Hi guys,
We are currently in a migration scenario from the old ISC DHCP to KEA DHCP and
having some troubles with NAKs. Hopefully you can help me to clarify the
situation.
To have a smooth transition we want to have both DHCPs serving requests for the
known clients.
Our idea was to disable “authoritative” and the new KEA should stay silent on
non migrated devices.
It seems to work partly as it stays silent on DISCOVERS, but for RENEWs it does
not work. Our KEA is sending NAKs which causes that some client do not retry to
get an ip address and the customers need to reboot their devices.
What’s the intended behaviour and are the any ideas to solve the task? Is there
a way to disable NAKs completely?
Thank you,
Mathias
Kea 1.5
All the subnets are added to the shared network but without dynamic pool
"shared-networks": [
{
"authoritative": false,
"match-client-id": true,
"name": "DOCSIS",
"option-data": [],
"relay": {
"ip-addresses": []
},
"reservation-mode": "all",
"subnet4": [
{
"4o6-interface": "",
"4o6-interface-id": "",
"4o6-subnet": "",
"authoritative": false,
"boot-file-name": "",
"client-class": "docsis-devices",
"id": 1,
"match-client-id": true,
"next-server": “xxxxxxxxx",
"option-data": [
{
"always-send": false,
"code": 3,
"csv-format": true,
"data": "xxxxxxxxx",
"name": "routers",
"space": "dhcp4"
},
{
"always-send": false,
"code": 4,
"csv-format": true,
"data": "xxxxxxxxx",
"name": "time-servers",
"space": "dhcp4"
},
{
"always-send": false,
"code": 42,
"csv-format": true,
"data": "xxxxxxxxx",
"name": "ntp-servers",
"space": "dhcp4"
},
{
"always-send": false,
"code": 2,
"csv-format": true,
"data": "7200",
"name": "time-offset",
"space": "dhcp4"
}
],
"pools": [
{
"client-class": "KNOWN",
"option-data": [],
"pool": "xxxxxxxxx-xxxxxxxxx"
}
],
"rebind-timer": 6300,
"relay": {
"ip-addresses": [
"xxxxxxxxx"
]
},
"renew-timer": 3600,
"reservation-mode": "all",
"reservations": [],
"server-hostname": "",
"subnet": "xxxxxxxxx/16",
"valid-lifetime": 7200
},
{
"4o6-interface": "",
"4o6-interface-id": "",
"4o6-subnet": "",
"authoritative": false,
"boot-file-name": "",
"id": 2,
"match-client-id": true,
"next-server": "0.0.0.0",
"option-data": [
{
"always-send": false,
"code": 3,
"csv-format": true,
"data": "xxxxxxxxx",
"name": "routers",
"space": "dhcp4"
},
{
"always-send": false,
"code": 2,
"csv-format": true,
"data": "7200",
"name": "time-offset",
"space": "dhcp4"
}
],
"pools": [],
"rebind-timer": 6300,
"relay": {
"ip-addresses": [
"xxxxxxxxx"
]
}
….
Output:
2019-03-25 15:03:47.720 DEBUG [kea-dhcp4.packets/16201] DHCP4_PACKET_RECEIVED
[hwtype=1 aa:aa:aa:aa:aa:aa],
cid=[bb:bb:bb:bb:bb:bb:bb:bb:bb:aa:aa:aa:aa:aa:aa], tid=0x103ed2fd: DHCPREQUEST
(type 3) received from 111.111.111.111 to 222.222.222.222 on interface ens160
2019-03-25 15:03:47.721 DEBUG [kea-dhcp4.packets/16201] DHCP4_QUERY_DATA
[hwtype=1 aa:aa:aa:aa:aa:aa],
cid=[bb:bb:bb:bb:bb:bb:bb:bb:bb:aa:aa:aa:aa:aa:aa], tid=0x103ed2fd, packet
details: local_address=222.222.222.222:67, remote_address=111.111.111.111:67,
msg_type=DHCPREQUEST (3), transid=0x103ed2fd,
options:
type=053, len=001: 3 (uint8)
type=055, len=014: 72(uint8) 1(uint8) 2(uint8) 3(uint8) 4(uint8) 6(uint8)
7(uint8) 12(uint8) 15(uint8) 23(uint8) 26(uint8) 54(uint8) 51(uint8) 125(uint8)
type=057, len=002: 1500 (uint16)
type=061, len=015: bb:bb:bb:bb:bb:bb:bb:bb:bb:aa:aa:aa:aa:aa:aa
type=082, len=033:,
options:
....
