New IP address after each reboot
Jean-Philippe Martin
jpmartin at studiohari.com
Tue Apr 26 20:03:04 UTC 2022
Find the problem
reduce "valid-lifetime" is the way
i will use 18000 to much to keep lease data on server
with 8000 it's work fine
mysql bind must have a default time for lfc-interval
i will look code this week
best regards
Le mar. 26 avr. 2022 à 00:21, Jean-Philippe Martin <jpmartin at studiohari.com>
a écrit :
> Hi
>
> We use kea 2.01 (lease and reservation in mysql)
>
> I have exactly this problem :
>
> if i use a subnet with "match-client-id": false
>
> my reservation (identifier is hwaddr) work but other lease is a newer ip at each reboot
>
> If i use a subnet with "match-client-id": true
>
> lease d'ont be reset at boot but reservation don't work any more
>
> best regards
>
>
> _________________________________________
> Hi Anton,
>
> Have you considered dropping the DHCPRELEASE packets instead?
>
> You can read how this could be done in Gitlab #606 "Drop packets in DROP class" at https://gitlab.isc.org/isc-projects/kea/-/issues/606
>
>
> Please refer to the Kea Arm for a discussion on the "DROP" class.
>
>
> Kind Regards Peter
>
>
> ________________________________
> From: Kea-users <kea-users-bounces at lists.isc.org <https://lists.isc.org/mailman/listinfo/kea-users>> on behalf of Anton Starikov <starikov.a at tecomgroup.ru <https://lists.isc.org/mailman/listinfo/kea-users>>
> Sent: 18 October 2020 19:02
> To: kea-users at lists.isc.org <https://lists.isc.org/mailman/listinfo/kea-users> <kea-users at lists.isc.org <https://lists.isc.org/mailman/listinfo/kea-users>>
> Subject: [Kea-users] New IP address after each reboot
>
>
> Good afternoon!
>
> Sorry for my english.
>
>
>
> There is a problem with Kea Dhcp4 1.6.3 (1.8 is the same).
>
> After each reboot, the client (Ubuntu, Arch) gets a new ip address from KeaDhcp. As I understand it, this is due to the fact that Kea, after receiving DHCPRELEASE from the client, does not immediately release the address (although it adds a line with expire = 0 to the lease-database), but does it after a while.
>
> As an experiment, I limited the address pool to two ip. And with each reboot (interval ~ 20 seconds), the client received different addresses in a circle.
>
> Previously, Mikrotik was used as DHCP, there was no such problem. The client rebooted and, if the address was still free, he received it back.
>
> Is there any way to force Kea to immediately release such addresses?
>
>
>
> I tried to change the settings described in the documentation in section "10. Lease Expiration", it didn't help.
>
>
>
>
>
>
>
>
>
> {
>
> "Dhcp4": {
>
> "loggers": [
>
> {
>
> "name": "kea-dhcp4",
>
> "output_options": [
>
> {
>
> "output": "/var/log/kea-debug.log",
>
> "maxver": 8,
>
> "maxsize": 204800,
>
> "flush": true,
>
> "pattern": "%d{%j %H:%M:%S.%q} %c %m\n"
>
> }
>
> ],
>
> "severity": "DEBUG",
>
> "debuglevel": 99
>
> },
>
> {
>
> "name": "kea-dhcp4.commands",
>
> "output_options": [
>
> {
>
> "output": "syslog"
>
> }
>
> ],
>
> "severity": "DEBUG",
>
> "debuglevel": 99
>
> },
>
> {
>
> "name": "kea-dhcp4.http",
>
> "output_options": [
>
> {
>
> "output": "syslog"
>
> }
>
> ],
>
> "severity": "DEBUG",
>
> "debuglevel": 99
>
> },
>
> {
>
> "name": "kea-dhcp4.callouts",
>
> "output_options": [
>
> {
>
> "output": "syslog"
>
> }
>
> ],
>
> "severity": "DEBUG",
>
> "debuglevel": 99
>
> }],
>
> "authoritative": false,
>
> "boot-file-name": "",
>
> "calculate-tee-times": true,
>
> "client-classes": [
>
> {
>
> "boot-file-name": "",
>
> "name": "pxe",
>
> "next-server": "10.0.0.12",
>
> "only-if-required": true,
>
> "option-data": [
>
> {
>
> "always-send": false,
>
> "code": 66,
>
> "csv-format": true,
>
> "data": "10.0.0.12",
>
> "name": "tftp-server-name",
>
> "space": "dhcp4"
>
> },
>
> {
>
> "always-send": false,
>
> "code": 67,
>
> "csv-format": true,
>
> "data": "grldr",
>
> "name": "boot-file-name",
>
> "space": "dhcp4"
>
> }
>
> ],
>
> "option-def": [ ],
>
> "server-hostname": "",
>
