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  • Access List example (Cisco)

    Design & Configure

    Access List example (Cisco)

    Technology: Network Security
    Area: ACL
    Vendor: Cisco
    Software: IOS 12.X , 15.X
    Platform: ISR, ASR, Catalyst Switches

    Access lists provides basic traffic filtering capabilities. Access lists can be configured for all routed network protocols to filter the packets of those protocols as the packets pass through a router or switch. The main rule is that access list is analyzed top down. First match applies and there is no need to check the rest ACEs (Access List Entries). At the end of ACL there is implicit deny statement.


    To configure access list e that denies telnet traffic and allows the rest traffic, use the following command:

    Router#configure terminal
    Router(config)#ip access-list extended 101
    Router(config-ext-nacl)#5 deny tcp any any eq telnet
    Router(config-ext-nacl)#10 permit ip any any
    Router#show access-list


    To verify access list configuration use:

    Extended IP access list 101
    5 deny tcp any any eq telnet
    10 permit ip any any

    Author: Marcin Bialy

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