[Kea-users] DHCPv6 allocations (IA_NA and IA_PD) based on interface-id (relay Option 18) [update: solution provided]

[Joelson Vendramin]

Hello all,

Just to update you that I found a (possible) solution for the configuration I posted yesterday.
Maybe it's not the "best" or most "elegant" solution, but it worked as I expected. Basically I'm using "/128 IPv6 subnets" and the "interface-id" parameter to read option 18 inserted by relay.

The DHCPv6 piece of kea.conf is in the sequence.


Regards,

--
Joelson Vendramin



==================
kea.conf
==================


# DHCPv6 configuration starts here.
"Dhcp6":
{

# Add names of interfaces to listen on.
  "interfaces-config": {
    "interfaces": [ "eth0/2001:db8:bdff::2" ]
  },


# (...) standard options (...)

# subnets (one for each "interface id")
  "subnet6": [
# client that comes from vlan 333
       { "subnet": "2001:db8:bd00::119:2/128",
           "interface-id": "routername eth 0/6:333",
           "pools": [ { "pool": "2001:db8:bd00::119:2/128" } ],
           "pd-pools": [ { "prefix": "2001:db8:bd01::", "prefix-len": 48, "delegated-len": 48 } ]
       },
# client that comes from vlan 334
       { "subnet": "2001:db8:bd00::119:3/128",
           "interface-id": "routername eth 0/6:334",
           "pools": [ { "pool": "2001:db8:bd00::119:3/128" } ],
           "pd-pools": [ { "prefix": "2001:db8:bd02::", "prefix-len": 48, "delegated-len": 48 } ]
       }
  ]
}

# (...) rest of config file (...)


________________________________
De: Joelson Vendramin <jtvendramin at yahoo.com.br>
Para: "kea-users at lists.isc.org" <kea-users at lists.isc.org> 
Enviadas: Quinta-feira, 30 de Março de 2017 16:33
Assunto: DHCPv6 allocations (IA_NA and IA_PD) based on interface-id (relay Option 18)



Hello,



I'm trying to use KEA 1.1.0 to allocate IPv6 addresses (IA_NA) and IPv6 prefixes (IA_PD) based on interface-id -- option 18 inserted by an DHCPv6 relay agent.

I know it's a kind of "reservation", but I'm trying to do it based on DHCPv6 relay option 18 (interface-id) rather than client's DUID or MAC address.


I tryied the following config but it failed to start the server. The problem is that "client-class" is an unsupported parameter inside a "pd-pool" entry. Note that if I remove "pd-pools", the configuration is working fine to allocate fixed IA_NA addresses ("pools" entry).


Any trick to add the same behavior to "pd-pools" in order to assign always the same IA_PD to "cliA" and "cliB" client-classes?


Thank you in advance!

--

Joelson Vendramin



==================

kea.conf

==================



# DHCPv6 configuration starts here.

"Dhcp6":

{


# Add names of interfaces to listen on.

  "interfaces-config": {

    "interfaces": [ "eth0/2001:db8:bdff::2" ]

  },



# (...) standard options (...)


# classes to identify customers

  "client-classes": [

    {  "name": "cliA",

       "test": "substring(relay6[0].option[18].hex,0,all) == 'routername eth 0/6:333'"

    },

    {  "name": "cliB",

       "test": "substring(relay6[0].option[18].hex,0,all) == 'routername eth 0/6:334'"

    }

  ],


# subnets (just one with many pools and pd-pools inside)

  "subnet6": [

     {  "subnet": "2001:db8:bd00::/64",

        "pools": [

           { "pool": "2001:db8:bd00::119:2/128",

             "client-class": "cliA"

           },

           { "pool": "2001:db8:bd00::119:3/128",

             "client-class": "cliB"

           }

        ],

        "pd-pools": [

           { "prefix": "2001:db8:bd01::",

             "prefix-len": 48,

             "delegated-len": 48,

             "client-class": "cliA"

           },

           { "prefix": "2001:db8:bd02::",

             "prefix-len": 48,

             "delegated-len": 48,

             "client-class": "cliB"

           }

        ],

     }

   ]

}


# (...) rest of config file (...)