1、Centos dhcp环境

centos 6.6，dhcp通过yum安装，网卡IP：10.70.11.230/24

2、dhcp配置文件

option domain-name-servers  10.70.11.230;
default-lease-time 432000;   
max-lease-time 432000;
authoritative;
ddns-update-style none;
subnet 10.70.12.0 netmask 255.255.255.0{
       range dynamic-bootp 10.70.12.10 10.70.12.229;
       option broadcast-address 10.70.12.255;
       option routers 10.70.12.1;
}

3、dhcp服务启动报错，日志如下：

Oct  7 10:52:31 sh dhcpd: No subnet declaration for eth0 (10.70.11.230).
Oct  7 10:52:31 sh dhcpd: ** Ignoring requests on eth0.  If this is not what
Oct  7 10:52:31 sh dhcpd:    you want, please write a subnet declaration
Oct  7 10:52:31 sh dhcpd:    in your dhcpd.conf file for the network segment
Oct  7 10:52:31 sh dhcpd:    to which interface eth0 is attached. **
Oct  7 10:52:31 sh dhcpd:
Oct  7 10:52:31 sh dhcpd:
Oct  7 10:52:31 sh dhcpd: Not configured to listen on any interfaces!
Oct  7 10:52:31 sh dhcpd:
Oct  7 10:52:31 sh dhcpd: This version of ISC DHCP is based on the release available
Oct  7 10:52:31 sh dhcpd: on ftp.isc.org.  Features have been added and other changes
Oct  7 10:52:31 sh dhcpd: have been made to the base software release in order to make
Oct  7 10:52:31 sh dhcpd: it work better with this distribution.
Oct  7 10:52:31 sh dhcpd:
Oct  7 10:52:31 sh dhcpd: Please report for this software via the CentOS Bugs Database:
Oct  7 10:52:31 sh dhcpd:     http://bugs.centos.org/
Oct  7 10:52:31 sh dhcpd:
Oct  7 10:52:31 sh dhcpd: exiting.

4、解决问题的方法

Centos dhcpd服务配置的时候一定要将本身IP地址划入DHCP分配范围

调整后的dhcpd.conf

option domain-name-servers  10.70.11.230;
default-lease-time 432000;   
max-lease-time 432000;
authoritative;
ddns-update-style none;

subnet 10.70.11.0 netmask 255.255.255.0{
       range dynamic-bootp 10.70.11.10 10.70.11.229;
       option broadcast-address 10.70.11.255;
       option routers 10.70.11.1;
}

subnet 10.70.12.0 netmask 255.255.255.0{
       range dynamic-bootp 10.70.12.10 10.70.12.229;
       option broadcast-address 10.70.12.255;
       option routers 10.70.12.1;
}