第一步：划分地址
由实验要求可知R1、R2、R4各有两个用户网段，且R5需要一个用户网段，所以在此处我们可以将R1、R2、R4的用户网段看成一个，然后再进行二次划分，然后加上骨干网段，我们一共需要8个网段:
192.168.1.0/24 借3位划分:
192.168.1.000 00000/27 ----------骨干链路 192.168.1.0/27
向192.168.1.0/27再借三位划分:
192.168.1.000 000 00/30 ------------192.168.1.0/30
192.168.1.000 001 00/30 ------------192.168.1.4/30
192.168.1.000 010 00/30 ------------192.168.1.8/30
192.168.1.000 011 00/30 ------------192.168.1.12/30
192.168.1.000 100 00/30 ------------192.168.1.16/30
192.168.1.000 101 00/30 ------------192.168.1.20/30
用作保留
192.168.1.000 110 00/30
192.168.1.000 111 00/30
环回地址
192.168.1.001 00000/27 ----------R1 192.168.1.32/27
? 192.168.1.001 0 0000/28 192.168.1.32/28
? 192.168.1.001 1 0000/28 192.168.1.48/28
192.168.1.010 00000/27 -----------R2 192.168.1.64/27
? 192.168.1.010 0 0000/28 192.168.1.64/28
? 192.168.1.010 1 0000/28 192.168.1.80/28
192.168.1.011 00000/27 -------------R4 192.168.1.96/27
? 192.168.1.011 0 0000/28 192.168.1.96/28
? 192.168.1.011 1 0000/28 192.168.1.112/28
192.168.1.100 00000/27 ----------- --R5 192.168.1.128/27
? 192.168.1.100 0 0000/28 192.168.1.128/28
R3（用作DHCP）
192.168.1.101 00000/27 ----------192.168.1.160/27
用作保留
192.168.1.110 00000/27
192.168.1.111 00000/27
第二步：配置IP地址
R1
[r1]int g0/0/0
[r1-GigabitEthernet0/0/0]ip add 192.168.1.1 30
[r1-GigabitEthernet0/0/0]int g0/0/1
[r1-GigabitEthernet0/0/1]ip add 192.168.1.13 30
[r1-GigabitEthernet0/0/1]int l0
[r1-LoopBack0]ip add 192.168.1.33 28
[r1-LoopBack0]int l1
[r1-LoopBack1]ip add 192.168.1.49 28
[r1-LoopBack1]
R2
[r2]int g0/0/0
[r2-GigabitEthernet0/0/0]ip add 192.168.1.2 30
[r2-GigabitEthernet0/0/0]int g0/0/1
[r2-GigabitEthernet0/0/1]ip add 192.168.1.5 30
[r2-GigabitEthernet0/0/1]int l0
[r2-LoopBack0]ip add 192.168.1.65 28
[r2-LoopBack0]int l1
[r2-LoopBack1]ip add 192.168.1.81 28
[r2-LoopBack1]
R3
[r3]int g0/0/1
[r3-GigabitEthernet0/0/1]ip add 192.168.1.14 30
[r3-GigabitEthernet0/0/1]int g0/0/0
[r3-GigabitEthernet0/0/0]ip add 192.168.1.9 30
[r3-GigabitEthernet0/0/0]int g0/0/2
[r3-GigabitEthernet0/0/2]ip add 192.168.1.161 27
[r3-GigabitEthernet0/0/2]
R4
[r4]int g0/0/0
[r4-GigabitEthernet0/0/0]ip add 192.168.1.6 30
[r4-GigabitEthernet0/0/0]int g0/0/1
[r4-GigabitEthernet0/0/1]ip add 192.168.1.10 30
[r4-GigabitEthernet0/0/1]int g0/0/2
[r4-GigabitEthernet0/0/2]ip add 192.168.1.17 30
[r4-GigabitEthernet0/0/2]int g4/0/0
[r4-GigabitEthernet4/0/0]ip add 192.168.1.21 30
[r4-GigabitEthernet4/0/0]int l0
[r4-LoopBack0]ip add 192.168.1.97 28
[r4-LoopBack0]int l1
[r4-LoopBack1]ip add 192.168.1.113 28
[r4-LoopBack1]
R5
[r5]int g0/0/0
[r5-GigabitEthernet0/0/0]ip add 192.168.1.18 30
[r5-GigabitEthernet0/0/0]int g0/0/1
[r5-GigabitEthernet0/0/1]ip add 12.0.0.1 24
[r5-GigabitEthernet0/0/1]int g0/0/2
[r5-GigabitEthernet0/0/2]ip add 192.168.1.22 30
[r5-GigabitEthernet0/0/2]int l0
[r5-LoopBack0]ip add 192.168.1.129 28
R6
sy
sy r6
[r6]int g0/0/0
[r6-GigabitEthernet0/0/0]ip add 12.0.0.2 24
[r6-GigabitEthernet0/0/0]int l0
[r6-LoopBack0]ip add 1.1.1.1 24
[r6-LoopBack0]
第三步：R3下两台pc通过DHCP获取IP地址
[r3]dhcp enable
[r3]ip pool dhcp
[r3-ip-pool-dhcp]network 192.168.1.160 mask 27
[r3-ip-pool-dhcp]gateway-list 192.168.1.161
