[Kea-users] Invalid DHCP Server Identifier: 0.0.0.0

[Adam Twardowski]

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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