[Kea-users] Dhcpv6 server

[Joshua Schaeffer]

On 3/3/21 7:41 AM, João Butzke wrote:
> First of all, the server(ubuntu 20.04) need to have an ipv6 address on the interface?

Not necessarily. If you do not specify a unicast address in the configuration then kea-dhcp6 will listen on the multicast address for the VLAN that the interface resides on. The DHCPv6 multicast address is: ff02::1:2.

> if yes, the address needs to be in the pool?

Again, not necessarily. If you specify a unicast address that is not in the same subnet as your pool then you have to relay the DHCP requests to the server using DHCP relay.

>
> Here is the server log when started:
>
> naxi at dhcpv6:~/kea6$ 2021-03-02 20:42:09.551 INFO [kea-dhcp6.hosts/6206.139941705381376] HOSTS_BACKENDS_REGISTERED the following host backend types are available: mysql
> 2021-03-02 20:42:09.554 INFO [kea-dhcp6.dhcpsrv/6206.139941705381376] DHCPSRV_CFGMGR_ADD_IFACE listening on interface ens19
> 2021-03-02 20:42:09.555 INFO [kea-dhcp6.dhcpsrv/6206.139941705381376] DHCPSRV_CFGMGR_NEW_SUBNET6 a new subnet has been added to configuration: 2804:15e4:8000::/36 with params: t1=1000, t2=2000, preferred-lifetime=3000, valid-lifetime=4000, rapid-commit is false
> 2021-03-02 20:42:09.556 INFO [kea-dhcp6.commands/6206.139941705381376] COMMAND_ACCEPTOR_START Starting to accept connections via unix domain socket bound to /tmp/kea6-ctrl-socket
> 2021-03-02 20:42:09.557 INFO [kea-dhcp6.dhcp6/6206.139941705381376] DHCP6_CONFIG_COMPLETE DHCPv6 server has completed configuration: added IPv6 subnets: 1; DDNS: disabled
> 2021-03-02 20:42:09.557 INFO [kea-dhcp6.dhcpsrv/6206.139941705381376] DHCPSRV_MYSQL_DB opening MySQL lease database: host=localhost name=kea password=***** port=3306 type=mysql universe=6 user=kea
> 2021-03-02 20:42:09.598 INFO [kea-dhcp6.hosts/6206.139941705381376] DHCPSRV_MYSQL_HOST_DB opening MySQL hosts database: host=localhost name=kea password=***** port=3306 type=mysql universe=6 user=kea
> 2021-03-02 20:42:09.651 INFO [kea-dhcp6.dhcp6/6206.139941705381376] DHCP6_USING_SERVERID server is using server-id 00:01:00:01:27:cf:ff:37:16:41:55:fb:6b:16 and stores in the file /usr/local/var/lib/kea/kea-dhcp6-serverid
> 2021-03-02 20:42:09.655 WARN [kea-dhcp6.dhcp6/6206.139941705381376] DHCP6_MULTI_THREADING_INFO enabled: no, number of threads: 0, queue size: 0
> 2021-03-02 20:42:09.655 INFO [kea-dhcp6.dhcp6/6206.139941705381376] DHCP6_STARTED Kea DHCPv6 server version 1.8.2 started
>
> There is no errors, but when i run a tcdump, there is no answered dhcp requests..

I noticed you are configuring a /36. Do you have prefix delegation configured? You should provide your configuration. Also your log only shows up to kea starting. Are you getting any log entries when a client performs a SOLICIT? If not then your SOLICIT is not even getting to the server in the first place (or is being blocked by a firewall).

-- 
Thanks,
Joshua Schaeffer

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