[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