I'm trying to configure two separate subnets in kea, one with a prefix
delegation pool and another with an address pool and running into some
difficulties. I am following the guide for 1.4.0 here (and running kea
1.4.0-P1):
https://ftp.isc.org/isc/kea/1.4.0/doc/kea-guide.html#dhcp6-address-config
With the following configuration, my client can successfully request prefix
delegation, but if they try to do IA_NA the server responds with "Sorry, no
address could be allocated." The odd part about this is that if I swap the
ordering of the subnets below (i.e., 2001:db8:2::/64 comes first with its
corresponding pool), the client will be able to do IA_NA but not prefix
delegation with the error "Sorry, no prefixes could be allocated."
I have some debug logs below for the two cases. It appears as though the second
subnet is ignored in each case, but the kea admin guide seems to indicate that
this is a valid configuration choice.
{
"Dhcp6": {
"lease-database": {
"type": "memfile",
"persist": true,
"name": "/var/run/kea-leases6.csv",
"lfc-interval": 1800
},
"interfaces-config": {
"interfaces": [
"eth0/2001:db8::1",
"eth0/2001:db8::2",
]
},
"subnet6": [
{
"subnet": "2001:db8:1::/64",
"pd-pools": [
{
"prefix": "3000:1::",
"prefix-len": 64,
"delegated-len": 96
}
],
"interface": "eth0",
"option-data": []
},
{
"subnet": "2001:db8:2::/64",
"pools": [
{
"pool": "2001:db8:2::/64"
}
],
"interface": "eth0",
"option-data": []
}
]
}
}
With the 2001:db8:2::/64 address pool first, a PD request from client logs:
---------------------------------------------------------------
2018-11-15 07:55:21.708 DEBUG [kea-dhcp6.packets/2110445] DHCP6_BUFFER_RECEIVED
received buffer from fe80::f2ff:fe40:f5d:546 to ff02::1:2:0 over interface eth0
2018-11-15 07:55:21.708 DEBUG [kea-dhcp6.options/2110445] DHCP6_BUFFER_UNPACK
parsing buffer received from fe80::f2ff:fe40:f5d to ff02::1:2 over interface
eth0
2018-11-15 07:55:21.708 DEBUG [kea-dhcp6.packets/2110445] DHCP6_PACKET_RECEIVED
duid=[00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d], tid=0xf29805: SOLICIT (type
1) received from fe80::f2ff:fe40:f5d to ff02::1:2 on interface eth0
2018-11-15 07:55:21.708 DEBUG [kea-dhcp6.packets/2110445] DHCP6_QUERY_DATA
duid=[00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d], tid=0xf29805, packet details:
localAddr=[ff02::1:2]:0 remoteAddr=[fe80::f2ff:fe40:f5d]:546
msgtype=1(SOLICIT), transid=0xf29805
type=00001, len=00014: 00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d
type=00006, len=00004: 23(uint16) 24(uint16)
type=00008, len=00002: 762 (uint16)
type=00025(IA_PD), len=00012: iaid=4064284509, t1=3600, t2=5400
No relays traversed.
