GW(网关路由)
ip dhcp excluded-address 100.1.1.1
ip dhcp excluded-address 200.1.1.1
!
ip dhcp pool PPPOE-LT
network 200.1.1.0 255.255.255.0
dns-server 114.114.114.114
default-router 200.1.1.1
!
ip dhcp pool PPPOE-DX
network 100.1.1.0 255.255.255.0
dns-server 114.114.114.114
default-router 100.1.1.1
interface Ethernet0/0
no switchport
ip address 200.1.1.1 255.255.255.0
!
interface Ethernet0/1
no switchport
ip address 100.1.1.1 255.255.255.0
!
interface Ethernet0/2
no switchport
ip address 192.168.100.1 255.255.255.0
R4
interface Ethernet0/0
no switchport
ip address dhcp
ip helper-address 200.1.1.1
R2
interface Ethernet0/0
no switchport
ip address dhcp
ip helper-address 100.1.1.1
R3
interface Loopback0
ip address 8.8.8.8 255.255.255.0