[Kea-users] Unable to get offers from kea- DHCP appliance

Thu Jul 20 18:17:34 UTC 2023

Hi Kraishak,

I found an example transaction (0x67937012) showing a failure (logs
below).  It looks like it couldn't find a free address in the subnet.
Is your subnet full?

2023-07-20 12:53:20.793 DEBUG [kea-dhcp4.packets/7850.140433344689920]
DHCP4_PACKET_RECEIVED [hwtype=1 11:3f:ff:00:00:05],
cid=[01:11:3f:ff:00:00:05], tid=0x67937012: DHCPDISCOVER (type 1)
received from 4.0.0.1 to 192.168.0.125 on interface eth0

2023-07-20 12:53:20.793 DEBUG [kea-dhcp4.packets/7850.140433344689920]
DHCP4_QUERY_DATA [hwtype=1 11:3f:ff:00:00:05],
cid=[01:11:3f:ff:00:00:05], tid=0x67937012, packet details:
local_address=192.168.0.125:67, remote_address=4.0.0.1:67,
msg_type=DHCPDISCOVER (1), transid=0x67937012,

2023-07-20 12:53:20.793 DEBUG [kea-dhcp4.packets/7850.140433344689920]
DHCP4_SUBNET_SELECTED [hwtype=1 11:3f:ff:00:00:05],
cid=[01:11:3f:ff:00:00:05], tid=0x67937012: the subnet with ID 786966
was selected for client assignments

2023-07-20 12:53:20.793 DEBUG [kea-dhcp4.packets/7850.140433344689920]
DHCP4_SUBNET_DATA [hwtype=1 11:3f:ff:00:00:05],
cid=[01:11:3f:ff:00:00:05], tid=0x67937012: the selected subnet
details: 4.0.0.0/16

2023-07-20 12:53:20.793 DEBUG [kea-dhcp4.dhcp4/7850.140433344689920]
DHCP4_CLASS_ASSIGNED [hwtype=1 11:3f:ff:00:00:05],
cid=[01:11:3f:ff:00:00:05], tid=0x67937012: client packet has been
assigned to the following class(es): UNKNOWN

2023-07-20 12:53:20.793 DEBUG [kea-dhcp4.dhcp4/7850.140433344689920]
DHCP4_CLASS_ASSIGNED [hwtype=1 11:3f:ff:00:00:05],
cid=[01:11:3f:ff:00:00:05], tid=0x67937012: client packet has been
assigned to the following class(es): ALL, allow-client, UNKNOWN

2023-07-20 12:53:20.793 DEBUG [kea-dhcp4.ddns/7850.140433344689920]
DHCP4_CLIENT_HOSTNAME_PROCESS [hwtype=1 11:3f:ff:00:00:05],
cid=[01:11:3f:ff:00:00:05], tid=0x67937012: processing client's
Hostname option

2023-07-20 12:53:20.793 DEBUG [kea-dhcp4.ddns/7850.140433344689920]
DHCP4_CLIENT_HOSTNAME_DATA [hwtype=1 11:3f:ff:00:00:05],
cid=[01:11:3f:ff:00:00:05], tid=0x67937012: client sent Hostname
option: dhcp-client-000005

2023-07-20 12:53:20.793 DEBUG [kea-dhcp4.ddns/7850.140433344689920]
DHCP4_CLIENT_HOSTNAME_DATA [hwtype=1 11:3f:ff:00:00:05],
cid=[01:11:3f:ff:00:00:05], tid=0x67937012: client sent Hostname
option: dhcp-client-000005

2023-07-20 12:53:20.793 DEBUG [kea-dhcp4.ddns/7850.140433344689920]
DHCP4_RESPONSE_HOSTNAME_DATA [hwtype=1 11:3f:ff:00:00:05],
cid=[01:11:3f:ff:00:00:05], tid=0x67937012: including Hostname option
in the server's response: dhcp-client-000005

