[Kea-users] Kea Server Docker on Windows Host doesn't lease to private LAN network

[Payyappattu Raghuram]

Hi All -  In my specific scenario, the Kea Server is running on Docker Desktop (WSL) on Windows 11 Pro with the following setup. The Raspberry Pi is directly connected to the “Ethernet” port via a LAN cable on the Windows host machine and is supposed to receive a DHCP offer from the Kea Server. Wireshark shows that the “Ethernet” interface received the DHCP Request when the Raspberry Pi was plugged in, but somehow the Kea Server couldn't pick up this request. Interestingly, when I run the udhcpc client on the Windows host machine using Docker with the command docker run --net kea-10-ipvlan --rm busybox sh -c "udhcpc -i eth0 -v", the Kea Server successfully leases the IP. The windows firewall is turned off . It would be great if you could share any workarounds for this issue
Here is the logs from Kea Server. Unfortunately, the Raspberry is not getting the DHCP Offer. WhereAny have insight on this ?

kea4-1  | 2024-07-03 21:51:52.593 INFO  [kea-dhcp4.dhcp4/8.140404823505720] DHCP4_QUERY_LABEL received query: [hwtype=1 e4:5f:01:fb:9a:93], cid=[01:e4:5f:01:fb:9a:93], tid=0x7c276e99
kea4-1  | 2024-07-03 21:51:52.593 INFO  [kea-dhcp4.packets/8.140404823505720] DHCP4_PACKET_RECEIVED [hwtype=1 e4:5f:01:fb:9a:93], cid=[01:e4:5f:01:fb:9a:93], tid=0x7c276e99: DHCPDISCOVER (type 1) received from 10.0.0.1 to 10.0.0.2 on interface eth0
kea4-1  | 2024-07-03 21:51:52.593 INFO  [kea-dhcp4.leases/8.140404823505720] DHCP4_LEASE_OFFER [hwtype=1 e4:5f:01:fb:9a:93], cid=[01:e4:5f:01:fb:9a:93], tid=0x7c276e99: lease 10.0.0.30 will be offered
kea4-1  | 2024-07-03 21:51:52.593 INFO  [kea-dhcp4.packets/8.140404823505720] DHCP4_PACKET_SEND [hwtype=1 e4:5f:01:fb:9a:93], cid=[01:e4:5f:01:fb:9a:93], tid=0x7c276e99: trying to send packet DHCPOFFER (type 2) from 10.0.0.2:67 to 10.0.0.30:68 on interface eth0

[cid:image001.png at 01DACD6A.41758820]


Docker Compose file :-
  kea4:
    image: docker.cloudsmith.io/isc/docker/kea-dhcp4:2.6.0<https://urldefense.proofpoint.com/v2/url?u=http-3A__docker.cloudsmith.io_isc_docker_kea-2Ddhcp4-3A2.5.2&d=DwMFaQ&c=oDwORbqiAyI2S1E4GXNhG8NHIJckvCGWArFTLM6Zp04&r=54rkX7RWSzO6WcEMXkTB1jsfzuN_Jjp1LCmGpB1MQ-eKAUbHTHFpwAdrDqyktTEx&m=MufEfpqY7wWn5DmupvLv2xMGsJuVA2znh-BwVr9usTHJB8RIJOchWeGvlV6ubFiq&s=tb1bRDk0XZMaG9TIdN3DAMX197f3FOdznwZWadTxwxY&e=>
    restart: always
    ports:
      - "67:67/udp"
    networks:
      kea-10-ipvlan: # network that binds container to host network interface.
        ipv4_address: 10.0.0.2 # ip for kea4 server
    volumes:
      - type: bind
        source: ./config/kea # configuration files
        target: /etc/kea
      - kea4-var:/var/lib/kea
      - ./kea-data:/tmp   # New volume mapping for kea-leases4.csv
 networks:
  kea-10-ipvlan: # network that binds container to host network interface.
    name: kea-10-ipvlan
    driver: bridge
    driver_opts:
      parent: "Ethernet" #  host interface that kea containers will use
    ipam:
      config:
        - subnet: 10.0.0.0/24<https://urldefense.proofpoint.com/v2/url?u=http-3A__10.0.0.0_24&d=DwMFaQ&c=oDwORbqiAyI2S1E4GXNhG8NHIJckvCGWArFTLM6Zp04&r=54rkX7RWSzO6WcEMXkTB1jsfzuN_Jjp1LCmGpB1MQ-eKAUbHTHFpwAdrDqyktTEx&m=MufEfpqY7wWn5DmupvLv2xMGsJuVA2znh-BwVr9usTHJB8RIJOchWeGvlV6ubFiq&s=G3H9AFxJHYCJrFYUHPI0D4nSPr6jhcd_ZVQF_Tj_aYk&e=>
          gateway: 10.0.0.1

Kea Configuration -
{
  "Dhcp4": {
    "interfaces-config": {
      "interfaces": ["eth0"] // Update this to change Network interface
    },
    "lease-database": {
        "type": "memfile",
        "persist": true,
        "name": "/tmp/kea-leases4.csv",
        "lfc-interval": 1800,  // Update this to change the period to flush out DHCP server file which keeps track of IPs offered
        "max-row-errors": 100
    },
    "subnet4": [
      {
        "subnet": "10.0.0.0/24<https://urldefense.proofpoint.com/v2/url?u=http-3A__10.0.0.0_24&d=DwMFaQ&c=oDwORbqiAyI2S1E4GXNhG8NHIJckvCGWArFTLM6Zp04&r=54rkX7RWSzO6WcEMXkTB1jsfzuN_Jjp1LCmGpB1MQ-eKAUbHTHFpwAdrDqyktTEx&m=MufEfpqY7wWn5DmupvLv2xMGsJuVA2znh-BwVr9usTHJB8RIJOchWeGvlV6ubFiq&s=G3H9AFxJHYCJrFYUHPI0D4nSPr6jhcd_ZVQF_Tj_aYk&e=>", // Alter this to change the range of IPs offering from DHCP server
        "pools": [
          {
            "pool": "10.0.0.3 - 10.0.0.100"  // Alter this to change the pool of IPs offering from DHCP server
          }
        ],
        "interface": "eth0",      // Update this to change Network interface
        "valid-lifetime": 86400,  // Lease time in seconds (86400 seconds = 24 hours)
        "renew-timer": 600,
        "rebind-timer": 900,
        "option-data": [
          {
            "name": "routers",
            "data": "10.0.0.1"
          },
          {
            "name": "domain-name-servers",
            "data": "X.X.X.X"
          }
        ]
      }
    ]
  }
}
Thanks in advance for your help!.
--Raghu
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