1. 做用:實現企業大量主機IP的動態配置和集中管理。 減小工做量,減小人爲配置錯誤。 2. DHCP工做原理: a) 發現階段---發送DHCP discover 報文 b) 提供階段---服務器迴應offer c) 選擇階段----發送request請求 報文 d) 確認階段---服務器迴應 ack確認
1.啓用DHCP功能 2.配置IP POOL, 並排除已經被靜態分配的地址 好比: 網關 、服務器IP、網絡設備接口等 3. IP pool XX netework :X.X.X.X MASK 24 gateway-list: X.X.X.X DNS-list: X.X.X.X Excluded-ip-address:X.X.X.X X.X.X.X **DHCP中繼:當DHCP客戶端 與 DHCP 服務器不在同一個網段的時候, 咱們須要配置 DHCP 中繼**
實驗準備:服務器
[R1]dhcp enable
[R1]ip pool 20
[R1-ip-pool-20]network 192.168.20.0 mask 255.255.255.0
[R1-ip-pool-20]gateway-list 192.168.20.254
[R1-ip-pool-20]dns-list 8.8.8.8
[R1]ip pool 30
[R1-ip-pool-30]network 192.168.30.0 mask 255.255.255.0
[R1-ip-pool-30]gateway-list 192.168.30.254
[R1-ip-pool-30]dns-list 8.8.8.8
[R1]ip pool 40
[R1-ip-pool-40]network 192.168.40.0 mask 255.255.255.0
[R1-ip-pool-40]gateway-list 192.168.40.254
[R1-ip-pool-40]dns-list 8.8.8.8
[R1-GigabitEthernet0/0/0]ip add 192.168.88.1 24
[R1-GigabitEthernet0/0/0]dhcp select global
把VLAN加IP,設置DHCP中繼模式
[H1]int vlan 20
[H1-Vlanif20]ip add 192.168.20.254 24
[H1-Vlanif20]dhcp select relay
[H1-Vlanif20]dhcp relay server-ip 192.168.88.1
[H1-Vlanif30] ip add 192.168.30.254 24
[H1-Vlanif30]dhcp select relay
[H1-Vlanif30]dhcp relay server-ip 192.168.88.1
[H1-Vlanif40]ip address 192.168.40.254 24
[H1-Vlanif40]dhcp select relay
[H1-Vlanif40]dhcp relay server-ip 192.168.88.1
[H1-Vlanif88]ip add 192.168.88.254 24
實驗驗證一:
打開pc1 pc2 pc3 運行:ipconfig:查看地址獲取狀況網絡
實驗驗證二:驗證主機間通訊ide