r1\]int g0/0/1 \[r1-GigabitEthernet0/0/1\]ip add 192.168.1.1 24 \[r1\]int s4/0/0 \[r1-Serial4/0/0\]ip add 14.1.1.1 24 \[r4\]int l0 \[r4-LoopBack0\]ip add 4.4.4.4 24 \[r4\]int s3/0/0 \[r4-Serial3/0/0\]ip add 14.1.1.2 24 \[r4-Serial3/0/0\]link-protocol hdlc Warning: The encapsulation protocol of the link will be changed. Continue? \[Y/N
:y
r4\]int s3/0/1 \[r4-Serial3/0/1\]ip add 24.1.1.2 24 \[r4-Serial3/0/1\]ppp authentication-mode pap \[r4\]aaa \[r4-aaa\]local-user a password cipher 123456 \[r4-aaa\]local-user a service-type ppp \[r4-aaa\]local-user b password cipher 654321 \[r4-aaa\]local-user b service-type ppp \[r4\]int s3/0/0 \[r4-Serial3/0/0\]shutdown \[r4-Serial3/0/0\]undo shutdown \[r4\]int s4/0/0 \[r4-Serial4/0/0\]ip add 34.1.1.2 24 \[r4-Serial4/0/0\]ppp \[r4-Serial4/0/0\]ppp authentication-mode chap \[r4-Serial4/0/0\]shutdown \[r4-Serial4/0/0\]undo shutdown \[r1\]int s4/0/0 \[r1-Serial4/0/0\]link-protocol hdlc Warning: The encapsulation protocol of the link will be changed. Continue? \[Y/N
:y
r2\]int g0/0/1 \[r2-GigabitEthernet0/0/1\]ip add 192.168.2.1 24 \[r2\]int s4/0/0 \[r2-Serial4/0/0\]ip add 24.1.1.1 24 \[r2-Serial4/0/0\]ppp pap local-user a password cipher 123456 \[r3\]int g0/0/1 \[r3-GigabitEthernet0/0/1\]ip add 192.168.3.1 24 \[r3\]int s4/0/0 \[r3-Serial4/0/0\]ip add 34.1.1.1 24 \[r3-Serial4/0/0\]ppp chap user b \[r3-Serial4/0/0\]ppp chap password cipher 654321  **要求1-4搞定了** \[r1\]ip route-static 0.0.0.0 0 14.1.1.2 \[r2\]ip route-static 0.0.0.0 0 24.1.1.2 \[r3\]ip route-static 0.0.0.0 0 34.1.1.2 \[r1\]int Tunnel 0/0/0 \[r1-Tunnel0/0/0\]ip add 192.168.4.1 24 \[r1-Tunnel0/0/0\]tunnel-protocol gre p2mp \[r1-Tunnel0/0/0\]source 14.1.1.1 \[r1-Tunnel0/0/0\]nhrp entry multicast dynamic \[r1-Tunnel0/0/0\]nhrp network-id 100  \[r2\]int Tunnel 0/0/0 \[r2-Tunnel0/0/0\]ip add 192.168.4.2 24 \[r2-Tunnel0/0/0\]tunnel-protocol gre p2mp \[r2-Tunnel0/0/0\]source Serial 4/0/0 \[r2-Tunnel0/0/0\]nhrp entry 192.168.4.1 14.1.1.1 register  \[r3\]int Tunnel 0/0/0 \[r3-Tunnel0/0/0\]ip add 192.168.4.3 24 \[r3-Tunnel0/0/0\]tunnel-protocol gre p2mp \[r3-Tunnel0/0/0\]source s4/0/0 \[r3-Tunnel0/0/0\]nhrp entry 192.168.4.1 14.1.1.1 register \[r1\]rip 1 \[r1-rip-1\]ver 2 \[r1-rip-1\]network 192.168.1.0 \[r1-rip-1\]network 192.168.4.0 \[r2\]rip 1 \[r2-rip-1\]version 2 \[r2-rip-1\]network 192.168.4.0 \[r2-rip-1\]network 192.168.2.0 \[r3\]rip 1 \[r3-rip-1\]version 2 \[r3-rip-1\]network 192.168.4.0 \[r3-rip-1\]network 192.168.3.0 \[r1\]int Tunnel 0/0/0 \[r1-Tunnel0/0/0\]undo rip split-horizon （关闭这个口的水平分割）    \[r1\]acl 2000 \[r1-acl-basic-2000\]rule permit source 192.168.1.0 0.0.0.255 \[r1\]int s4/0/0 \[r1-Serial4/0/0\]nat outbound 2000