[Kea-users] dhcp server as helper server

[Marcin Romanowski]

Hello,
I try to run kea as helper dhcp server. this server will be handled few
different networks but requests will be coming from other network.

this is my config:
{ "Dhcp4":
{
    "interfaces-config": {
        "interfaces": [ "ens4" ],
        "dhcp-socket-type": "udp",
        "outbound-interface": "use-routing",
        "re-detect": true
    },

    "sanity-checks": {
        "lease-checks": "fix-del"
    },
    "lease-database": {
        "type": "memfile",
        "lfc-interval": 3600
    },
    "control-socket": {
        "socket-type": "unix",
        "socket-name": "/tmp/kea4-ctrl-socket"
    },
    "valid-lifetime": 4000,
    "renew-timer": 1000,
    "rebind-timer": 2000,
    "echo-client-id": false,
    "match-client-id": false,
    "authoritative": false,

    "subnet4": [
        {
            "pools": [ { "pool": "192.168.49.2 - 192.168.49.120" } ],
            "subnet": "192.168.49.0/25",
     "option-data": [
        {
            "name": "routers",
            "data": "192.168.49.1"
        }
   ],
   "reservations": [
                    {
                        "hw-address": "0C:F4:65:FE:0A:00",
                        "ip-address": "192.168.49.60"
                    }
                ]
        }
    ],

    "loggers": [
          {
            "name": "kea-dhcp4",
              "output_options": [
                  {
                      "output": "/opt/kea/var/log/kea-dhcp4.log",
                      "pattern": "%d{%y.%m.%d %H:%M:%S.%q} %-5p [%c/%i]
%m\n"
                  }
              ],
              "severity": "INFO"
          }
      ]
  }

}

when proxy server sends to it DHCPREQUEST :
20.05.30 17:15:24.327 INFO  [kea-dhcp4.hosts/14898]
HOSTS_BACKENDS_REGISTERED the following host backend types are available:
postgresql
20.05.30 17:15:24.332 INFO  [kea-dhcp4.dhcpsrv/14898]
DHCPSRV_CFGMGR_SOCKET_TYPE_SELECT using socket type udp
20.05.30 17:15:24.332 INFO  [kea-dhcp4.dhcpsrv/14898]
DHCPSRV_CFGMGR_ADD_IFACE listening on interface ens4
20.05.30 17:15:24.332 INFO  [kea-dhcp4.dhcpsrv/14898]
DHCPSRV_CFGMGR_NEW_SUBNET4 a new subnet has been added to configuration:
192.168.49.0/25 with params: t1=1000, t2=2000, valid-lifetime=4000
20.05.30 17:15:24.332 INFO  [kea-dhcp4.commands/14898]
COMMAND_ACCEPTOR_START Starting to accept connections via unix domain
socket bound to /tmp/kea4-ctrl-socket
20.05.30 17:15:24.333 INFO  [kea-dhcp4.dhcp4/14898] DHCP4_CONFIG_COMPLETE
DHCPv4 server has completed configuration: added IPv4 subnets: 1; DDNS:
disabled
20.05.30 17:15:24.333 INFO  [kea-dhcp4.dhcpsrv/14898] DHCPSRV_MEMFILE_DB
opening memory file lease database: lfc-interval=3600 type=memfile
universe=4
20.05.30 17:15:24.333 INFO  [kea-dhcp4.dhcpsrv/14898]
DHCPSRV_MEMFILE_LEASE_FILE_LOAD loading leases from file
/opt/kea/var/lib/kea/kea-leases4.csv
20.05.30 17:15:24.333 INFO  [kea-dhcp4.dhcpsrv/14898]
DHCPSRV_MEMFILE_LFC_SETUP setting up the Lease File Cleanup interval to
3600 sec
20.05.30 17:15:24.333 WARN  [kea-dhcp4.dhcp4/14898]
DHCP4_MULTI_THREADING_INFO enabled: no, number of threads: 0, queue size: 0
20.05.30 17:15:24.333 INFO  [kea-dhcp4.dhcp4/14898] DHCP4_STARTED Kea
DHCPv4 server version 1.7.8-git started
20.05.30 17:15:45.803 ERROR [kea-dhcp4.bad-packets/14898]
DHCP4_PACKET_NAK_0001 [hwtype=1 0c:f4:65:fe:0a:00], cid=[no info],
tid=0xd209bb6a: *failed to select a subnet for incoming packet, src
10.249.1.202*, type DHCPDISCOVER
20.05.30 17:15:46.805 ERROR [kea-dhcp4.bad-packets/14898]
DHCP4_PACKET_NAK_0001 [hwtype=1 0c:f4:65:fe:0a:00], cid=[no info],
tid=0xd209bb6a: failed to select a subnet for incoming packet, src
10.249.1.202, type DHCPDISCOVER


kea-server is connected to network with address 10.249.2.203 and to this
address all requests will be sending.

How to configure it properly?

Best Regards
Marcin
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