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

Fri Jul 21 12:59:15 UTC 2023

Hi Darren,
That is where I get doubts I see only one lease from that 4.0.0.0 subnet
when I execute this command
/usr/bin/echo '{"command":"lease4-get-all"}' | /usr/bin/socat -
UNIX:/tmp/kea4-ctrl-socket and that is also the day before yesterday's one
where it worked fine.
And we have around 150+ Ip's still available from that subnet

Thanks Kraishak

On Thu, Jul 20, 2023 at 11:47 PM Darren Ankney <darren.ankney at gmail.com>
wrote:

> 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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