ASSIGNED [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: client packet has been assigned to the following class(es): VENDOR_CLASS_Mfg=LEXMARK;Typ=MFP;Mod=Lexmark MX310dn;Ser=<serialnr>;

DEBUG [kea-dhcp4.ddns] DHCP4_CLIENT_FQDN_PROCESS [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: processing Client FQDN option

DEBUG [kea-dhcp4.ddns] DHCP4_CLIENT_FQDN_DATA [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: Client sent FQDN option: type=81 (CLIENT_FQDN), flags: (N=0, E=0, O=0, S=0), domain-name='printerdevice.example.com.example.com' (partial)

DEBUG [kea-dhcp4.ddns] DHCP4_RESPONSE_FQDN_DATA [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: including FQDN option in the server's response: type=81 (CLIENT_FQDN), flags: (N=0, E=0, O=0, S=0), domain-name='printerdevice.example.com.example.com.example.com.' (full)

DEBUG [kea-dhcp4.alloc-engine] ALLOC_ENGINE_V4_REQUEST_EXTEND_LEASE [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: extending lifetime of the lease for address 10.36.9.104

INFO  [kea-dhcp4.leases] DHCP4_LEASE_ALLOC [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: lease 10.36.9.104 has been allocated

DEBUG [kea-dhcp4.ddns] DHCP4_NCR_CREATE [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: DDNS updates enabled, therefore sending name change requests

DEBUG [kea-dhcp4.options] DHCP4_PACKET_PACK [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: preparing on-wire format of the packet to be sent

DEBUG [kea-dhcp4.packets] DHCP4_PACKET_SEND [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: trying to send packet DHCPACK (type 5) from 192.168.100.114:67 to 10.36.9.97:67 on interface ens192

DEBUG [kea-dhcp4.packets] DHCP4_RESPONSE_DATA [hwtype=1 00:21:b7:f3:d8:20], cid=[01:00:21:b7:f3:d8:20], tid=0xf2110003: responding with packet DHCPACK (type 5), packet details: local_address=192.168.100.114:67, remote_address=10.36.9.97:67, msg_type=DHCPACK (5), transid=0xf2110003,#012options:#012  type=001, len=004: 4294967264 (uint32)#012  type=003, len=004: 10.36.9.97#012  type=006, len=008: 192.168.100.15 192.168.100.14#012  type=042, len=008: 192.168.100.15 192.168.100.14#012  type=044, len=004: 192.168.100.15#012  type=051, len=004: 1209600 (uint32)#012  type=053, len=001: 5 (uint8)#012  type=054, len=004: 192.168.100.114#012  type=058, len=004: 604800 (uint32)#012  type=059, len=004: 604800 (uint32)#012  type=061, len=007: 01:00:21:b7:f3:d8:20#012  type=81 (CLIENT_FQDN), flags: (N=0, E=0, O=0, S=0), domain-name='printerdevice.example.com.example.com.example.com.' (full)
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