2019-03-25 15:03:47.721 DEBUG [kea-dhcp4.callouts/16201] HOOKS_CALLOUTS_BEGIN
begin all callouts for hook pkt4_receive
2019-03-25 15:03:47.721 DEBUG [kea-dhcp4.callouts/16201] HOOKS_CALLOUT_CALLED
hooks library with index 3 has called a callout on hook pkt4_receive that has
address 0xBBBBBBBBB (callout duration: 0.134 ms)
2019-03-25 15:03:47.721 DEBUG [kea-dhcp4.callouts/16201]
HOOKS_CALLOUTS_COMPLETE completed callouts for hook pkt4_receive (total
callouts duration: 0.134 ms)
2019-03-25 15:03:47.721 DEBUG [kea-dhcp4.packets/16201] DHCP4_SUBNET_SELECTED
[hwtype=1 aa:aa:aa:aa:aa:aa],
cid=[bb:bb:bb:bb:bb:bb:bb:bb:bb:aa:aa:aa:aa:aa:aa], tid=0xBBBBBBBBB: the subnet
with ID 2 was selected for client assignments
2019-03-25 15:03:47.721 DEBUG [kea-dhcp4.packets/16201] DHCP4_SUBNET_DATA
[hwtype=1 aa:aa:aa:aa:aa:aa],
cid=[bb:bb:bb:bb:bb:bb:bb:bb:bb:aa:aa:aa:aa:aa:aa], tid=0xBBBBBBBBB: the
selected subnet details: 111.111.111.111/24
2019-03-25 15:03:47.721 DEBUG [kea-dhcp4.callouts/16201] HOOKS_CALLOUTS_BEGIN
begin all callouts for hook host4_identifier
2019-03-25 15:03:47.722 DEBUG [kea-dhcp4.eval/16201] EVAL_DEBUG_OPTION Pushing
option 2 with value 0xAAAAAAAAAAA
2019-03-25 15:03:47.722 DEBUG [kea-dhcp4.eval/16201] EVAL_DEBUG_STRING Pushing
text string '0'
2019-03-25 15:03:47.722 DEBUG [kea-dhcp4.eval/16201] EVAL_DEBUG_STRING Pushing
text string '12'
2019-03-25 15:03:47.722 DEBUG [kea-dhcp4.eval/16201] EVAL_DEBUG_SUBSTRING
Popping length 12, start 0, string 0xAAAAAAAAAAA pushing result 0xAAAAAAAAAAA
2019-03-25 15:03:47.722 DEBUG [kea-dhcp4.callouts/16201] HOOKS_CALLOUT_CALLED
hooks library with index 3 has called a callout on hook host4_identifier that
has address 0xAAAAAAAAAAA (callout duration: 0.677 ms)
2019-03-25 15:03:47.722 DEBUG [kea-dhcp4.callouts/16201]
HOOKS_CALLOUTS_COMPLETE completed callouts for hook host4_identifier (total
callouts duration: 0.677 ms)
2019-03-25 15:03:47.722 DEBUG [kea-dhcp4.hosts/16201]
HOSTS_CFG_GET_ALL_IDENTIFIER get all hosts with reservations using identifier:
hwaddr=0xAAAAAAAAAAA
2019-03-25 15:03:47.722 DEBUG [kea-dhcp4.hosts/16201]
HOSTS_CFG_GET_ALL_IDENTIFIER_COUNT using identifier hwaddr=AAAAAAAAAAA, found 0
host(s)
2019-03-25 15:03:47.723 DEBUG [kea-dhcp4.hosts/16201]
HOSTS_CFG_GET_ALL_IDENTIFIER get all hosts with reservations using identifier:
duid=AAAAAAAAAAAAAAAAAAAAAA
2019-03-25 15:03:47.723 DEBUG [kea-dhcp4.hosts/16201]
