weird case for IP duplicated on LAN

IT Support it.compilation at
Mon Feb 23 02:02:08 UTC 2015

Thanks for your replies,

One thing that I forgot to mention is the IP address in conflict is the 
last one in the IP address pool, I wonder if this has any implication or 
something like that with the issue.

On 02/22/2015 04:33 PM, Sten Carlsen wrote:
> On 22/02/15 20:32, IT Support wrote:
>> Hi
>> Thanks Nial for your answer, about logs, just I can see this:
>> dhcpd: DHCPDISCOVER from 00:88:88:88:88:88 via
>> dhcpd: DHCPOFFER on to 00:88:88:88:88:88 via
>> Hi Sten about your answer:
>> Suggest you look for a ClientID in both hosts, probably the same.
>> How can I check the ClientID?
> I dhcpd.leases file it is marked by uid for each lease. The line is
> missing if there is no ClientID.
> If two different MAC addresses ask for an IP but present the same
> ClientID, they are treated like the same host and given the same ID.
> The answer is in the dhcpd.leases file.
>> On 02/22/2015 02:42 PM, Sten Carlsen wrote:
>>> Suggest you look for a ClientID in both hosts, probably the same.
>>> ClientID takes precedence over MAC if present. (There are options to fix
>>> this).
>>> On 22/02/15 19:35, IT Support wrote:
>>>> On 02/20/2015 12:17 PM, IT Support wrote:
>>>>> Hi eveyone. I'm facing a weird case of IP duplicated on my LAN, ISC
>>>>> DHCPd version 4.1.1 running on Debian, this is the case. For example
>>>>> user A already got an IP address from dhcp server (
>>>>> 'till here everything goes ok.  Then user B get connected to the LAN,
>>>>> asking for an IP address to dhcp server, assigning the same IP address
>>>>> to the user A ( creating an IP address conflict.
>>>>       Please someone to throw me a bone here?
>>>> Thanks in advance.
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