2023-07-20 12:53:20.793 DEBUG
[kea-dhcp4.alloc-engine/7850.140433344689920]
ALLOC_ENGINE_V4_OFFER_NEW_LEASE allocation engine will try to offer
new lease to the client [hwtype=1 11:3f:ff:00:00:05],
cid=[01:11:3f:ff:00:00:05], tid=0x67937012

2023-07-20 12:53:20.850 WARN
[kea-dhcp4.alloc-engine/7850.140433344689920]
ALLOC_ENGINE_V4_ALLOC_FAIL_SUBNET [hwtype=1 11:3f:ff:00:00:05],
cid=[01:11:3f:ff:00:00:05], tid=0x67937012: failed to allocate an IPv4
lease in the subnet 4.0.0.0/16, subnet-id 786966, shared network
(none)

2023-07-20 12:53:20.850 WARN
[kea-dhcp4.alloc-engine/7850.140433344689920]
ALLOC_ENGINE_V4_ALLOC_FAIL [hwtype=1 11:3f:ff:00:00:05],
cid=[01:11:3f:ff:00:00:05], tid=0x67937012: failed to allocate an IPv4
address after 244 attempt(s)

2023-07-20 12:53:20.850 WARN
[kea-dhcp4.alloc-engine/7850.140433344689920]
ALLOC_ENGINE_V4_ALLOC_FAIL_CLASSES [hwtype=1 11:3f:ff:00:00:05],
cid=[01:11:3f:ff:00:00:05], tid=0x67937012: Failed to allocate an IPv4
address for client with classes: ALL, allow-client, UNKNOWN

2023-07-20 12:53:20.850 DEBUG
[kea-dhcp4.bad-packets/7850.140433344689920] DHCP4_PACKET_NAK_0003
[hwtype=1 11:3f:ff:00:00:05], cid=[01:11:3f:ff:00:00:05],
tid=0x67937012: failed to advertise a lease, client sent ciaddr
0.0.0.0, requested-ip-address (no address)

