实验拓扑图

 

 

IP地址规划

客户机：192.168.1.1 255.255.255.0

R1：

f0/0 192.168.1.254 255.255.255.0

R2:

f1/0 1.1.1.1 255.255.255.0

 

基本配置步骤：

 

R1

Router>en Router#conf t Router(config)#hostname R1 R1(config)#int f1/0    R1(config-if)#pppoe enable   R1(config-if)#pppoe-client dial-pool-number 1 R1(config-if)#no sh R1(config-if)#exit R1(config)#int dialer 1 R1(config-if)#ip address negotiated  R1(config-if)#encapsulation ppp R1(config-if)#ppp pap sent-username xiaowu password xiaowu R1(config-if)#ppp authentication pap callin R1(config-if)#mtu 1492 R1(config-if)#dialer pool 1 R1(config-if)#end R1#conf t R1(config)#int f0/0 R1(config-if)#ip address 192.168.1.254 255.255.255.0 R1(config-if)#no sh R1(config-if)#end R1#

 

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R2

Router>en Router#conf t Router(config)#hostname R2 R2(config)#vpdn enable  R2(config)#vpdn-group 1 R2(config-vpdn)#accept-dialin R2(config-vpdn-acc-in)#protocol pppoe R2(config-vpdn-acc-in)#virtual-template 1 R2(config-vpdn-acc-in)#end R2#conf t R2(config)#int virtual-template 1 R2(config-if)#ip address 1.1.1.1 255.255.255.0 R2(config-if)#encapsulation ppp R2(config-if)#peer default ip address pool xiaowu R2(config-if)#ppp authentication pap R2(config-if)#no sh R2(config-if)#exit R2(config)#ip local pool xiaowu 100.1.1.1 100.1.1.100 R2(config)#username xiaowu password xiaowu R2(config)#int f1/0 R2(config-if)#pppoe enable  R2(config-if)#no sh R2(config-if)#end R2#

 

 

观察路由表

 

R1

 

R1#show ip route  *Mar 28 13:36:57.495: %SYS-5-CONFIG_I: Configured from console by console Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP        D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area         N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2        E1 - OSPF external type 1, E2 - OSPF external type 2        i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2        ia - IS-IS inter area, * - candidate default, U - per-user static route        o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

     1.0.0.0/32 is subnetted, 1 subnets C       1.1.1.1 is directly connected, Dialer1      100.0.0.0/32 is subnetted, 1 subnets C       100.1.1.1 is directly connected, Dialer1 C    192.168.1.0/24 is directly connected, FastEthernet0/0 R1#

 

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R2

 

R2#show ip route  Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP        D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area         N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2        E1 - OSPF external type 1, E2 - OSPF external type 2        i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2        ia - IS-IS inter area, * - candidate default, U - per-user static route        o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

     1.0.0.0/24 is subnetted, 1 subnets C       1.1.1.0 is directly connected, Virtual-Access1.1      100.0.0.0/32 is subnetted, 1 subnets C       100.1.1.1 is directly connected, Virtual-Access1.1 R2#

 

我们所配置100.0.0.0网段已经被注入到对方，这就是PPP的一个特点，连接PPP的一条线路的两端无需是同一个网段，NCP会自动将对端注入到路由之中。当然，这样配置完成仅仅是拨号成功，客户端依然不能上网，需要做NAT，准确的说是PAT，这里面就不做演示了。

本文转自 Jhuster 51CTO博客，原文链接：http://blog.51cto.com/xwnet/143153，如需转载请自行联系原作者