2018-11-15 07:55:21.709 DEBUG [kea-dhcp6.dhcpsrv/2110445]
DHCPSRV_CFGMGR_SUBNET6_IFACE selected subnet 2001:db8:2::/64 for packet
received over interface eth0
2018-11-15 07:55:21.709 DEBUG [kea-dhcp6.packets/2110445] DHCP6_SUBNET_SELECTED
duid=[00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d], tid=0xf29805: the subnet with
ID 1 was selected for client assignments
2018-11-15 07:55:21.709 DEBUG [kea-dhcp6.packets/2110445] DHCP6_SUBNET_DATA
duid=[00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d], tid=0xf29805: the selected
subnet details: 2001:db8:2::/64
2018-11-15 07:55:21.709 DEBUG [kea-dhcp6.hosts/2110445]
HOSTS_CFG_GET_ONE_SUBNET_ID_IDENTIFIER get one host with IPv6 reservation for
subnet id 1, identified by hwaddr=0200F2400F5D
2018-11-15 07:55:21.709 DEBUG [kea-dhcp6.hosts/2110445]
HOSTS_CFG_GET_ALL_IDENTIFIER get all hosts with reservations using identifier:
hwaddr=0200F2400F5D
2018-11-15 07:55:21.709 DEBUG [kea-dhcp6.hosts/2110445]
HOSTS_CFG_GET_ALL_IDENTIFIER_COUNT using identifier hwaddr=0200F2400F5D, found
0 host(s)
2018-11-15 07:55:21.709 DEBUG [kea-dhcp6.hosts/2110445]
HOSTS_CFG_GET_ONE_SUBNET_ID_IDENTIFIER_NULL host not found using subnet id 1
and identifier hwaddr=0200F2400F5D
2018-11-15 07:55:21.709 DEBUG [kea-dhcp6.hosts/2110445]
HOSTS_CFG_GET_ONE_SUBNET_ID_IDENTIFIER get one host with IPv6 reservation for
subnet id 1, identified by duid=000100012378A1980200F2400F5D
2018-11-15 07:55:21.709 DEBUG [kea-dhcp6.hosts/2110445]
HOSTS_CFG_GET_ALL_IDENTIFIER get all hosts with reservations using identifier:
duid=000100012378A1980200F2400F5D
2018-11-15 07:55:21.709 DEBUG [kea-dhcp6.hosts/2110445]
HOSTS_CFG_GET_ALL_IDENTIFIER_COUNT using identifier
duid=000100012378A1980200F2400F5D, found 0 host(s)
2018-11-15 07:55:21.709 DEBUG [kea-dhcp6.hosts/2110445]
HOSTS_CFG_GET_ONE_SUBNET_ID_IDENTIFIER_NULL host not found using subnet id 1
and identifier duid=000100012378A1980200F2400F5D
2018-11-15 07:55:21.709 DEBUG [kea-dhcp6.dhcp6/2110445] DHCP6_CLASS_ASSIGNED
duid=[00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d], tid=0xf29805: client packet
has been assigned to the following class(es): UNKNOWN
2018-11-15 07:55:21.709 DEBUG [kea-dhcp6.leases/2110445]
DHCP6_PROCESS_IA_PD_REQUEST duid=[00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d],
tid=0xf29805: server is processing IA_PD option with iaid=4064284509 and
hint=(no hint)
2018-11-15 07:55:21.709 DEBUG [kea-dhcp6.dhcpsrv/2110445]
DHCPSRV_MEMFILE_GET_IAID_DUID obtaining IPv6 leases for IAID 4064284509 and
DUID 00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d and lease type IA_PD
2018-11-15 07:55:21.709 DEBUG [kea-dhcp6.alloc-engine/2110445]
ALLOC_ENGINE_V6_ALLOC_UNRESERVED no static reservations available - trying to
dynamically allocate leases for client
duid=[00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d], tid=0xf29805
2018-11-15 07:55:21.709 WARN [kea-dhcp6.alloc-engine/2110445]
ALLOC_ENGINE_V6_ALLOC_FAIL duid=[00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d],
tid=0xf29805: failed to allocate an IPv6 address after 0 attempt(s)
2018-11-15 07:55:21.709 DEBUG [kea-dhcp6.leases/2110445]
DHCP6_PD_LEASE_ADVERT_FAIL duid=[00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d],
tid=0xf29805: failed to advertise a prefix lease for iaid=4064284509
2018-11-15 07:55:21.709 DEBUG [kea-dhcp6.options/2110445]
DHCP6_ADD_STATUS_CODE_FOR_IA duid=[00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d],
tid=0xf29805: adding Status Code to IA with iaid=4064284509: NoPrefixAvail(6)
"Sorry, no prefixes could be allocated."