> "test": "member('ALL')"
>
> },
>
> {
>
> "boot-file-name": "",
>
> "name": "voip",
>
> "next-server": "10.0.0.10",
>
> "only-if-required": true,
>
> "option-data": [
>
> {
>
> "always-send": false,
>
> "code": 66,
>
> "csv-format": true,
>
> "data": "10.0.0.10",
>
> "name": "tftp-server-name",
>
> "space": "dhcp4"
>
> },
>
> {
>
> "always-send": false,
>
> "code": 67,
>
> "csv-format": true,
>
> "data": "grldr1",
>
> "name": "boot-file-name",
>
> "space": "dhcp4"
>
> }
>
> ],
>
> "option-def": [ ],
>
> "server-hostname": "",
>
> "test": "member('ALL')"
>
> }
>
> ],
>
> "control-socket": {
>
> "socket-name": "/tmp/kea-dhcp4-ctrl.sock",
>
> "socket-type": "unix"
>
> },
>
> "decline-probation-period": 86400,
>
> "dhcp-ddns": {
>
> "enable-updates": false,
>
> "generated-prefix": "myhost",
>
> "max-queue-size": 1024,
>
> "ncr-format": "JSON",
>
> "ncr-protocol": "UDP",
>
> "override-client-update": false,
>
> "override-no-update": false,
>
> "qualifying-suffix": "",
>
> "replace-client-name": "never",
>
> "sender-ip": "0.0.0.0",
>
> "sender-port": 0,
>
> "server-ip": "127.0.0.1",
>
> "server-port": 53001
>
> },
>
> "dhcp-queue-control": {
>
> "capacity": 500,
>
> "enable-queue": false,
>
> "queue-type": "kea-ring4"
>
> },
>
> "dhcp4o6-port": 0,
>
> "echo-client-id": true,
>
> "expired-leases-processing": {
>
> "flush-reclaimed-timer-wait-time": 5,
>
> "hold-reclaimed-time": 1800,
>
> "max-reclaim-leases": 100,
>
> "max-reclaim-time": 250,
>
> "reclaim-timer-wait-time": 10,
>
> "unwarned-reclaim-cycles": 5
>
> },
>
> "hooks-libraries": [
>
> {
>
> "library": "/usr/lib/x86_64-linux-gnu/kea/hooks/libdhcp_lease_cmds.so"
>
> }
>
> ],
>
> "host-reservation-identifiers": [ "hw-address"],
>
> "interfaces-config": {
>
> "interfaces": [ "*" ],
>
> "re-detect": true
>
> },
>
> "lease-database": {
>
> "name": "/var/lib/kea/dhcp4.leases",
>
> "persist": true,
>
> "type": "memfile"
>
> },
>
> "match-client-id": false,
>
> "next-server": "0.0.0.0",
>
> "option-data": [
>
> {
>
> "always-send": false,
>
> "code": 6,
>
> "csv-format": true,
>
> "data": "10.0.0.1",
>
> "name": "domain-name-servers",
>
> "space": "dhcp4"
>
> },
>
> {
>
> "always-send": false,
>
> "code": 15,
>
> "csv-format": true,
>
> "data": "lab.winitlab.com",
>
> "name": "domain-name",
>
> "space": "dhcp4"
>
> },
>
> {
>
> "always-send": false,
>
> "code": 119,
>
> "csv-format": false,
>
> "data": "057465636F6D046E6E6F76027275000A7465636F6D67726F757002727500",
>
> "name": "domain-search",
>
> "space": "dhcp4"
>
> }
>
> ],
>
> "option-def": [ ],
>
> "t1-percent": 0.5,
>
> "t2-percent": 0.875,
>
> "reservation-mode": "all",
>
> "sanity-checks": {
>
> "lease-checks": "warn"
>
> },
>
> "server-hostname": "",
>
> "server-tag": "",
>
> "shared-networks": [ ],
>
> "subnet4": [
>
> {
>
> "4o6-interface": "",
>
> "4o6-interface-id": "",
>
> "4o6-subnet": "",
>
> "authoritative": false,
>
> "calculate-tee-times": true,
>
> "id": 18,
>
> "match-client-id": false,
>
> "next-server": "1.1.1.1",
>
> "option-data": [
>
> {
>
> "always-send": false,
>
> "code": 3,
>
> "csv-format": true,
>
> "data": "10.0.50.1",
>
> "name": "routers",
>
> "space": "dhcp4"
>
> },
>
> {
>
> "always-send": false,
>
> "code": 6,
>
> "csv-format": true,
>
> "data": "10.200.0.1",
>
> "name": "domain-name-servers",
>
> "space": "dhcp4"
>
> },
>
> {
>
> "always-send": false,
>
> "code": 15,
>
> "csv-format": true,
>
> "data": "bncvbn.nnn",
>
> "name": "domain-name",
>
> "space": "dhcp4"
>
> }
>
> ],
>
> "pools": [
>
> {
>
> "option-data": [ ],
>
> "pool": "10.0.50.10-10.0.50.80"
>
> }
>
> ],
>
> "relay": {
>
> "ip-addresses": [ "10.0.50.1" ]
>
> },
>
> "reservation-mode": "all",
>
> "reservations": [],
>
> "subnet": "10.0.50.0/24",
>
> "t1-percent": 0.5,
>
> "t2-percent": 0.875,
>
> "valid-lifetime": 86400
>
> }
>
> ],
>
> "t1-percent": 0.5,
>
> "t2-percent": 0.875,
>
> "valid-lifetime": 4000
>
> }
>
> }
>
>
>
> --
> _______________________
>
--
_______________________
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