Unwanted DHCP Clients Requests ISC-DHCP-SERVER

Fri May 17 16:26:32 UTC 2013

Hi Steven

Thanks for the information, i will discover further.

Thanks / Regards

> It may also indicate that there is VLAN/broadcast domain leakage if
> you are seeing broadcast packets from other networks on your network.
>
>
> On 17 May 2013 17:21, Steven Carr <sjcarr at gmail.com> wrote:
>> Speak to your network administrator and tell them to remove the IP
>> helper for the networks you do not provide DHCP for.
>>
>> From DHCP just remove the network scopes as well, it makes no
>> difference if they are defined as the physical network is going to
>> push the DHCP requests to your DHCP server anyway, so until the
>> network admin changes the network config you will just have to ignore
>> the unwanted requests and ignore them in the logs.
>>
>>
>> On 17 May 2013 17:03, Prabhpal S. Mavi <prabhpal at digital-infotech.net>
>> wrote:
>>> Dear DHCP Gurus
>>>
>>> i have full of log with unwanted dhcp client requests that i don't
>>> suppose
>>> to receive. i applied following solution but did not help. anyone have
>>> idea to stop them ?
>>>
>>>
>>> subnet 192.168.3.0 netmask 255.255.255.0 {
>>> range 192.168.3.100;
>>> ignore booting;
>>> }
>>> subnet 192.168.4.0 netmask 255.255.255.0 {
>>> range 192.168.4.100;
>>> ignore booting;
>>> }
>>>
>>>
>>> i have thousands of this requests.
>>>
>>> May 17 15:58:18 captive dhcpd: DHCPREQUEST for 192.168.4.235
>>> (192.168.3.133) from 00:16:44:63:4b:e1 via eth0: wrong network.
>>> May 17 15:58:18 captive dhcpd: DHCPNAK on 192.168.4.235 to
>>> 00:16:44:63:4b:e1 via eth0
>>> May 17 15:58:21 captive dhcpd: DHCPREQUEST for 192.168.4.235
>>> (192.168.3.133) from 00:16:44:63:4b:e1 via eth0: wrong network.
>>> May 17 15:58:21 captive dhcpd: DHCPNAK on 192.168.4.235 to
>>> 00:16:44:63:4b:e1 via eth0
>>> May 17 15:58:22 captive dhcpd: DHCPREQUEST for 192.168.4.235
>>> (192.168.3.133) from 00:16:44:63:4b:e1 via eth0: wrong network.
>>> May 17 15:58:22 captive dhcpd: DHCPNAK on 192.168.4.235 to
>>> 00:16:44:63:4b:e1 via eth0
>>> May 17 15:58:22 captive dhcpd: DHCPREQUEST for 192.168.4.235
>>> (192.168.3.133) from 00:16:44:63:4b:e1 via eth0: wrong network.
>>> May 17 15:58:22 captive dhcpd: DHCPNAK on 192.168.4.235 to
>>> 00:16:44:63:4b:e1 via eth0
>>> May 17 15:58:23 captive dhcpd: DHCPREQUEST for 192.168.4.235
>>> (192.168.3.133) from 00:16:44:63:4b:e1 via eth0: wrong network.
>>> May 17 15:58:23 captive dhcpd: DHCPNAK on 192.168.4.235 to
>>> 00:16:44:63:4b:e1 via eth0
>>> May 17 15:58:26 captive dhcpd: DHCPREQUEST for 192.168.4.235
>>> (192.168.3.133) from 00:16:44:63:4b:e1 via eth0: wrong network.
>>> May 17 15:58:26 captive dhcpd: DHCPNAK on 192.168.4.235 to
>>> 00:16:44:63:4b:e1 via eth0
>>> May 17 15:58:26 captive dhcpd: DHCPREQUEST for 192.168.4.235
>>> (192.168.3.133) from 00:16:44:63:4b:e1 via eth0: wrong network.
>>> May 17 15:58:26 captive dhcpd: DHCPNAK on 192.168.4.235 to
>>> 00:16:44:63:4b:e1 via eth0
>>> May 17 15:58:29 captive dhcpd: DHCPREQUEST for 192.168.4.235
>>> (192.168.3.133) from 00:16:44:63:4b:e1 via eth0: wrong network.
>>> May 17 15:58:29 captive dhcpd: DHCPNAK on 192.168.4.235 to
>>> 00:16:44:63:4b:e1 via eth0
>>> May 17 15:58:59 captive dhcpd: DHCPREQUEST for 192.168.4.87 from
>>> 7c:11:be:63:32:d2 via eth0: wrong network.
>>> May 17 15:58:59 captive dhcpd: DHCPNAK on 192.168.4.87 to
>>> 7c:11:be:63:32:d2 via eth0
>>> May 17 15:59:01 captive dhcpd: DHCPREQUEST for 192.168.4.87
>>> (192.168.3.133) from 7c:11:be:63:32:d2 via eth0: wrong network.
>>> May 17 15:59:01 captive dhcpd: DHCPNAK on 192.168.4.87 to
>>> 7c:11:be:63:32:d2 via eth0
>>> May 17 15:59:26 captive dhcpd: DHCPREQUEST for 192.168.4.235
>>> (192.168.3.133) from 00:16:44:63:4b:e1 via eth0: wrong network.
>>> May 17 15:59:26 captive dhcpd: DHCPNAK on 192.168.4.235 to
>>> 00:16:44:63:4b:e1 via eth0
>>> May 17 15:59:32 captive dhcpd: DHCPINFORM from 192.168.4.235 via eth0
>>> May 17 15:59:32 captive dhcpd: DHCPACK to 192.168.4.235
>>> (00:16:44:63:4b:e1) via eth0
>>>
>>> Thanks
>>>
>>>
>>>
>>>
>>>
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>>> dhcp-users at lists.isc.org
>>> https://lists.isc.org/mailman/listinfo/dhcp-users
>