[Kea-users] Ghost Leases - No client id or hardware address

[Allan Tinker]

Update:

Im using the Circuit_ID as the client_id with the Flex Hook, 
Sometimes, when a device requests a new IP address (different Mac, same circuit_id) instead of handing out the address thats already in the lease database, it hands a new one.
In the legal logging I can see the HW address and the circuit ID for the IP address, however, it doesn’t enter either of those into the lease database.. 

So kea is handing out a lease with no MAC or Client ID associated to it in the database.. 

Here’s what the lease looks like: 

[
    {
        "arguments": {
            "cltt": 1639150521,
            "fqdn-fwd": false,
            "fqdn-rev": false,
            "hostname": "",
            "hw-address": "",
	    "ip-address": “192.168.1.22",
            "state": 1,
            "subnet-id": 2,
            "valid-lft": 86400
        },
        "result": 0,
        "text": "IPv4 lease found."
    }
]

But this is what I have in the legal logging table:

"Address: 192.168.1.22 has been assigned for 1 days 0 hrs 0 mins 0 secs to a device with hardware address: hwtype=1 dc:4a:3e:93:16:a1, client-id: 00:37:38:38:61:32:30:66:63:33:62:62:38:2f:32:2f:62:34:66:62:65:34:65:62:62:33:30:31:2f:31:3a:31:32:31:32”

And when I look up the lease for that client-id:

[
    {
        "arguments": {
            "leases": [
                {
                    "client-id": "00:37:38:38:61:32:30:66:63:33:62:62:38:2f:32:2f:62:34:66:62:65:34:65:62:62:33:30:31:2f:31:3a:31:32:31:32",
                    "cltt": 1639150531,
                    "fqdn-fwd": false,
                    "fqdn-rev": false,
                    "hostname": "desktop-lrv6t8s.",
                    "hw-address": "dc:4a:3e:93:16:a1",
		    "ip-address": “192.168.1.52",
                    "state": 0,
                    "subnet-id": 2,
                    "valid-lft": 86400
                }
            ]
        },
        "result": 0,
        "text": "1 IPv4 lease(s) found."
    }
]


Its almost like kea hands out the IP address before it looks up if the client-id already has a current lease..

Anyone have any ideas as to why this is happening or what I can do to fix it?

Thanks! 

- Allan

> On Dec 10, 2021, at 8:58 AM, Allan Tinker <allan at m33access.com> wrote:
> 
> This morning I woke up to a whole /22 subnet with all the leases claimed, when I run get leases in the API, 
> I have many leases with no hardware addresses or client ids.. (592 of them ) Nothing to tell the server who gets what.. 
> 
> Is there a way to A) not let clients with no MAC or Client ID to obtain a lease, and 
> B) bulk remove these leases in IPv4? 
> 
> Currently Im removing them one by one.
> I still dont know the cause of this, but I want to prevent it by not allowing leases without client data at all. 
> 
> I am using the flex_id hook to swap circuit ID with client ID as well. 
> 
> Thank you
> 
> - Allan
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