ADSL 拨号上网

R5模拟PC机，R3模拟CPE,R2模拟CO!R2配置如下：r2#show runBuilding configuration...
Current configuration : 961 bytes!version 12.3service timestamps debug datetime msecservice timestamps log datetime msecno service password-encryption!hostname r2!boot-start-markerboot-end-marker!!no aaa new-modelip subnet-zero!!no ip domain lookup!ip cefvpdn enable!vpdn-group 1 accept-dialin protocol pppoe virtual-template 1!async-bootp dns-server 192.1.1.1!!!!!!!!!!!username 123 password 123!!!!interface Loopback0 ip address 1.1.1.1 255.255.255.0!interface FastEthernet0/0 no ip address duplex half pppoe enable!interface ATM1/0 no ip address shutdown no atm ilmi-keepalive!interface Virtual-Template1 ip address 192.1.1.1 255.255.255.0 peer default ip address pool 123 ppp authentication chap!ip local pool 123 192.1.1.2 192.1.1.100ip classlessip http server!!!!!!!!!gatekeeper shutdown!!line con 0 exec-timeout 0 0 logging synchronous stopbits 1line aux 0 stopbits 1line vty 0 4!!endR3配置如下：R3#show runBuilding configuration...
Current configuration : 1054 bytes!version 12.3service timestamps debug datetime msecservice timestamps log datetime msecno service password-encryption!hostname R3!boot-start-markerboot-end-marker!!no aaa new-modelip subnet-zero!!no ip domain lookupip dhcp excluded-address 192.168.1.1!ip dhcp pool zc import all network 192.168.1.0 255.255.255.0 default-router 192.168.1.1!ip cef!!!!!!!!!!!!!!!interface FastEthernet0/0 no ip address duplex half pppoe enable pppoe-client dial-pool-number 1!interface FastEthernet1/0 ip address 192.168.1.1 255.255.255.0 ip nat inside duplex half!interface Dialer1 ip address negotiated ip mtu 1492 ip nat outside encapsulation ppp dialer pool 1 ppp chap hostname 123 ppp chap password 123!ip nat inside source list 1 interface Dialer1
overloadip classlessip route 0.0.0.0 0.0.0.0 Dialer1no ip http server!!access-list 1 permit 192.168.1.0 0.0.0.255no cdp run!!!!!!!gatekeeper shutdown!!line con 0 stopbits 1line aux 0 stopbits 1line vty 0 4!!endR5配置如下：pc1#show runBuilding configuration...
Current configuration : 752 bytes!version 12.3service timestamps debug datetime msecservice timestamps log datetime msecno service password-encryption!hostname pc1!boot-start-markerboot-end-marker!!no aaa new-modelip subnet-zerono ip routing!!no ip domain lookup!no ip cef!!!!!!!!!!!!!!!interface FastEthernet0/0 no ip address no ip route-cache shutdown duplex half!interface FastEthernet1/0 ip address dhcp no ip route-cache duplex auto speed auto!interface FastEthernet1/1 no ip address no ip route-cache shutdown duplex auto speed auto!ip classlessno ip http server!!no cdp run!!!!!!!gatekeeper shutdown!!line con 0 exec-timeout 0 0 logging synchronous stopbits 1line aux 0 stopbits 1line vty 0 4!!end

PC机测试结果如下：pc1#ping 1.1.1.1
Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 4/31/56 mspc1#show ip int briInterface IP-Address OK? Method Status ProtocolFastEthernet0/0 unassigned YES unset administratively down downFastEthernet1/0 192.168.1.2 YES DHCP up up FastEthernet1/1 unassigned YES unset administratively down downpc1#show int sepc1#show int f1/0FastEthernet1/0 is up, line protocol is up Hardware is i82543 (Livengood), address is ca04.0fe8.001c (bia ca04.0fe8.001c) Internet address is 192.168.1.2/24 MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) Full-duplex, 100Mb/s, 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:06, output 00:00:09, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 250 packets input, 19119 bytes Received 12 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog 0 input packets with dribble condition detected 252 packets output, 20355 bytes, 0 underruns 0 output errors, 0 collisions, 1 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier 0 output buffer failures, 0 output buffers swapped out如有不明白的，请留言，定会详细解释！谢谢浏览！