Hi Peter, Thank you very much.
"ddns-replace-client-name": "always" was the solution. Regards, Joop. On Thursday, January 8, 2026 2:47:19 PM Central European Standard Time Peter Davies wrote: > Hi Joop, > What value do you have "ddns-replace-client-name" configured to? > > Sending a DHCPDiscover with no hostname (option 12), I see the hostname > created > by the ddns-tuning hook being sent back to the client and forwarded to > kea-dhcp-ddns. > > Using "ddns-replace-client-name": "always", and the previous > "hostname-expr". > > --- paste--- > msg_type=DHCPACK (5), trans_id=0xa47b2617, secs=0, flags=0x0, > yiaddr=192.168.20.100, giaddr=192.168.20.1, > options: > type=001, len=004: 4294967040 (uint32) > type=003, len=004: 192.168.20.1 > type=012, len=034: "vm-test-192-168-20-100.example.com" (string) > type=051, len=004: 7200 (uint32) > type=053, len=001: 5 (uint8) > type=054, len=004: 192.168.10.1 (ipv4-address) > type=082, len=016:, > options: > type=001, len=014: 76:65:74:68:2d:72:65:6c:61:79:2d:63:6c:69 > 'veth-relay-cli' > ... > 2026-01-08 13:42:54.089 DEBUG [kea-dhcp4.dhcpsrv/143967.139899928512384] > DHCPSRV_DHCP_DDNS_NCR_SENT NameChangeRequest sent to kea-dhcp-ddns: > Type: 0 (CHG_ADD) > Forward Change: yes > Reverse Change: yes > FQDN: [vm-test-192-168-20-100.example.com.] > IP Address: [192.168.20.100] > DHCID: > [000001F868E6B22D81DAFE0535549E8A960F055026EA04BF615B53D5A1CE0479A4CD98] > Lease Expires On: 20260108142254 > Lease Length: 2400 > Conflict Resolution Mode: no-check-with-dhcid > ---/paste--- > > /Peter -- 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. [email protected]
