acl访问控制列表实验

实验拓扑图如上

1.配置IP地址R1与R3
  Loopback0=x.x.x.x/24
  IP=192.168.yx.x/24
2.用rip宣告，测通信

3. R1与R3配置VTY与特权口令cisco，测试能否TELNET

配置R1

R1(config)#int s0/3/0
R1(config-if)#clo rat 64000
R1(config-if)#ip add 192.168.21.1 255.255.255.0
R1(config-if)#no sh
R1(config-if)#exit
R1(config)#int l 0
R1(config-if)#ip add 1.1.1.1 255.255.255.0
R1(config-if)#exit
R1(config)#router rip
R1(config-router)#net 1.0.0.0
R1(config-router)#net 192.168.21.0

R1(config-router)#exit
R1(config)#ena pass cisco
R1(config)#line vty 0 4
R1(config-line)#pass cisco

R1#tel 3.3.3.3
Trying 3.3.3.3 ...

User Access Verification

Password:
R3>en（R1telnetR3成功）
Password:
R3#

配置R2

R2(config)#int s0/3/1
R2(config-if)#cl ra 64000
R2(config-if)#no sh
R2(config-if)#ip add 192.168.32.2 255.255.255.0
R2(config-if)#int s0/3/0
R2(config-if)#no sh
R2(config-if)#ip add 192.168.21.2 255.255.255.0
R2(config-if)#exit
R2(config)#router rip
R2(config-router)#net 192.168.21.0
R2(config-router)#net 192.168.32.0

配置R3

R3(config)#int s0/3/0
R3(config-if)#no sh

%LINK-5-CHANGED: Interface Serial0/3/0, changed state to up
R3(config-if)#
R3(config-if)#
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/3/0, changed state to up
R3(config-if)#ip add 192.168.32.3 255.255.255.0
R3(config-if)#int l 0

%LINK-5-CHANGED: Interface Loopback0, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback0, changed state to up
R3(config-if)#
R3(config-if)# ip add 3.3.3.3 255.255.255.0
R3(config-if)#exit
R3(config)#router rip
R3(config-router)#net 192.168.32.0
R3(config-router)#net 3.0.0.0

R3(config)#ena pass cisco
R3(config)#line vty 0 4
R3(config-line)#pass cisco
R3(config-line)#

4.禁止R2访问R1:(R3能否PING通R1的s0//3/0.反之)

　　查看通信
　　清除路由表信息或邻居
　　R1--pingR2/R3，查看连通,为什么PIng不通（刚开始能够ping通，因为路由表没有更新，清理路由表之后ping不通因为acl）

在R1上面配置

R1(config)#access-list 1 deny 192.168.21.2
R1(config)#access-list 1 deny 192.168.32.2
R1(config)#access-list 1 per any
R1(config)#int s0/3/0
R1(config-if)#ip acc
R1(config-if)#ip access-group 1 in
R1(config-if)#exi
R1(config)#exi

R1#sh ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
       i - IS-IS, 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, Loopback0
R    3.0.0.0/8 [120/2] via 192.168.21.2, 00:00:35, Serial0/3/0
C    192.168.21.0/24 is directly connected, Serial0/3/0
R    192.168.32.0/24 [120/1] via 192.168.21.2, 00:00:35, Serial0/3/0
R1#clear ip route *
R1#sh ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
       i - IS-IS, 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, Loopback0
C    192.168.21.0/24 is directly connected, Serial0/3/0
R3#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 = 62/62/63 ms

R3#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 0 percent (0/5

5.(删除前ACL配置）禁止R1 telnet R3使用扩展, R3配置
R1#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
R1(config)#no acc
R1(config)#no access-list 1

R3(config)#access-list 101 deny tcp host 1.1.1.1 host 192.168.32.3 eq 23
R3(config)#acc 101 deny tcp ho 192.168.21.1 ho 192.168.32.3 ea 23
                                                             ^
% Invalid input detected at '^' marker.
 
R3(config)#acc 101 deny tcp ho 192.168.21.1 ho 192.168.32.3 eq 23
R3(config)#acc 101 per ip any any
R3(config)#int s0/3/0
R3(config-if)#ip acc
R3(config-if)#ip access-group 101 in

R1#tel 192.168.32.3
Trying 192.168.32.3 ...

% Connection timed out; remote host not responding

 

转载于:https://blog.51cto.com/xiangxin/545049

来源：CSDN

作者：weixin_33816946

链接：https://blog.csdn.net/weixin_33816946/article/details/91739777