[Kea-users] Kea 1.6 DHCP6 configuration on Raspberry Pi 3b running Ubuntu 20.04

[Gibbins, John (IM&T, Black Mountain)]

Hi Russell,

Is this a problem?  Our systems running with the old ISC DHCP server report /128 on Ubuntu boxes for addresses handed out by DHCPv6 even though link local addresses appear as /64.
In a sense all host addresses are /128 entries.  The important thing is that the routing table includes a route for the /64 block containing the address.  As long as that is there your system should work properly.  That should be learnt from the RA rather than DHCP.

Regards
johng

From: Kea-users <kea-users-bounces at lists.isc.org> On Behalf Of russell aspinwall
Sent: Tuesday, 2 March 2021 7:32 AM
To: Torbjörn Eklöv <torbjorn.eklov at interlan.se>; kea-users at lists.isc.org; russell.aspinwall at bcs.org.uk
Subject: Re: [Kea-users] Kea 1.6 DHCP6 configuration on Raspberry Pi 3b running Ubuntu 20.04

Hi

Thanks for the feedback, my router is pfsense firewall and I haveconfigured the LAN side Router Advertisements as
Managed -RA Flags [managed. other stateful], Prefix flags [onlink, router]  but the dhcp6 client get a ::/128 address
I have also configured the correct RA subnet for the interface but while the clients get an IPv6 address from the pool, the subnet is still wrong.

Thanks

Russell



On 01/03/2021 16:30, Torbjörn Eklöv wrote:
DHCPv6 only gives you an address, RA is the one who gives you the infrastructure.




/Torbjörn Eklöv
Interlan Gefle AB
mobil: 070 - 683 51 75
http://test-ipv6.se

A home without IPv6 is just a house
________________________________
Från: Kea-users <kea-users-bounces at lists.isc.org><mailto:kea-users-bounces at lists.isc.org> för russell aspinwall <raspinwall at willows7.myzen.co.uk><mailto:raspinwall at willows7.myzen.co.uk>
Skickat: den 1 mars 2021 17:23
Till: kea-users at lists.isc.org<mailto:kea-users at lists.isc.org> <kea-users at lists.isc.org><mailto:kea-users at lists.isc.org>
Ämne: [Kea-users] Kea 1.6 DHCP6 configuration on Raspberry Pi 3b running Ubuntu 20.04

Hi,

I have successfully configured HA between two Raspberry Pi 3bs running
Ubuntu server 20.04 with repository Kea 1.6 version.

I have configured a DHCP6 range and a pool but the client always has a
::/128 address.

As I have a mixture of staticly assigned  and dhcp6 clients in the same
::/64 subnet, I have specified my ::/64 subnet in the

{
           "id": 2012,
           "pools": [ { "pool": "NNNN:PPPP:QQQQ:T:ffff::/80" } ],
           "subnet": "NNNN:PPPP:QQQQ:T::/64",
           "interface": "eth0",
          "option-data" : [
              {
                 "name": "domain-search",
                 "csv-format": true,
                 "data": "euclid.plato"
              },
              {
                 "name": "dns-servers",
                 "data": "NNNN:PPPP:QQQQ:T:8213:1132:6645:2222"
              },
              {
                 "name": "sntp-servers",
                 "data": "NNNN:PPPP:QQQQ:T:8213:1132:6645:2222"
              }

       ]

}

How I can I assign a ::/64 address which is selected from only a smaller
portion of the ::/64 subnet so that the client is assigned a ::/64 address.

Thanks

Russell

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