redhat7.3
1.设置host、firewald、selinuxhostnamectl set-hostname fengxiaoli41.com
systemctl stop firewalld.service
systemctl disable firewalld.service
setenforce 0
2.配置基本dhcp服务
yum install -y dhcp
vim /etc/dhcp/dhcpd.conf
#全局参数
option domain-name "fengxiaoli41.com";
option domain-name-servers dns.fengxiaoli41.com;
default-lease-time 600;
max-lease-time 7200;
authoritative;
log-facility local7;
#配置192.168.1.0网段动态获取
subnet 192.168.1.0 netmask 255.255.255.0 {
range dynamic-bootp 192.168.1.20 192.168.1.254;
option broadcast-address 192.168.1.255;
option routers 192.168.1.1;
}
#配置192.168.1.0网络给该mac分配固定ip
host feng {
#hardware ethernet MAC
fixed-address 192.168.1.5;
}
systemctl restart dhcpd
systemctl status dhcpd
-------------至此客户端可以获取动态和固定ip
3.中继服务器
vim /etc/dhcp/dhcpd.conf
#配置192.168.2.0为dhcp中继网段（若没有中）
subnet 192.168.2.0 netmask 255.255.255.0 {
range dynamic-bootp 192.168.2.20 192.168.2.254;
option broadcast-address 192.168.2.255;
option routers 192.168.2.254;
}
cp /lib/systemd/system/dhcrelay.service /etc/systemd/system/
cd /etc/systemd/system/
vim dhcrelay.service
ExecStart=/usr/sbin/dhcrelay -d --no-pid 192.168.1.10
4.重启服务
systemctl --system daemon-reload
systemctl restart dhcrelay.service
注：配置之前先要保证dhcp服务器和中继服务器网络互通，dhcp服务器为192.168.1.0网段，中继服务器192.168.2.0网段。另外也可在dhcp服务器上添加两块网卡，将中继服务器与dhcp服务器配置在同一服务器上。
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