R3#show ip route

Gateway of last resort is not set

10.0.0.0/24 is subnetted, 1 subnets

D 10.1.1.0 [90/21026560] via 23.23.23.2, 00:51:11, Serial1/1

12.0.0.0/24 is subnetted, 1 subnets

D 12.12.12.0 [90/21024000] via 23.23.23.2, 00:51:16, Serial1/1

23.0.0.0/24 is subnetted, 1 subnets

C 23.23.23.0 is directly connected, Serial1/1

172.16.0.0/24 is subnetted, 1 subnets

D 172.16.1.0 [90/20514560] via 23.23.23.2, 00:51:16, Serial1/1

C 192.168.1.0/24 is directly connected, FastEthernet0/0

二、在R1配置ACL

1. 配置

R1(config)#access-list 101 deny tcp 10.1.1.0 0.0.0.255 host 192.168.1.100 eq 80

R1(config)#access-list 101 deny icmp 10.1.1.0 0.0.0.255 any

R1(config)#access-list 101 permit ip any any

R1(config)#int f0/0

R1(config)#ip access-group 101 in

2. 认证

R1#show access-list

Extended IP access list 101

deny tcp 10.1.1.0 0.0.0.255 host 192.168.1.100 eq www

deny icmp 10.1.1.0 0.0.0.255 any

permit ip any any

R1#show ip interface

FastEthernet0/0 is up, line protocol is up (connected)

Internet address is 10.1.1.1/24

Broadcast address is 255.255.255.255

Address determined by setup command

MTU is 1500 bytes

Helper address is not set

Directed broadcast forwarding is disabled

Outgoing access list is not set

Inbound access list is 101

……