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Year 2 - Chapter 6/Cisco 3 - Module 6 ACLs - page 27 / 40

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Extended ACLs – TCP Example

The first statement could have used the mnemonic “telnet” in place of 23 with exactly the same result. The one advantage to using the mnemonic is that it is more intuitive to anyone having to support the device.

Lab-X#config t

Lab-X(config)#access-list 101 deny tcp 192.168.5.0 0.0.0.255 any eq 23

Lab-X(config)#access-list 101 permit ip any any

Lab-X(config)#interface fastethernet 0/1

Lab-X(config-if)#ip access-group 101 in

If you want to block network 192.168.5.0 from being able to surf the Web while still allowing other services such as FTP, use this code:

Lab-X#config t

Lab-X(config)#access-list 106 deny tcp 192.168.5.0 0.0.0.255 any eq www

Lab-X(config)#access-list 106 permit ip any any

Lab-X(config)#interface ethernet 0

Lab-X(config-if)#ip access-group 106 in

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