Lab 5-5 Configuring the Cisco IOS DHCP Server

Topology

GNS檔案

R1
!
!Step 0: Basic Setting
conf t
hostname R1
no ip domain-lookup
end
!
!Step 1: Assign IP Addresses
conf t
int s 0/0
ip add 172.16.12.1 255.255.255.0
bandwidth 64
no sh
!
int lo 1
ip add 172.16.1.1 255.255.255.0
no sh
end
!
!Step 2: Configure EIGRP
conf t
router eigrp 1
no auto-summary
network 172.16.0.0
end
!
!Step 6: Configure the IP Helper Address
conf t
int lo 1
ip helper-address 172.16.2.1
!
!備註:預設啟用DHCP Relay後，若收到下列UDP廣播時會自動將該封包轉送至ip helper-address
!TFTP UDP 69
!DNS UDP 53
!Time Service UDP 37
!NetBios Name Server UDP 137
!NetBios Datagram Server UDP 138
!Boot Protocol UDP 67,68
!TACACS Service UDP 49
!IEN-116 Name Service UDP 42
!
!手動增加其他特殊的UDP廣播封包(以UDP 50000為例)
conf t
ip forward-protocol udp 50000
end

R2
!
!Step 0: Basic Setting
conf t
hostname R2
no ip domain-lookup
end
!
!Step 1: Assign IP Addresses
!設定介面IP
conf t
int s 0/0
ip add 172.16.12.2 255.255.255.0
bandwidth 64
no sh
!
int lo 2
ip add 172.16.2.1 255.255.255.0
no sh
!
int fa 0/0
ip add 172.16.23.2 255.255.255.0
no sh
end
!
!Step 2: Configure EIGRP
conf t
router eigrp 1
no auto-summary
network 172.16.0.0
end
!
!Step 3: Configure a DHCP Pool
conf t
!設備被排除配發的DHCP範圍
ip dhcp excluded-address 172.16.23.1 172.16.23.100
!設定DHCP派發的領域資訊
ip dhcp pool VLAN1-POOL
network 172.16.23.0 255.255.255.0
default-router 172.16.23.2
domain-name Cisco.com
!設定租期
lease 1 5 36
!
!Step 5: Verify DHCP Configuration on Server
show ip dhcp binding
show ip dhcp pool
show ip dhcp server statistics
!
!Step 6: DHCPRELEASE and DHCPRENEW
debug dhcp detail

R3
!
!Step 0: Basic Setting
conf t
hostname R3
no ip domain-lookup
end
!
!Step 3: Configure a DHCP Pool
conf t
no ip routing
int fa 0/0
no ip address
ip address dhcp
no sh
end
!
!Step 4: Verify DHCP Lease on Client
show ip int brief
show ip route 
!
!Step 6: DHCPRELEASE and DHCPRENEW
conf t
int fa 0/0
sh
no sh
release dhcp int fa 0/0
renew dhcp int fa 0/0

show指令
show ip int brief
show ip route
show ip dhcp binding
show ip dhcp pool
show ip dhcp server statistics
show ip helper-address

debug指令
debug ip dhcp server events
debug ip dhcp server packets
debug ip packet detail

參考文件
Understanding and Troubleshooting DHCP in Catalyst Switch or Enterprise Networks

Configuring DHCP