[Kea-users] Kea DHCPv6 not working for a relayed subnet, but fine for local subnet

Mon Oct 22 18:43:29 UTC 2018

Yep, that worked!

Thanks for pointing that out.

Best wishes,

ChrisSW

From: Joelson Vendramin <jtvendramin at yahoo.com.br> 
Sent: 22 October 2018 19:13
To: chris at slater-walker.net; kea-users at lists.isc.org
Subject: Re: [Kea-users] Kea DHCPv6 not working for a relayed subnet, but fine for local subnet

Hello,

I think that in case of relay, you need to specify the global IPv6 address in DHCPv6 configuration, like this:

        "interfaces": [ "em1", "em1/2001:db8::1" ]

See this documentation:

https://kea.isc.org/docs/kea-guide.html#dhcp6-unicast

Regards,

--

Joelson Vendramin

  _____  

De: "chris at slater-walker.net <mailto:chris at slater-walker.net> " <chris at slater-walker.net <mailto:chris at slater-walker.net> >
Para: kea-users at lists.isc.org <mailto:kea-users at lists.isc.org>  
Enviadas: Segunda-feira, 22 de Outubro de 2018 14:45
Assunto: [Kea-users] Kea DHCPv6 not working for a relayed subnet, but fine for local subnet

Hi all

This has stumped me.

I’m using Kea 1.1.0 on Ubuntu 18.04 for IPv6 only. The v4 server is not installed.

It is serving addresses for the local subnet with no problem. I have a guest wireless network connected to an interface on my Cisco 1941 router. This router has a dhcpv6 relay destination of my Kea server.

Tcpdump on the server shows that the server is receiving relayed DHCP requests from clients on the guest network, and the packets contain a link address which is valid in the subnet definition in the Kea config; however the server is not responding in any fashion to these requests. It’s as if they were not there at all.

I have tried the “relay” IPv6 address option in the relevant subnet definition, even though it shouldn’t be necessary, but it makes no difference.

I’m sure this worked for a while but now I just can’t make it work.

Here is my config:

{

  "Dhcp6":

  {

    "interfaces-config":

    {

      "interfaces": [ "em1" ]

    },

    "lease-database":

    {

      "type": "memfile",

      "persist": true,

      "name": "/var/kea/dhcp6.leases"

    },

    "expired-leases-processing":

    {

      "reclaim-timer-wait-time": 10,

      "flush-reclaimed-timer-wait-time": 25,

      "hold-reclaimed-time": 3600,

      "max-reclaim-leases": 100,

      "max-reclaim-time": 250,

      "unwarned-reclaim-cycles": 5

    },

    "preferred-lifetime": 3000,

   "valid-lifetime": 4000,

    "renew-timer": 1000,

    "rebind-timer": 2000,

    "subnet6":

    [

      {

        "subnet": "2xxx:8010:631f:2::/64",

        "interface": "em1",

        "id": 2,

        "option-data":

        [

          {

            "name": "dns-servers",

            "data": "2xxx:8010:631f:2::fd"

          },

          {

            "name": "domain-search",

            "data": "my-domain.net"

          }

        ],

        "pools": [ { "pool": "2xxx:8010:631f:2::101-2xxx:8010:631f:2::1ff" } ],

        "reservations":

        [

          {

            "duid": "00:01:00:01:1e:b7:90:35:f0:de:f1:00:93:b9",

            "ip-addresses": [ "2xxx:8010:631f:2::b" ],

            "hostname": "xxx-laptop1"

          },

          {

            "duid": "00:01:00:01:20:54:28:1d:00:24:d7:68:ff:bc",

            "ip-addresses": [ "2xxx:8010:631f:2::4" ],

            "hostname": "xxx-laptop2"

          },

          {

            "duid": "00:01:00:01:19:d5:b0:63:10:0b:a9:e5:72:04",

            "ip-addresses": [ "2xxx:8010:631f:2::7" ],

            "hostname": "yyy-laptop2"

          },

          {

            "duid": "00:01:00:01:20:bd:bc:af:40:8d:5c:17:95:31",

            "ip-addresses": [ "2xxx:8010:631f:2::13" ],

            "hostname": "xxx-desktop"

          },

          {

            "duid": "00:01:00:01:22:2D:F9:D5:D4:25:8B:11:73:99",

            "ip-addresses": [ "2xxx:8010:631f:2::17" ],

            "hostname": "yyy-laptop3"

          },

          {

            "duid": "00:03:00:01:b4:b5:2f:0b:1c:cf",

            "ip-addresses": [ "2xxx:8010:631f:2::fe" ],

            "hostname": "printer"

          }

        ]

      },

      {

        "subnet": "2xxx:8010:631f:64::/64",

        "id": 100,

        "option-data":

        [

          {

            "name": "dns-servers",

            "data": "2606:4700:4700::1111, 2606:4700:4700::1001"

          }

        ],

        "pools": [ { "pool": "2xxx:8010:631f:64::101-2xxx:8010:631f:64::1ff" } ]

      }

    ]

  },

  "Logging":

  {

    "loggers":

    [

      {

        "name": "kea-dhcp6",

        "output_options":

        [

          {

            "output": "/var/log/kea-dhcp6.log"

          }

        ],

        "severity": "DEBUG",

        "debuglevel": 3

      }

    ]

  }

}

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