<div>Hello,</div><br><div>I am trying to configure stateless DHCPv6 with reference to the documentation[1].</div><br><div>When set, "Sorry, no prefixes could be allocated." Is output, and a message indicating that allocation is not possible is output.</div><br><div>Logs: >>></div><div>2019-08-26 20:40:39.270 DEBUG [kea-dhcp6.packets/35] DHCP6_SUBNET_SELECTED duid=[00:03:00:01:6c:3b:6b:cf:9b:94], tid=0xcab890: the subnet with ID 1024 was selected for client assignments
</div><div>2019-08-26 20:40:39.270 DEBUG [kea-dhcp6.packets/35] DHCP6_SUBNET_DATA duid=[00:03:00:01:6c:3b:6b:cf:9b:94], tid=0xcab890: the selected subnet details: 240b:11:8500:5710::/64
</div><div>2019-08-26 20:40:39.271 DEBUG [kea-dhcp6.packets/35] DHCP6_PACKET_SEND duid=[00:03:00:01:6c:3b:6b:cf:9b:94], tid=0xcab890: trying to send packet ADVERTISE (type 2) from [ff02::1:2]:547 to [fe80::8e3b:6bff:fecf:9b94]:546 on interface eth0
</div><div>2019-08-26 20:40:39.272 DEBUG [kea-dhcp6.packets/35] DHCP6_RESPONSE_DATA responding with packet type 2 data is localAddr=[ff02::1:2]:547 remoteAddr=[fe80::8e3b:6bff:fecf:9b94]:546
</div><div>msgtype=2(ADVERTISE), transid=0xcab890
</div><div>type=00001, len=00010: 00:03:00:01:6c:3b:6b:cf:9b:94
</div><div>type=00002, len=00014: 00:01:00:01:24:f6:67:37:1a:c0:c9:ca:a9:5e
</div><div>type=00023, len=00080: <DNS server IP address></div><div>type=00025(IA_PD), len=00056: iaid=6, t1=0, t2=0,
</div><div>options:
</div><div>  type=00013, len=00040: NoPrefixAvail(6) "Sorry, no prefixes could be allocated."
</div><div>No relays traversed.
</div><br><div>2019-08-26 20:40:39.271 WARN  [kea-dhcp6.alloc-engine/35] ALLOC_ENGINE_V6_ALLOC_FAIL duid=[00:03:00:01:6c:3b:6b:cf:9b:94], tid=0xcab890: failed to allocate an IPv6 address after 0 attempt(s)</div><br><div><<<</div><br><div>config: >>></div><div>{
</div><div> "Dhcp6": {
</div><div>         
</div><div>     "valid-lifetime": 86400,
</div><div>     "renew-timer": 3600,
</div><div>     "rebind-timer": 7200,
</div><div>     "preferred-lifetime": 54000,
</div><div>     "decline-probation-period": 3600,
</div><div>         "mac-sources": [ "client-link-addr-option" ],
</div><div>     "interfaces-config": {
</div><div>         "interfaces": ["eth0"]      
</div><div>     },                                                                                                                               
</div><div>     "control-socket": {
</div><div>         "socket-type": "unix",
</div><div>         "socket-name": "/tmp/kea-dhcp6-ctrl.sock"
</div><div>     },                   
</div><div>     "lease-database": {
</div><div>         "type": "memfile",
</div><div>         "persist": true,
</div><div>         "name": "/var/lib/kea/dhcp6.leases"
</div><div>     },    
</div><div>     "option-data": [
</div><div>         {
</div><div>             "name": "dns-servers",
</div><div>             "data": "<DNS SERVERS IP ADDRESS>"       
</div><div>         },
</div><div>         {
</div><div>             "name": "domain-search",
</div><div>             "data": "example.com"
</div><div>         },
</div><div>         {
</div><div>             "name": "sntp-servers",
</div><div>             "data": "<NTP SERVERS>"
</div><div>         },
</div><div>         {
</div><div>             "name": "new-tzdb-timezone",
</div><div>             "data": "JP"
</div><div>         }
</div><div>     ],
</div><div>         
</div><div>     "subnet6": [
</div><div>         {
</div><div>             "subnet":<span data-emoji-typing="true"> "</span><IPv6 network address assigned by ISP>/64",
</div><div>             "interface": "eth0",
</div><div>         }
</div><div>     ]
</div><div> }
</div><div>}</div><br><div>With statefull DHCPv6, it was possible to assign addresses to client PCs.</div><div>Is there something wrong with the settings?</div><br><div>Best regards.</div><br><div>[1] <a href="https://downloads.isc.org/isc/kea/1.6.0-beta2/doc/kea-guide.html#stateless-dhcp6" title="https://downloads.isc.org/isc/kea/1.6.0-beta2/doc/kea-guide.html#stateless-dhcp6">https://downloads.isc.org/isc/kea/1.6.0-beta2/doc/kea-guide.html#stateless-dhcp6</a></div>