A lot DHCP REQUEST

Tue May 8 19:41:47 UTC 2012

Good afternoon,

I use DHCP ISC on my network architecture, but I have noticed that some
clients are sending a lot of DHCP REQUEST, even if the client does ACK for
the REQUEST, the log is:

May  7 05:15:53 dhcp-isc-01 dhcpd: DHCPREQUEST for 190.72.35.198 from
00:30:67:47:a9:f6 (oriana) via 172.17.49.239
May  7 05:15:53 dhcp-isc-01 dhcpd: DHCPACK on 190.72.35.198 to
00:30:67:47:a9:f6 (oriana) via 172.17.49.239
May  7 05:15:58 dhcp-isc-01 dhcpd: DHCPREQUEST for 190.72.35.198 from
00:30:67:47:a9:f6 (oriana) via 172.17.49.239
May  7 05:15:58 dhcp-isc-01 dhcpd: DHCPACK on 190.72.35.198 to
00:30:67:47:a9:f6 (oriana) via 172.17.49.239
May  7 05:16:03 dhcp-isc-01 dhcpd: DHCPREQUEST for 190.72.35.198 from
00:30:67:47:a9:f6 (oriana) via 172.17.49.239
May  7 05:16:03 dhcp-isc-01 dhcpd: DHCPACK on 190.72.35.198 to
00:30:67:47:a9:f6 (oriana) via 172.17.49.239
May  7 05:16:07 dhcp-isc-01 dhcpd: DHCPREQUEST for 190.72.35.198 from
00:30:67:47:a9:f6 (oriana) via 172.17.49.239
May  7 05:16:07 dhcp-isc-01 dhcpd: DHCPACK on 190.72.35.198 to
00:30:67:47:a9:f6 (oriana) via 172.17.49.239
May  7 05:16:12 dhcp-isc-01 dhcpd: DHCPREQUEST for 190.72.35.198 from
00:30:67:47:a9:f6 (oriana) via 172.17.49.239
May  7 05:16:12 dhcp-isc-01 dhcpd: DHCPACK on 190.72.35.198 to
00:30:67:47:a9:f6 (oriana) via 172.17.49.239
May  7 05:16:17 dhcp-isc-01 dhcpd: DHCPREQUEST for 190.72.35.198 from
00:30:67:47:a9:f6 (oriana) via 172.17.49.239
May  7 05:16:17 dhcp-isc-01 dhcpd: DHCPACK on 190.72.35.198 to
00:30:67:47:a9:f6 (oriana) via 172.17.49.239
May  7 05:16:22 dhcp-isc-01 dhcpd: DHCPREQUEST for 190.72.35.198 from
00:30:67:47:a9:f6 (oriana) via 172.17.49.239
May  7 05:16:22 dhcp-isc-01 dhcpd: DHCPACK on 190.72.35.198 to
00:30:67:47:a9:f6 (oriana) via 172.17.49.239
May  7 05:16:27 dhcp-isc-01 dhcpd: DHCPREQUEST for 190.72.35.198 from
00:30:67:47:a9:f6 (oriana) via 172.17.49.239
May  7 05:16:27 dhcp-isc-01 dhcpd: DHCPACK on 190.72.35.198 to
00:30:67:47:a9:f6 (oriana) via 172.17.49.239
May  7 05:16:32 dhcp-isc-01 dhcpd: DHCPREQUEST for 190.72.35.198 from
00:30:67:47:a9:f6 (oriana) via 172.17.49.239
May  7 05:16:32 dhcp-isc-01 dhcpd: DHCPACK on 190.72.35.198 to
00:30:67:47:a9:f6 (oriana) via 172.17.49.239
May  7 05:16:36 dhcp-isc-01 dhcpd: DHCPREQUEST for 190.72.35.198 from
00:30:67:47:a9:f6 (oriana) via 172.17.49.239
May  7 05:16:36 dhcp-isc-01 dhcpd: DHCPACK on 190.72.35.198 to
00:30:67:47:a9:f6 (oriana) via 172.17.49.239
May  7 05:16:41 dhcp-isc-01 dhcpd: DHCPREQUEST for 190.72.35.198 from
00:30:67:47:a9:f6 (oriana) via 172.17.49.239
May  7 05:16:41 dhcp-isc-01 dhcpd: DHCPACK on 190.72.35.198 to
00:30:67:47:a9:f6 (oriana) via 172.17.49.239
May  7 05:16:46 dhcp-isc-01 dhcpd: DHCPREQUEST for 190.72.35.198 from
00:30:67:47:a9:f6 (oriana) via 172.17.49.239

Is there any way to avoid this behavior?

Thanks
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