Unwanted DHCP Clients Requests ISC-DHCP-SERVER

[Steven Carr]

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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