[Kea-users] Invalid DHCP Server Identifier: 0.0.0.0

[Adam Twardowski]

Yes, that is exactly right.  I also tested with isc-dhcpd and that works 
normally with this setup.



On 08/30/2016 01:05 PM, Todd Simmons (todsimmo) wrote:
> Adam,
>
> When you say you have the router acting as a relay, do you mean you have a
> sub-interface on the router for the subnet and it has the Kea IP as the
> helper address?
>
>
>
> Todd Simmons
> CCIE Wireless #42411
> Network Consulting Engineer
> Advanced Services WWWP - Wireless LAN
> Cisco Systems, Inc.
> todsimmo at cisco.com
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>
> On 8/30/16, 8:42 AM, "Kea-users on behalf of Adam Twardowski"
> <kea-users-bounces at lists.isc.org on behalf of atwardowski at choopa.com>
> wrote:
>
>> I am running kea on FreeBSD.  I have a cisco router configured as a dhcp
>> relay, forwarding requests to Kea.  Kea receives the requests and sends
>> out a reply, but the reply has option 54 set to 0.0.0.0, which as far as
>> I know doesn't make any sense.  The DHCP client can't continue the
>> transaction because it obviously can't send a packet to 0.0.0.0.  Is
>> there any way I can tell kea to send a valid server identifier?
>>
>>
>> Config:
>>
>> {
>> "Dhcp4":
>> {
>>    "interfaces-config": {
>>      "interfaces": [ "em0" ],
>>      "dhcp-socket-type": "udp"
>>    },
>>    "lease-database": {
>>      "type": "memfile",
>>      "lfc-interval": 1800
>>    },
>>    "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
>>    },
>>
>>    "valid-lifetime": 4000,
>>
>>    "subnet4": [
>>    {    "subnet": "10.128.224.0/20",
>>         "pools": [ { "pool": "10.128.239.3 - 10.128.239.254" } ],
>>         "option-data": [
>>              { "name": "routers", "data": "10.128.224.1" },
>>              { "name": "domain-name-servers", "data": "8.8.8.8, 8.8.4.4"
>> },
>>          ]
>>    }
>>    ]
>> },
>>
>>
>>
>> Kea Reply:
>>
>> Bootstrap Protocol (Offer)
>>      Message type: Boot Reply (2)
>>      Hardware type: Ethernet (0x01)
>>      Hardware address length: 6
>>      Hops: 1
>>      Transaction ID: 0xccc20000
>>      Seconds elapsed: 0
>>      Bootp flags: 0x0000 (Unicast)
>>          0... .... .... .... = Broadcast flag: Unicast
>>          .000 0000 0000 0000 = Reserved flags: 0x0000
>>      Client IP address: 0.0.0.0
>>      Your (client) IP address: 10.128.239.4
>>      Next server IP address: 0.0.0.0
>>      Relay agent IP address: 10.128.224.1
>>      Client MAC address: ---------- DELETED -----------
>>      Client hardware address padding: 00000000000000000000
>>      Server host name not given
>>      Boot file name not given
>>      Magic cookie: DHCP
>>      Option: (1) Subnet Mask
>>          Length: 4
>>          Subnet Mask: 255.255.240.0
>>      Option: (3) Router
>>          Length: 4
>>          Router: 10.128.224.1
>>      Option: (6) Domain Name Server
>>          Length: 8
>>          Domain Name Server: 8.8.8.8
>>          Domain Name Server: 8.8.4.4
>>      Option: (51) IP Address Lease Time
>>          Length: 4
>>          IP Address Lease Time: (4000s) 1 hour, 6 minutes, 40 seconds
>>      Option: (53) DHCP Message Type (Offer)
>>          Length: 1
>>          DHCP: Offer (2)
>>      Option: (54) DHCP Server Identifier
>>          Length: 4
>>          DHCP Server Identifier: 0.0.0.0
>>      Option: (255) End
>>          Option End: 255
>>
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