kea: failed to select a subnet for incoming packet

[Raj raj]

Dear List,

I am testing kea (0.9.2) in my environment as my DHCP server. One
peculiarity  is that all clients are in a VLAN and  DHCP server must
listen on a vlan interface for DHCP packets. I have configured the kea
config file accordingly and the server is receiving DHCPDISCOVER
packet. But it is not responding to DHCPDISCOVER and bails out with
the following error message.

2015-09-14 19:34:25.852 ERROR [kea-dhcp4.bad-packets/29128]
DHCP4_PACKET_NAK_0001 [hwtype=1 a0:36:9f:41:b6:3a], cid=[no info],
tid=0xc28b7213: failed to select a subnet for incoming packet, src
192.168.200.79, type DHCPDISCOVER

The dhcp4 section of the config file is as follows:

"Dhcp4":
{
# Add names of interfaces to listen on.
"interfaces-config": {
"interfaces": ["vlan0/192.168.200.1","eth0"]
},

# Use Memfile lease database backend to store leases in a CSV file.
"lease-database": {
"type": "memfile"
},

# Global (inherited by all subnets) lease lifetime is mandatory parameter.
"valid-lifetime": 4000,

# Below an example of the simple subnet declaration. Uncomment to
# enable it. This is a list, denoted with [ ], of structure, denoted
# with { }. Each structure describes a single subnet and may have
# several parameters. One of those parameters is "pools" that is
# also a list of structures.
"subnet4": [
{ "subnet": "192.0.2.0/24",
"pools": [ { "pool": "192.0.2.1 - 192.0.2.200" } ] }
]
}

my interface list is as follows:

eth0 Link encap:Ethernet HWaddr f8:a9:63:0c:3c:cb
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:653 errors:0 dropped:0 overruns:0 frame:0
TX packets:4085 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:187646 (187.6 KB) TX bytes:813585 (813.5 KB)

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:3621 errors:0 dropped:0 overruns:0 frame:0
TX packets:3621 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:310760 (310.7 KB) TX bytes:310760 (310.7 KB)

vlan0 Link encap:Ethernet HWaddr f8:a9:63:0c:3c:cb
inet addr:192.168.200.1 Bcast:192.168.200.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:653 errors:0 dropped:0 overruns:0 frame:0
TX packets:285 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:175892 (175.8 KB) TX bytes:54628 (54.6 KB)

wlan0 Link encap:Ethernet HWaddr b8:ee:65:23:4f:4b
inet addr:192.168.13.157 Bcast:192.168.13.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:30638 errors:0 dropped:0 overruns:0 frame:0
TX packets:15842 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:23644283 (23.6 MB) TX bytes:1962670 (1.9 MB)

As you can see the vlan0 is configured with 192.168.200.1/24. The dhcp
requests are being relayed by 192.168.200.79. I am not able to figure
out what am I doing wrong here.

Help to resolve this will be much appreciated.

Thanks and Regards,

Raj