Thank you,

Darren Ankney

On Thu, Jul 20, 2023 at 11:31 AM Kraishak Mahtha <kraishak.edu at gmail.com> wrote:
>
> Hi All,
>
> I have two subnets 3.4.0.0/16 and 4.0.0.0/16 configured on the kea DHCP standalone appliance, It used to work fine able to get leases from both subnets but today, I am not able to get the leases from 4.0.0.0 subnet (3.4.0.0 is working fine and both have same options and that too basic router and lease time...)
> I see the discover packet is being sent to the DHCP appliance but it is not sending any offer, I tried checking the logs I see the server is being tried for different IPs like :
>
> 2023-07-20 12:53:20.766 DEBUG [kea-dhcp4.hosts/7850.140433336297216] HOSTS_CFG_GET_ONE_SUBNET_ID_ADDRESS4 get one host with reservation for subnet id 786966 and IPv4 address 4.0.0.2
> 2023-07-20 12:53:20.766 DEBUG [kea-dhcp4.hosts/7850.140433336297216] HOSTS_CFG_GET_ALL_ADDRESS4 get all hosts with reservations for IPv4 address 4.0.0.2
> 2023-07-20 12:53:20.766 DEBUG [kea-dhcp4.hosts/7850.140433336297216] HOSTS_CFG_GET_ALL_ADDRESS4_COUNT using address 4.0.0.2, found 0 host(s)
> 2023-07-20 12:53:20.766 DEBUG [kea-dhcp4.hosts/7850.140433336297216] HOSTS_CFG_GET_ONE_SUBNET_ID_ADDRESS4_NULL host not found using subnet id 786966 and address 4.0.0.2
> 2023-07-20 12:53:20.766 DEBUG [kea-dhcp4.dhcpsrv/7850.140433336297216] DHCPSRV_MEMFILE_GET_ADDR4 obtaining IPv4 lease for address 4.0.0.2
> 2023-07-20 12:53:20.766 DEBUG [kea-dhcp4.hosts/7850.140433336297216] HOSTS_CFG_GET_ONE_SUBNET_ID_ADDRESS4 get one host with reservation for subnet id 786966 and IPv4 address 4.0.0.3
> 2023-07-20 12:53:20.766 DEBUG [kea-dhcp4.hosts/7850.140433336297216] HOSTS_CFG_GET_ALL_ADDRESS4 get all hosts with reservations for IPv4 address 4.0.0.3
> 2023-07-20 12:53:20.766 DEBUG [kea-dhcp4.hosts/7850.140433336297216] HOSTS_CFG_GET_ALL_ADDRESS4_COUNT using address 4.0.0.3, found 0 host(s)
> 2023-07-20 12:53:20.766 DEBUG [kea-dhcp4.hosts/7850.140433336297216] HOSTS_CFG_GET_ONE_SUBNET_ID_ADDRESS4_NULL host not found using subnet id 786966 and address 4.0.0.3
> 2023-07-20 12:53:20.766 DEBUG [kea-dhcp4.dhcpsrv/7850.140433336297216] DHCPSRV_MEMFILE_GET_ADDR4 obtaining IPv4 lease for address 4.0.0.3
> 2023-07-20 12:53:20.766 DEBUG [kea-dhcp4.hosts/7850.140433336297216] HOSTS_CFG_GET_ONE_SUBNET_ID_ADDRESS4 get one host with reservation for subnet id 786966 and IPv4 address 4.0.0.4
> 2023-07-20 12:53:20.766 DEBUG [kea-dhcp4.hosts/7850.140433336297216] HOSTS_CFG_GET_ALL_ADDRESS4 get all hosts with reservations for IPv4 address 4.0.0.4
> 2023-07-20 12:53:20.766 DEBUG [kea-dhcp4.hosts/7850.140433336297216] HOSTS_CFG_GET_ALL_ADDRESS4_COUNT using address 4.0.0.4, found 0 host(s)
> 2023-07-20 12:53:20.766 DEBUG [kea-dhcp4.hosts/7850.140433336297216] HOSTS_CFG_GET_ONE_SUBNET_ID_ADDRESS4_NULL host not found using subnet id 786966 and address 4.0.0.4
> 2023-07-20 12:53:20.766 DEBUG [kea-dhcp4.dhcpsrv/7850.140433336297216] DHCPSRV_MEMFILE_GET_ADDR4 obtaining IPv4 lease for address 4.0.0.4
> 2023-07-20 12:53:20.766 DEBUG [kea-dhcp4.hosts/7850.140433336297216] HOSTS_CFG_GET_ONE_SUBNET_ID_ADDRESS4 get one host with reservation for subnet id 786966 and IPv4 address 4.0.0.5
> 2023-07-20 12:53:20.766 DEBUG [kea-dhcp4.hosts/7850.140433336297216] HOSTS_CFG_GET_ALL_ADDRESS4 get all hosts with reservations for IPv4 address 4.0.0.5
> 2023-07-20 12:53:20.766 DEBUG [kea-dhcp4.hosts/7850.140433336297216] HOSTS_CFG_GET_ALL_ADDRESS4_COUNT using address 4.0.0.5, found 0 host(s)
> 2023-07-20 12:53:20.766 DEBUG [kea-dhcp4.hosts/7850.140433336297216] HOSTS_CFG_GET_ONE_SUBNET_ID_ADDRESS4_NULL host not found using subnet id 786966 and address 4.0.0.5
> 2023-07-20 12:53:20.766 DEBUG [kea-dhcp4.dhcpsrv/7850.140433336297216] DHCPSRV_MEMFILE_GET_ADDR4 obtaining IPv4 lease for address 4.0.0.5
>
>
> I thought it would be because that IP is being used but in the network, I don't see anyone having IP with that and also kea won't do ping before offering to my knowledge.
>
> Please find the attached log files for more info on kea-dhcp4 and kea-dhcp4.packets module.
>
> Overview summary
> Subnet 4.0.0.0 has a MAC address with a pattern: 11:3f:ff****
> Subnet 3.4.0.0 has a MAC address with a pattern: 14:3f:ff:***
>
> Can some mean please guide why the server is unable to offer leases for the 4.0.0.0 subnet
>
> Thanks in Advance
> Kraishak
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