DHCPv4

根据下表配置DHCPv4服务器。

workstation主机上的/home/student/cr-network/files/dhcp目录中提供了部分DHCP配置文件。

2.1 安装dhcp-server软件包。（配置之前要确定服务主机提供dhcp服务的网卡已经配置）

[root@servera ~]# yum -y install dhcp-server

2.2 编辑/etc/dhcp/dhcpd.conf文件，内容如下所示：

[root@servera <sub>]# cat /etc/dhcp/dhcpd.conf 
#
# DHCP Server Configuration file.
#   see /usr/share/doc/dhcp-server/dhcpd.conf.example （注意：需要复制这一行，因为这是例子。）
#   see dhcpd.conf(5) man page
#
[root@servera </sub>]# cp /usr/share/doc/dhcp-server/dhcpd.conf.example /etc/dhcp/dhcpd.conf 
cp: overwrite '/etc/dhcp/dhcpd.conf'? yes
[root@servera <sub>]# 
[root@servera </sub>]# vim /etc/dhcp/dhcpd.conf
authoritative;
log-facility local7;

# A slightly different configuration for an internal subnet.
subnet 192.168.62.0 netmask 255.255.255.0 {
  range 192.168.62.200 192.168.62.249;
  option broadcast-address 192.168.62.255;
  option domain-name-servers 192.168.62.11;
  option domain-search "pvt.example.net", "lab.example.com", "example.com";
  default-lease-time 600;
  max-lease-time 7200;
}

host serverc {           #(配置固定IP地址时，需要有目标主机网口的mac地址)
  hardware ethernet 52:54:00:01:fa:0c;
  fixed-address 192.168.62.12;
}

2.3 使用dhcpd -t命令验证/etc/dhcp/dhcpd.conf的语法，如果命令报告任何错误，请在继续之前更正他们。

[root@servera ~]# dhcpd -t

2.4 启用并设置开机自启。

[root@servera ~]# systemctl enable --now dhcpd

2.5 确认服务正在运行。

[root@servera ~]# systemctl is-active dhcpd
active

2.6 将dhcp服务添加到防火墙规则中。

[root@servera <sub>]# firewall-cmd --add-service=dhcp
success
[root@servera </sub>]# firewall-cmd --add-service=dhcp --permanent 
success
[root@servera <sub>]# firewall-cmd --reload
success
[root@servera </sub>]# firewall-cmd --list-all | grep services
  services: cockpit dhcp dhcpv6-client ssh

2.7 在serverc主机上自动获取地址。

[root@serverc <sub>]# nmcli connection add con-name dhcp-ipv type ethernet ifname eth1
[root@serverc </sub>]# nmcli connection up dhcp-ipv