dhcpd: uid lease 192.168.0.220 for client xx:xx:xx:xx:xx:xx is duplicate on 192.168.0/24

今天一台设备不能正常通过DHCP拿IP，查log记录发现以下错误信息：

Sep 22 18:22:47 box dhcpd: uid lease 192.168.0.220 for client 00:21:19:64:a1:d4 is duplicate on 192.168.0/24
Sep 22 18:22:47 box dhcpd: DHCPDISCOVER from 00:21:19:64:a1:d4 via eth0
Sep 22 18:22:47 box dhcpd: DHCPOFFER on 192.168.0.199 to 00:21:19:64:a1:d4 via eth0
DHCP 服务器配置了192.168.0.199和00:21:19:64:a1:d4 MAC地址做了绑定的，怎么会提示duplicate？查/var/lib/dhcpd/dhcpd.leases文件发现192.168.0.220 之前有和00:21:19:64:a1:d4 MAC地址绑定，怎么会这样，不管了，执行cat /dev/null > dhcpd.leses清空该文件，然后修改default-lease-time 600; 和max-lease-time 7200;最后service dhcpd restart搞定！