什么情况下dhcp服务器会给客户端别人已经在使用的IP呢？

[weixin_38081679]

什么情况下dhcp服务器会给客户端别人已经在使用的IP呢？
我的dhcp服务器（运行在linux上）日志如下：

Jul 12 17:43:14 png3-6 dhcpd: DHCPDISCOVER from 00:14:c2:e7:5e:01 via eth1
Jul 12 17:43:14 png3-6 dhcpd: DHCPOFFER on 10.255.255.164 to 00:14:c2:e7:5e:01 (haki via eth1
Jul 12 17:43:14 png3-6 dhcpd: DHCPREQUEST for 10.255.255.164 (10.255.1.1) from 00:14:c2:e7:5e:01 (haki via eth1
Jul 12 17:43:14 png3-6 dhcpd: DHCPACK on 10.255.255.164 to 00:14:c2:e7:5e:01 (haki via eth1
Jul 12 17:43:14 png3-6 dhcpd: DHCPDECLINE of 10.255.255.164 from 00:14:c2:e7:5e:01 (haki via eth1: not found
Jul 12 17:43:24 png3-6 dhcpd: DHCPDISCOVER from 00:14:c2:e7:5e:01 via eth1
Jul 12 17:43:24 png3-6 dhcpd: DHCPOFFER on 10.255.254.139 to 00:14:c2:e7:5e:01 (haki via eth1
Jul 12 17:43:24 png3-6 dhcpd: DHCPREQUEST for 10.255.254.139 (10.255.1.1) from 00:14:c2:e7:5e:01 (haki via eth1
Jul 12 17:43:24 png3-6 dhcpd: DHCPACK on 10.255.254.139 to 00:14:c2:e7:5e:01 (haki via eth1
Jul 12 17:43:24 png3-6 dhcpd: DHCPDECLINE of 10.255.254.139 from 00:14:c2:e7:5e:01 (haki via eth1: not found
Jul 12 17:43:34 png3-6 dhcpd: DHCPDISCOVER from 00:14:c2:e7:5e:01 via eth1
Jul 12 17:43:34 png3-6 dhcpd: DHCPOFFER on 10.255.254.38 to 00:14:c2:e7:5e:01 (haki via eth1
Jul 12 17:43:34 png3-6 dhcpd: DHCPREQUEST for 10.255.254.38 (10.255.1.1) from 00:14:c2:e7:5e:01 (haki via eth1
Jul 12 17:43:34 png3-6 dhcpd: DHCPACK on 10.255.254.38 to 00:14:c2:e7:5e:01 (haki8) via eth1
Jul 12 17:43:34 png3-6 dhcpd: DHCPDECLINE of 10.255.254.38 from 00:14:c2:e7:5e:01 (haki8) via eth1: not found


如果我只是重起dhcpd， 没有用。
如果我重起整个linux， 问题就没有了。不过过大概一天，又会有同样的问题。


谢谢！