动态主机配置协议(DHCP)是一种客户机/服务器协议，它帮助客户机自动、动态地分配ip地址机器。

DHCP服务器在UDP端口67上运行，DHCP客户端在UDP端口68上运行。

安装和配置DHCP服务器的步骤

(1)安装DHCP包：

yum install dhcpd (in Redhat based OS)

(2)编辑/etc/dhcpd.conf文件:

vi /etc/dhcpd.conf

(3)配置/etc/dhcpd.conf文件：

内容如下：

ddns-update-style interim;
ignore client-updates;

subnet 10.1.1.0 netmask 255.255.255.0 {
range 10.1.1.66 10.1.1.199;

# --- default gateway
option routers 10.1.1.1;
option subnet-mask 255.255.255.0;
option ip-forwarding off;
#option nis-domain "domain.org";
#option domain-name "domain.org";
option domain-name-servers 222.x.x.x, 222.y.y.y;
option broadcast-address 10.255.255.255;
#option time-offset 39600; # Eastern Standard Time

#option netbios-name-servers 10.1.1.1;
# --- Selects point-to-point node (default is hybrid). Dont change this unless
# -- you understand Netbios very well
option netbios-node-type 8;

default-lease-time 1209600;
max-lease-time 1209600;

}

(4)然后重启dhcpd服务

service dhcpd restart

dhcp默认的端口是67和68。