Cisco 2950G 24 Software Configuration Guide - Page 517
Numbered ACL Examples, Extended ACL Examples, Named ACL Example, Commented IP ACL Entry Examples - end of life
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Chapter 25 Configuring Network Security with ACLs Examples for Compiling ACLs Numbered ACL Examples This example shows that the switch accepts addresses on network 36.0.0.0 subnets and denies all packets coming from 56.0.0.0 subnets. The ACL is then applied to packets entering Gigabit Ethernet interface 0/1. Switch(config)# access-list 2 permit 36.0.0.0 0.255.255.255 Switch(config)# access-list 2 deny 56.0.0.0 0.255.255.255 Switch(config)# interface gigabitethernet0/1 Switch(config-if)# ip access-group 2 in Extended ACL Examples In this example of using an extended ACL, you have a network connected to the Internet, and you want any host on the network to be able to form TCP Telnet and SMTP connections to any host on the Internet. Switch(config)# access-list 102 permit tcp any 128.88.0.0 0.0.255.255 eq 23 Switch(config)# access-list 102 permit tcp any 128.88.0.0 0.0.255.255 eq 25 Switch(config)# interface gigabitethernet0/1 Switch(config-if)# ip access-group 102 in SMTP uses TCP port 25 on one end of the connection and a random port number on the other end. The same port numbers are used throughout the life of the connection. Mail packets coming in from the Internet have a destination port of 25. Because the secure system behind the switch always accepts mail connections on port 25, the incoming services are controlled. Named ACL Example The Marketing_group ACL allows any TCP Telnet traffic to the destination address and wildcard 171.69.0.0 0.0.255.255 and denies any other TCP traffic. It permits any other IP traffic. Switch(config)# ip access-list extended marketing_group Switch(config-ext-nacl)# permit tcp any 171.69.0.0 0.0.255.255 eq telnet Switch(config-ext-nacl)# deny tcp any any Switch(config-ext-nacl)# permit ip any any The ACLs are applied to permit Gigabit Ethernet port 0/1, which is configured as a Layer 2 port, with the Marketing_group ACL applied to incoming traffic. Switch(config)# interface gigabitethernet0/1 Switch(config-if)# ip access-group marketing_group in ... Commented IP ACL Entry Examples In this example of a numbered ACL, the workstation belonging to Jones is allowed access, and the workstation belonging to Smith is not allowed access: Switch(config)# access-list 1 remark Permit only Jones workstation through Switch(config)# access-list 1 permit 171.69.2.88 Switch(config)# access-list 1 remark Do not allow Smith workstation through Switch(config)# access-list 1 deny 171.69.3.13 78-14982-01 Catalyst 2950 Desktop Switch Software Configuration Guide 25-25
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