HOSTS_CFG_GET_ALL_IDENTIFIER_COUNT using identifier duid=00030001AAAAAAAAAAA,
found 0 host(s)
2019-03-25 15:03:47.723 DEBUG [kea-dhcp4.hosts/16201]
HOSTS_CFG_GET_ALL_IDENTIFIER get all hosts with reservations using identifier:
circuit-id=0xAAAAAAAA
2019-03-25 15:03:47.723 DEBUG [kea-dhcp4.hosts/16201]
HOSTS_CFG_GET_ALL_IDENTIFIER_COUNT using identifier circuit-id=BBBBBBBBB, found
0 host(s)
2019-03-25 15:03:47.724 DEBUG [kea-dhcp4.hosts/16201]
HOSTS_CFG_GET_ALL_IDENTIFIER get all hosts with reservations using identifier:
client-id=AAAAAAAAAAAAAAAAAAAAAA
2019-03-25 15:03:47.724 DEBUG [kea-dhcp4.hosts/16201]
HOSTS_CFG_GET_ALL_IDENTIFIER_COUNT using identifier
client-id=BBBBBBBBBBBBBBBBBAAAAAAAAAAA, found 0 host(s)
2019-03-25 15:03:47.724 DEBUG [kea-dhcp4.hosts/16201]
HOSTS_CFG_GET_ALL_IDENTIFIER get all hosts with reservations using identifier:
flex-id=AAAAAAAAAAAA
2019-03-25 15:03:47.724 DEBUG [kea-dhcp4.hosts/16201]
HOSTS_CFG_GET_ALL_IDENTIFIER_COUNT using identifier flex-id=AAAAAAAAAAAA, found
0 host(s)
2019-03-25 15:03:47.725 DEBUG [kea-dhcp4.dhcp4/16201] DHCP4_CLASS_ASSIGNED
[hwtype=1 aa:aa:aa:aa:aa:aa],
cid=[bb:bb:bb:bb:bb:bb:bb:bb:bb:aa:aa:aa:aa:aa:aa], tid=0xBBBBBBBBB: client
packet has been assigned to the following class(es): UNKNOWN
2019-03-25 15:03:47.725 DEBUG [kea-dhcp4.dhcp4/16201] DHCP4_CLASS_ASSIGNED
[hwtype=1 aa:aa:aa:aa:aa:aa],
cid=[bb:bb:bb:bb:bb:bb:bb:bb:bb:aa:aa:aa:aa:aa:aa], tid=0xBBBBBBBBB: client
packet has been assigned to the following class(es): ALL, cpe, UNKNOWN
2019-03-25 15:03:47.725 DEBUG [kea-dhcp4.ddns/16201]
DHCP4_CLIENT_HOSTNAME_PROCESS [hwtype=1 aa:aa:aa:aa:aa:aa],
cid=[bb:bb:bb:bb:bb:bb:bb:bb:bb:aa:aa:aa:aa:aa:aa], tid=0xBBBBBBBBB: processing
client's Hostname option
2019-03-25 15:03:47.725 DEBUG [kea-dhcp4.dhcpsrv/16201]
DHCPSRV_PGSQL_GET_CLIENTID obtaining IPv4 leases for client ID
bb:bb:bb:bb:bb:bb:bb:bb:bb:aa:aa:aa:aa:aa:aa
2019-03-25 15:03:47.725 DEBUG [kea-dhcp4.dhcpsrv/16201]
DHCPSRV_PGSQL_GET_HWADDR obtaining IPv4 leases for hardware address hwtype=1
aa:aa:aa:aa:aa:aa
2019-03-25 15:03:47.726 DEBUG [kea-dhcp4.hosts/16201]
HOSTS_CFG_GET_ONE_SUBNET_ID_ADDRESS4 get one host with reservation for subnet
id 2 and IPv4 address 333.333.333.333
2019-03-25 15:03:47.726 DEBUG [kea-dhcp4.hosts/16201]
HOSTS_CFG_GET_ALL_ADDRESS4 get all hosts with reservations for IPv4 address
333.333.333.333
2019-03-25 15:03:47.726 DEBUG [kea-dhcp4.hosts/16201]
