[kea-dev] Hello & Suggested Documentation Update

[Ray Hunter (v6ops)]

Hi. I'm using the KEA DHCPv6 server for experiments in extending DHCPv6.

Up until now my experience with 0.92 has been really good. Thanks.

I note that you requested updates to the documentation, based on 
deployment experience.

I'm following http://kea.isc.org/docs/kea-guide.html#keactrl-config-file

Section 8.2.1 subnet declaration does not include an explicit 
"interface" definition.

When I build a test config based on the example, the server refused to 
grant leases with a message "failed to select subnet for the client" 
Debug is contained below.

It took me a while to work out what was going wrong.

Adding

"interface": "eth1"

as suggested in the "subnet6" example later in the same section fixed 
the problem.

Humbly suggest you add
"interface": "eth0"
to the first example config

Either that or there's a bug, because the server is only listening on 
one interface [eth1] and the pool is not being auto-added to that interface.

-- 
regards,
RayH

debug below

2015-11-30 01:28:50.845 DEBUG [kea-dhcp6.packets/4242] 
DHCP6_BUFFER_RECEIVED received buffer from fe80::250:56ff:fe20:207d:546 
to ff02::1:2:0 over interface eth1
2015-11-30 01:28:50.884 DEBUG [kea-dhcp6.options/4242] 
DHCP6_BUFFER_UNPACK parsing buffer received from 
fe80::250:56ff:fe20:207d to ff02::1:2 over interface eth1
2015-11-30 01:28:51.058 DEBUG [kea-dhcp6.packets/4242] 
DHCP6_PACKET_RECEIVED duid=[00:03:00:01:00:50:56:20:20:7d], 
tid=0x1e5d72: SOLICIT (type ^A) received from fe80::250:56ff:fe20:207d 
to ff02::1:2 on interface eth1
2015-11-30 01:28:51.071 DEBUG [kea-dhcp6.packets/4242] DHCP6_QUERY_DATA 
duid=[00:03:00:01:00:50:56:20:20:7d], tid=0x1e5d72, packet details: 
localAddr=[ff02::1:2]:0 remoteAddr=[fe80::250:56ff:fe20:207d]:546
msgtype=1, transid=0x1e5d72
type=00001, len=00010: 00:03:00:01:00:50:56:20:20:7d
type=00003(IA_NA), len=00012: iaid=1, t1=0, t2=0
type=00006, len=00026: 21(uint16) 22(uint16) 23(uint16) 24(uint16) 
31(uint16) 56(uint16) 64(uint16) 67(uint16) 82(uint16) 83(uint16) 
94(uint16) 95(uint16) 96(uint16)
type=00008, len=00002: 108 (uint16)
type=00020, len=00000:
type=00025(IA_PD), len=00012: iaid=1, t1=0, t2=0
type=39(CLIENT_FQDN), flags: (N=0, O=0, S=0), domain-name='openwrt.' (full)

2015-11-30 01:28:51.102 DEBUG [kea-dhcp6.packets/4242] 
DHCP6_SUBNET_SELECTION_FAILED duid=[00:03:00:01:00:50:56:20:20:7d], 
tid=0x1e5d72: failed to select subnet for the client
2015-11-30 01:28:51.112 DEBUG [kea-dhcp6.ddns/4242] 
DHCP6_DDNS_RECEIVE_FQDN duid=[00:03:00:01:00:50:56:20:20:7d], 
tid=0x1e5d72: received DHCPv6 Client FQDN option: type=39(CLIENT_FQDN), 
flags: (N=0, O=0, S=0), domain-name='openwrt.' (full)
2015-11-30 01:28:51.115 DEBUG [kea-dhcp6.ddns/4242] 
DHCP6_DDNS_RESPONSE_FQDN_DATA duid=[00:03:00:01:00:50:56:20:20:7d], 
tid=0x1e5d72: including FQDN option in the server's response: 
type=39(CLIENT_FQDN), flags: (N=1, O=0, S=0), domain-name='openwrt.' (full)
2015-11-30 01:28:51.115 DEBUG [kea-dhcp6.leases/4242] 
DHCP6_PROCESS_IA_NA_REQUEST duid=[00:03:00:01:00:50:56:20:20:7d], 
tid=0x1e5d72: server is processing IA_NA option with iaid=1 and hint=(no 
hint)
2015-11-30 01:28:51.115 DEBUG [kea-dhcp6.options/4242] 
DHCP6_ADD_STATUS_CODE_FOR_IA duid=[00:03:00:01:00:50:56:20:20:7d], 
tid=0x1e5d72: adding Status Code to IA with iaid=1: NoAddrsAvail(2) 
"Server could not select subnet for this client"


failing config snippet


"Dhcp6": {

# First we set up global values
     "renew-timer": 1000,
     "rebind-timer": 2000,
     "preferred-lifetime": 3000,
     "valid-lifetime": 4000,

# Next we setup the interfaces to be used by the server.
     "interfaces-config": {
         "interfaces": [ "eth1" ]
     },


# Finally, we list the subnets from which we will be leasing addresses.
     "subnet6": [
         {
             "pools": [
                  {
                      "pool": "2001:47f:1::1-2001:47f:1::ffff"
                  }
              ],
             "subnet": "2001:47f:1::/64"
# uncommenting the following two lines fixes the problem
# "subnet": "2001:47f:1::/64",
#"interface": "eth1"
         }
     ]
# DHCPv6 configuration ends with the next line
}
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