2018-11-15 07:55:21.709 DEBUG [kea-dhcp6.dhcp6/2110445] DHCP6_CLASS_ASSIGNED
duid=[00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d], tid=0xf29805: client packet
has been assigned to the following class(es): ALL, UNKNOWN
2018-11-15 07:55:21.709 DEBUG [kea-dhcp6.packets/2110445] DHCP6_RESPONSE_DATA
responding with packet type 2 data is localAddr=[ff02::1:2]:547
remoteAddr=[fe80::f2ff:fe40:f5d]:546
msgtype=2(ADVERTISE), transid=0xf29805
type=00001, len=00014: 00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d
type=00002, len=00014: 00:01:00:01:23:78:a1:07:02:00:d0:26:ab:4e
type=00025(IA_PD), len=00056: iaid=4064284509, t1=0, t2=0,
options:
type=00013, len=00040: NoPrefixAvail(6) "Sorry, no prefixes could be
allocated."
No relays traversed.
With the 2001:db8:1::/64 PD pool first, an IA_NA request from client logs:
---------------------------------------------------------------
2018-11-15 07:57:27.876 DEBUG [kea-dhcp6.packets/2110445] DHCP6_BUFFER_RECEIVED
received buffer from fe80::f2ff:fe40:f5d:546 to ff02::1:2:0 over interface eth0
2018-11-15 07:57:27.876 DEBUG [kea-dhcp6.options/2110445] DHCP6_BUFFER_UNPACK
parsing buffer received from fe80::f2ff:fe40:f5d to ff02::1:2 over interface
eth0
2018-11-15 07:57:27.876 DEBUG [kea-dhcp6.packets/2110445] DHCP6_PACKET_RECEIVED
duid=[00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d], tid=0x1ae9c4: SOLICIT (type
1) received from fe80::f2ff:fe40:f5d to ff02::1:2 on interface eth0
2018-11-15 07:57:27.877 DEBUG [kea-dhcp6.packets/2110445] DHCP6_QUERY_DATA
duid=[00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d], tid=0x1ae9c4, packet details:
localAddr=[ff02::1:2]:0 remoteAddr=[fe80::f2ff:fe40:f5d]:546
msgtype=1(SOLICIT), transid=0x1ae9c4
type=00001, len=00014: 00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d
type=00003(IA_NA), len=00012: iaid=4064284509, t1=3600, t2=5400
type=00006, len=00004: 23(uint16) 24(uint16)
type=00008, len=00002: 687 (uint16)
No relays traversed.
2018-11-15 07:57:27.877 DEBUG [kea-dhcp6.dhcpsrv/2110445]
DHCPSRV_CFGMGR_SUBNET6_IFACE selected subnet 2001:db8:1::/64 for packet
received over interface eth0
2018-11-15 07:57:27.877 DEBUG [kea-dhcp6.packets/2110445] DHCP6_SUBNET_SELECTED
duid=[00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d], tid=0x1ae9c4: the subnet with
ID 1 was selected for client assignments
2018-11-15 07:57:27.877 DEBUG [kea-dhcp6.packets/2110445] DHCP6_SUBNET_DATA
duid=[00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d], tid=0x1ae9c4: the selected
subnet details: 2001:db8:1::/64
2018-11-15 07:57:27.877 DEBUG [kea-dhcp6.hosts/2110445]
HOSTS_CFG_GET_ONE_SUBNET_ID_IDENTIFIER get one host with IPv6 reservation for
subnet id 1, identified by hwaddr=0200F2400F5D
2018-11-15 07:57:27.877 DEBUG [kea-dhcp6.hosts/2110445]
HOSTS_CFG_GET_ALL_IDENTIFIER get all hosts with reservations using identifier:
hwaddr=0200F2400F5D
2018-11-15 07:57:27.877 DEBUG [kea-dhcp6.hosts/2110445]
HOSTS_CFG_GET_ALL_IDENTIFIER_COUNT using identifier hwaddr=0200F2400F5D, found
0 host(s)
2018-11-15 07:57:27.877 DEBUG [kea-dhcp6.hosts/2110445]
HOSTS_CFG_GET_ONE_SUBNET_ID_IDENTIFIER_NULL host not found using subnet id 1