HOSTS_CFG_GET_ALL_ADDRESS4_COUNT using address 333.333.333.333, found 0 host(s)
2019-03-25 15:03:47.726 DEBUG [kea-dhcp4.hosts/16201]
HOSTS_CFG_GET_ONE_SUBNET_ID_ADDRESS4_NULL host not found using subnet id 2 and
address 333.333.333.333
2019-03-25 15:03:47.726 DEBUG [kea-dhcp4.hosts/16201]
HOSTS_MGR_ALTERNATE_GET4_SUBNET_ID_ADDRESS4 trying alternate sources for host
using subnet id 2 and address 333.333.333.333
2019-03-25 15:03:47.726 DEBUG [kea-dhcp4.dhcpsrv/16201] DHCPSRV_PGSQL_GET_ADDR4
obtaining IPv4 lease for address 333.333.333.333
2019-03-25 15:03:47.727 DEBUG [kea-dhcp4.alloc-engine/16201]
ALLOC_ENGINE_V4_REQUEST_OUT_OF_POOL client [hwtype=1 aa:aa:aa:aa:aa:aa],
cid=[bb:bb:bb:bb:bb:bb:bb:bb:bb:aa:aa:aa:aa:aa:aa], tid=0xBBBBBBBBB, which
doesn't have a reservation, requested address 333.333.333.333 out of the
dynamic pool
2019-03-25 15:03:47.727 DEBUG [kea-dhcp4.bad-packets/16201]
DHCP4_PACKET_NAK_0004 [hwtype=1 aa:aa:aa:aa:aa:aa],
cid=[bb:bb:bb:bb:bb:bb:bb:bb:bb:aa:aa:aa:aa:aa:aa], tid=0xBBBBBBBBB failed to
grant a lease, client sent ciaddr 333.333.333.333, requested-ip-address (no
address)
2019-03-25 15:03:47.727 DEBUG [kea-dhcp4.callouts/16201] HOOKS_CALLOUTS_BEGIN
begin all callouts for hook pkt4_send
2019-03-25 15:03:47.727 DEBUG [kea-dhcp4.callouts/16201] HOOKS_CALLOUT_CALLED
hooks library with index 3 has called a callout on hook pkt4_send that has
address 0xAAAAAAAAAAA (callout duration: 0.127 ms)
2019-03-25 15:03:47.727 DEBUG [kea-dhcp4.callouts/16201]
HOOKS_CALLOUTS_COMPLETE completed callouts for hook pkt4_send (total callouts
duration: 0.127 ms)
2019-03-25 15:03:47.727 DEBUG [kea-dhcp4.options/16201] DHCP4_PACKET_PACK
[hwtype=1 aa:aa:aa:aa:aa:aa], cid=[no info], tid=0xBBBBBBBBB: preparing on-wire
format of the packet to be sent
2019-03-25 15:03:47.727 DEBUG [kea-dhcp4.packets/16201] DHCP4_PACKET_SEND
[hwtype=1 aa:aa:aa:aa:aa:aa], cid=[no info], tid=0xBBBBBBBBB: trying to send
packet DHCPNAK (type 6) from 222.222.222.222:67 to 111.111.111.111:67 on
interface ens160
2019-03-25 15:03:47.727 DEBUG [kea-dhcp4.packets/16201] DHCP4_RESPONSE_DATA
[hwtype=1 aa:aa:aa:aa:aa:aa], cid=[no info], tid=0xBBBBBBBBB: responding with
packet DHCPNAK (type 6), packet details: local_address=222.222.222.222:67,
remote_address=111.111.111.111:67, msg_type=DHCPNAK (6), transid=0x103ed2fd,
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