[kea-dev] I'd appreciate some feedback on trac ticket 3963 :)

[Angelo Failla]

On August 4, 2015 at 6:30:09 PM, Marcin Siodelski (marcin at isc.org<mailto:marcin at isc.org>) wrote:


On 04.08.2015 17:35, Angelo Failla wrote:
> On August 4, 2015 at 4:34:30 PM, Marcin Siodelski (marcin at isc.org
> <mailto:marcin at isc.org>) wrote:
>>
>> > one nice thing to also get rid of, when enabling the stateless switch,
>> > is to
>> > avoid this horrible hack to allow KEA to start :)
>> >
>> > 'subnet4' => [
>> > {
>> > 'subnet' => '0.0.0.0/0',
>> > 'pools' => [{ 'pool' => '0.0.0.0-255.255.255.255' }]
>> > },
>> > ],
>> >
>>
>> As a matter of curiosity. If you're having this hack already could you
>> possibly implement the lease4_select hook to set the yiaddr to non-zero
>> value in the DHCPOFFER, which would case processDiscover to not drop the
>> packet?
>>
>
> Yeah, I will try that and report back.


Actually, wouldn't it suffice to just restrict the pool to
0.0.0.1-255.255.255.255C?

That way none of the clients would ever be assigned a zero address and
the packet wouldn't be dropped.

So I tried that, and compiled my hook lib w/o the change in https://github.com/isc-projects/kea/pull/11
and it doesn’t solve the problem, I see that only my pkt4_receive callout gets called, then I see

2015-08-04 12:34:59.869 ERROR [kea-dhcp4.bad-packets/966953] DHCP4_PACKET_NAK_0001
[hwtype=1 00:02:c9:de:70:4e], cid=[no info], tid=0x2eed: failed to select a subnet for incoming packet,
src 10.35.139.81, type DHCPDISCOVER

and that’s it. no pkt4_send is called.

config has this:

"subnet4": [
  {
    "subnet": "0.0.0.1/0",
    "pools": [
      {
        "pool": "0.0.0.1-255.255.255.255"
      }
    ]
  }
]

Anyway, it’s not a big deal, we got a version that is going to prod with my github change above for the time
being.

let me know how your meeting goes in relation to the proposed change.

--
Angelo Failla - Cluster Infrastructure Dublin
pallotron at fb.com
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