【Oracle Linux】建立DHCP Server

系統概要

• Host OS: Hyper-V Server 2019
• Guest OS: Oracle Linux 9
• NIC: Realtek GbE Family Controller*2 (WAN & LAN)

步驟

1. 安裝DHCP伺服器套件

   sudo dnf install dhcp-server -y

2. 編輯DHCP伺服器設定檔 /etc/dhcp/dhcpd.conf

   sudo nano /etc/dhcp/dhcpd.conf

   • 在檔案中加入以下內容，建立DHCP Server：

     #
     # DHCP Server Configuration file.
     #   see /usr/share/doc/dhcp-server/dhcpd.conf.example
     #   see dhcpd.conf(5) man page
     #
     
     default-lease-time 3600;
     max-lease-time 38400;
     authoritative;
     
     subnet 192.168.1.0 netmask 255.255.255.0 {
             range 192.168.1.100 192.168.1.254;
             option routers 192.168.1.1;
             option subnet-mask 255.255.255.0;
             option domain-name-servers 8.8.8.8, 1.1.1.1;
     }

3. 啟用DHCP伺服器服務

   sudo systemctl enable dhcpd
   sudo systemctl start dhcpd

DHCP IP綁定

1. 編輯DHCP伺服器設定檔 /etc/dhcp/dhcpd.conf

   sudo nano /etc/dhcp/dhcpd.conf

   • 在檔案中加入以下內容，設定IP綁定(可自行增加多個host)：

     // ...
     subnet 192.168.1.0 netmask 255.255.255.0 {
             // ...
             group {
               host [PC_NAME_0] {
                 hardware ethernet 00:11:22:33:44:55;
                 fixed-address 192.168.1.100;
               }
               host [PC_NAME_1] {
                 hardware ethernet 01:11:22:33:44:55;
                 fixed-address 192.168.1.101;
               }
               // ...
             }
     }

2. 重新啟動DHCP伺服器服務

   sudo systemctl restart dhcpd

   • 目標電腦需要重開網路介面才會更新IP(或等待DHCP租約到期)

     sudo nmcli connection down [CONNECTION_NAME]
     sudo nmcli connection up [CONNECTION_NAME]