Hi Rainer, I do not know what is going on with that particular version of Windows 11, but you can mitigate the effects on Kea / DNS by making two changes:
- Enable lease caching (https://kea.readthedocs.io/en/kea-2.6.1/arm/dhcp4-srv.html#lease-caching) - Disable "ddns-update-on-renew" (https://kea.readthedocs.io/en/kea-2.6.1/arm/dhcp4-srv.html#ddns-for-dhcpv4) Thank you, Darren Ankney On Fri, Jan 24, 2025 at 4:43 PM <r...@bluemail.ch> wrote: > > Hi, > > I am facing a quite strange issue with Windows 11 24H2 clients and Kea > DHCPv6. > > Windows seems to constantly request a new lease. This is flooding the > logs and also putting load on DNS when I keep dynamic DNS enabled. There > are multiple DHCP6_LEASE_RENEW per second logged. > > I did neither observe this from Linux clients nor from Windows clients > other than Windows 11 24H2. > > Unfortunately I was unsuccessful tracking down this issue to a > configuration problem. Windows 11 clients were re-installed multiple > times. I also checked my kea configuration and looked for eventually > missing parameters which could make Windows DHCP client fail and retry > but was unsuccessful doing so. > > Also I tried disabling DDNS but this only reducing the log spam and load > on DNS slightly, but does not change anything about the request flood. > > I also tried different renew-timer/rebind-timer and lifetime parameters. > None of them prevent Windows to re-send multiple RENEW requests per second. > > Here is my kea config: > > { > "Dhcp6": { > "interfaces-config": { > "interfaces": [ "lan", "brkvm" ] > }, > > "multi-threading": { > "enable-multi-threading": true > }, > > "dhcp-ddns": { > "enable-updates": true, > "server-ip": "127.0.0.1", > "server-port": 53001, > "sender-ip": "", > "sender-port": 0, > "max-queue-size": 1024, > "ncr-protocol": "UDP", > "ncr-format": "JSON" > }, > "ddns-send-updates": true, > "ddns-override-client-update": false, > "ddns-override-no-update": true, > "ddns-replace-client-name": "when-not-present", > "ddns-generated-prefix": "client", > "ddns-qualifying-suffix": "roelli.intranet", > "ddns-update-on-renew": true, > "ddns-use-conflict-resolution": false, > > "control-socket": { > "socket-type": "unix", > "socket-name": "/run/kea/kea6-ctrl-socket" > }, > > "lease-database": { > "type": "memfile" > }, > > "preferred-lifetime": 604800, > "valid-lifetime": 2592000, > > "option-data": [ > { > "name": "dns-servers", > "data": "fddb:9f42:7afb:1::1, fddb:9f42:7afb:1::2" > }, > { > "name": "client-fqdn", > "data": "0, domain.intranet" > }, > > { > "name": "domain-search", > "data": "domain.local, domain.intranet" > } > ], > > "subnet6": [ > { > "subnet": "fddb:9f42:7afb:1::/64", > "interface": "lan", > "rapid-commit": true, > "pools": [ { "pool": "fddb:9f42:7afb:1::10 - > fddb:9f42:7afb:1::ff" } ] > } > ], > > "loggers": [ > { > "name": "kea-dhcp6", > "output_options": [ > { > "output": "syslog:kea-dhcp6" > } > ], > "debuglevel": 0 > } > ] > } > } > > > > > Log examples: > Jan 24 18:23:05 master kea-dhcp6[14789]: INFO > [kea-dhcp6.leases.139652654696128] DHCP6_LEASE_RENEW > duid=[00:01:00:01:2e:a1:6e:10:d0:ad:08:30:3f:97], tid=0x4e84ac: lease > for address fddb:9f42:7afb:1::27 and iaid=181447944 has been allocated > Jan 24 18:23:05 master kea-dhcp6[14789]: INFO > [kea-dhcp6.leases.139652612753088] DHCP6_LEASE_RENEW > duid=[00:01:00:01:2e:a1:6e:10:d0:ad:08:30:3f:97], tid=0xf02aae: lease > for address fddb:9f42:7afb:1::27 and iaid=181447944 has been allocated > Jan 24 18:23:06 master kea-dhcp6[14789]: INFO > [kea-dhcp6.leases.139652507895488] DHCP6_LEASE_RENEW > duid=[00:01:00:01:2e:a1:6e:10:d0:ad:08:30:3f:97], tid=0x125d1b: lease > for address fddb:9f42:7afb:1::27 and iaid=181447944 has been allocated > Jan 24 18:23:06 master kea-dhcp6[14789]: INFO > [kea-dhcp6.leases.139652591781568] DHCP6_LEASE_RENEW > duid=[00:01:00:01:2e:a1:6e:10:d0:ad:08:30:3f:97], tid=0xb792e3: lease > for address fddb:9f42:7afb:1::27 and iaid=181447944 has been allocated > Jan 24 18:23:07 master kea-dhcp6[14789]: INFO > [kea-dhcp6.leases.139652518381248] DHCP6_LEASE_RENEW > duid=[00:01:00:01:2e:a1:6e:10:d0:ad:08:30:3f:97], tid=0x6b4126: lease > for address fddb:9f42:7afb:1::27 and iaid=181447944 has been allocated > Jan 24 18:23:07 master kea-dhcp6[14789]: INFO > [kea-dhcp6.leases.139652539352768] DHCP6_LEASE_RENEW > duid=[00:01:00:01:2e:a1:6e:10:d0:ad:08:30:3f:97], tid=0x81b226: lease > for address fddb:9f42:7afb:1::27 and iaid=181447944 has been allocated > Jan 24 18:23:08 master kea-dhcp6[14789]: INFO > [kea-dhcp6.leases.139652570810048] DHCP6_LEASE_RENEW > duid=[00:01:00:01:2e:a1:6e:10:d0:ad:08:30:3f:97], tid=0x1eb04c: lease > for address fddb:9f42:7afb:1::27 and iaid=181447944 has been allocated > Jan 24 18:23:08 master kea-dhcp6[14789]: INFO > [kea-dhcp6.leases.139652633724608] DHCP6_LEASE_RENEW > duid=[00:01:00:01:2e:a1:6e:10:d0:ad:08:30:3f:97], tid=0xa550db: lease > for address fddb:9f42:7afb:1::27 and iaid=181447944 has been allocated > Jan 24 18:23:09 master kea-dhcp6[14789]: INFO > [kea-dhcp6.leases.139652549838528] DHCP6_LEASE_RENEW > duid=[00:01:00:01:2e:a1:6e:10:d0:ad:08:30:3f:97], tid=0x5801f4: lease > for address fddb:9f42:7afb:1::27 and iaid=181447944 has been allocated > ... > > > My current version is 2.4.1. > > > Any ideas? Or did anybody experience similar issues before? > > > best regards, > Rainer > -- > ISC funds the development of this software with paid support subscriptions. > Contact us at https://www.isc.org/contact/ for more information. > > To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users. > > Kea-users mailing list > Kea-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/kea-users -- ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users. Kea-users mailing list Kea-users@lists.isc.org https://lists.isc.org/mailman/listinfo/kea-users
