Unwanted DHCP Clients Requests ISC-DHCP-SERVER

Fri May 17 16:03:44 UTC 2013

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