拓撲：

R1配置：

interface Serial1/0
ip address negotiated
encapsulation ppp
serial restart-delay 0
ppp chap hostname root@cisco.com
ppp chap password 0 root
!
ip route 0.0.0.0 0.0.0.0 Serial1/0

R2配置：

vpdn enable
vpdn search-order domain
!
vpdn-group lac
request-dialin
protocol l2tp
domain cisco.com
initiate-to ip 23.1.1.3
local name R2
l2tp tunnel password 0 root
interface FastEthernet0/1
ip address 23.1.1.2 255.255.255.0
duplex auto
speed auto
!
interface Serial1/0
no ip address
encapsulation ppp
serial restart-delay 0
ppp authentication chap

R3配置：

vpdn enable
!
vpdn-group lns
accept-dialin
protocol l2tp
virtual-template 1
terminate-from hostname R2
local name R3
l2tp tunnel password 0 root
interface Loopback0
ip address 3.3.3.3 255.255.255.255
!
interface FastEthernet0/0
ip address 34.1.1.3 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 23.1.1.3 255.255.255.0
duplex auto
speed auto
!
interface Virtual-Template1
ip unnumbered Loopback0
peer default ip address pool pool1
ppp authentication chap
!
ip local pool pool1 100.1.1.1 100.1.1.254

ip route 4.4.4.4 255.255.255.255 34.1.1.4

R4配置：

interface Loopback0
ip address 4.4.4.4 255.255.255.255
!
interface FastEthernet0/0
ip address 34.1.1.4 255.255.255.0
duplex auto
speed auto
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 34.1.1.3

驗證：

?

總結

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