and identifier hwaddr=0200F2400F5D
2018-11-15 07:57:27.877 DEBUG [kea-dhcp6.hosts/2110445]
HOSTS_CFG_GET_ONE_SUBNET_ID_IDENTIFIER get one host with IPv6 reservation for
subnet id 1, identified by duid=000100012378A1980200F2400F5D
2018-11-15 07:57:27.877 DEBUG [kea-dhcp6.hosts/2110445]
HOSTS_CFG_GET_ALL_IDENTIFIER get all hosts with reservations using identifier:
duid=000100012378A1980200F2400F5D
2018-11-15 07:57:27.877 DEBUG [kea-dhcp6.hosts/2110445]
HOSTS_CFG_GET_ALL_IDENTIFIER_COUNT using identifier
duid=000100012378A1980200F2400F5D, found 0 host(s)
2018-11-15 07:57:27.877 DEBUG [kea-dhcp6.hosts/2110445]
HOSTS_CFG_GET_ONE_SUBNET_ID_IDENTIFIER_NULL host not found using subnet id 1
and identifier duid=000100012378A1980200F2400F5D
2018-11-15 07:57:27.877 DEBUG [kea-dhcp6.dhcp6/2110445] DHCP6_CLASS_ASSIGNED
duid=[00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d], tid=0x1ae9c4: client packet
has been assigned to the following class(es): UNKNOWN
2018-11-15 07:57:27.877 DEBUG [kea-dhcp6.leases/2110445]
DHCP6_PROCESS_IA_NA_REQUEST duid=[00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d],
tid=0x1ae9c4: server is processing IA_NA option with iaid=4064284509 and
hint=(no hint)
2018-11-15 07:57:27.877 DEBUG [kea-dhcp6.dhcpsrv/2110445]
DHCPSRV_MEMFILE_GET_IAID_DUID obtaining IPv6 leases for IAID 4064284509 and
DUID 00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d and lease type IA_NA
2018-11-15 07:57:27.877 DEBUG [kea-dhcp6.alloc-engine/2110445]
ALLOC_ENGINE_V6_ALLOC_UNRESERVED no static reservations available - trying to
dynamically allocate leases for client
duid=[00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d], tid=0x1ae9c4
2018-11-15 07:57:27.877 WARN [kea-dhcp6.alloc-engine/2110445]
ALLOC_ENGINE_V6_ALLOC_FAIL duid=[00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d],
tid=0x1ae9c4: failed to allocate an IPv6 address after 0 attempt(s)
2018-11-15 07:57:27.877 DEBUG [kea-dhcp6.leases/2110445]
DHCP6_LEASE_ADVERT_FAIL duid=[00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d],
tid=0x1ae9c4: failed to advertise an address lease for iaid=4064284509
2018-11-15 07:57:27.877 DEBUG [kea-dhcp6.options/2110445]
DHCP6_ADD_STATUS_CODE_FOR_IA duid=[00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d],
tid=0x1ae9c4: adding Status Code to IA with iaid=4064284509: NoAddrsAvail(2)
"Sorry, no address could be allocated."
2018-11-15 07:57:27.877 DEBUG [kea-dhcp6.dhcp6/2110445] DHCP6_CLASS_ASSIGNED
duid=[00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d], tid=0x1ae9c4: client packet
has been assigned to the following class(es): ALL, UNKNOWN
2018-11-15 07:57:27.877 DEBUG [kea-dhcp6.packets/2110445] DHCP6_RESPONSE_DATA
responding with packet type 2 data is localAddr=[ff02::1:2]:547
remoteAddr=[fe80::f2ff:fe40:f5d]:546
msgtype=2(ADVERTISE), transid=0x1ae9c4
type=00001, len=00014: 00:01:00:01:23:78:a1:98:02:00:f2:40:0f:5d
type=00002, len=00014: 00:01:00:01:23:78:a1:07:02:00:d0:26:ab:4e
type=00003(IA_NA), len=00055: iaid=4064284509, t1=0, t2=0,
options:
type=00013, len=00039: NoAddrsAvail(2) "Sorry, no address could be allocated."
No relays traversed.
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