[r3-ip-pool-dhcp]dns-list 114.114.114.114
[r3-ip-pool-dhcp]int g0/0/2
[r3-GigabitEthernet0/0/2]dhcp select global
[r3-GigabitEthernet0/0/2]
PC1：
PC2：
第四步配置静态路由和缺省
R1：
[r1]ip route-static 192.168.1.4 30 192.168.1.2
[r1]ip route-static 192.168.1.8 30 192.168.1.14
[r1]ip route-static 192.168.1.160 27 192.168.1.14
[r1]ip route-static 192.168.1.16 30 192.168.1.2
[r1]ip route-static 192.168.1.16 30 192.168.1.14
[r1]ip route-static 192.168.1.64 27 192.168.1.2
[r1]ip route-static 192.168.1.96 27 192.168.1.2
[r1]ip route-static 192.168.1.128 27 192.168.1.2
R2：
[r2]ip route-static 192.168.1.12 30 192.168.1.1
[r2]ip route-static 192.168.1.8 30 192.168.1.6
[r2]ip route-static 192.168.1.16 30 192.168.1.6
[r2]ip route-static 192.168.1.160 27 192.168.1.1
[r2]ip route-static 192.168.1.160 27 192.168.1.6
[r2]ip route-static 192.168.1.32 27 192.168.1.1
[r2]ip route-static 192.168.1.96 27 192.168.1.6
[r2]ip route-static 192.168.1.128 27 192.168.1.6
R3：
[r3]ip route-static 192.168.1.0 30 192.168.1.13
[r3]ip route-static 192.168.1.4 30 192.168.1.10
[r3]ip route-static 192.168.1.16 30 192.168.1.10
[r3]ip route-static 192.168.1.32 27 192.168.1.13
[r3]ip route-static 192.168.1.64 27 192.168.1.13
[r3]ip route-static 192.168.1.64 27 192.168.1.10
[r3]ip route-static 192.168.1.96 27 192.168.1.10
[r3]ip route-static 192.168.1.128 27 192.168.1.10
R4：
[r4]ip route-static 192.168.1.0 30 192.168.1.5
[r4]ip route-static 192.168.1.12 30 192.168.1.9
[r4]ip route-static 192.168.1.32 27 192.168.1.9
[r4]ip route-static 192.168.1.32 27 192.168.1.5
[r4]ip route-static 192.168.1.64 27 192.168.1.5
[r4]ip route-static 192.168.1.160 27 192.168.1.9
[r4]ip route-static 192.168.1.128 27 192.168.1.18
R5：
[r5]ip route-static 192.168.1.0 30 192.168.1.17
[r5]ip route-static 192.168.1.32 27 192.168.1.17
[r5]ip route-static 192.168.1.4 30 192.168.1.17
[r5]ip route-static 192.168.1.8 30 192.168.1.17
[r5]ip route-static 192.168.1.12 30 192.168.1.17
[r5]ip route-static 192.168.1.64 27 192.168.1.17
[r5]ip route-static 192.168.1.96 27 192.168.1.17
[r5]ip route-static 192.168.1.160 30 192.168.1.17
[r5]ip route-static 0.0.0.0 0 12.0.0.2
第五步进行nat配置和端口映射：
nat配置：
[r5]acl 2000
[r5-acl-basic-2000]ru
[r5-acl-basic-2000]rule pe
[r5-acl-basic-2000]rule permit s
[r5-acl-basic-2000]rule permit source 192.168.1.0 0.0.0.255
[r5-acl-basic-2000]int g0/0/1
[r5-GigabitEthernet0/0/1]nat outbound 2000
端口映射：
[r5-acl-basic-2000]int g0/0/1
[r5-GigabitEthernet0/0/1]nat s
[r5-GigabitEthernet0/0/1]nat server p
[r5-GigabitEthernet0/0/1]nat server protocol t
[r5-GigabitEthernet0/0/1]nat server protocol tcp g
[r5-GigabitEthernet0/0/1]nat server protocol tcp global cu
[r5-GigabitEthernet0/0/1]nat server protocol tcp global current-interface 23 i
[r5-GigabitEthernet0/0/1]nat server protocol tcp global current-interface 23 ins
ide 192.168.1.33 23
Warning:The port 23 is well-known port. If you continue it may cause function fa
ilure.
Are you sure to continue?[Y/N]:y
在R1上配置远程登陆：
[r1]aaa
[r1-aaa]local-user admin privilege level 15 password cipher 123
[r1-aaa]local-user admin service-type telnet
[r1]user-interface vty 0 4
[r1-ui-vty0-4]authentication-mode aaa