Cisco CCNA Study Guide - Router Alley

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CCNA Study Guide v2.62 – Aaron Balchunas 266 Named Access Lists Named access lists provide us with two advantages over numbered access lists. First, we can apply an identifiable name to an access list, for documentation purposes. Second, we can remove individual lines in a named access-list, which is not possible with numbered access lists. Please note, though we can remove individual lines in a named access list, we cannot insert individual lines into that named access list. New entries are always placed at the bottom of a named access list. To create a standard named access list, the syntax would be as follows: Router(config)# ip access-list standard NAME Router(config-std-nacl)# deny 172.18.0.0 0.0.255.255 Router(config-std-nacl)# permit any To create an extended named access list, the syntax would be as follows: Router(config)# ip access-list extended NAME Router(config-ext-nacl)# permit tcp 172.18.0.0 0.0.255.255 host 172.16.10.10 eq 80 Router(config-ext-nacl)# deny ip 172.18.0.0 0.0.255.255 172.16.0.0 0.0.255.255 Router(config-ext-nacl)# permit ip any any Notice that the actual configuration of the named access-list is performed in a separate router “mode”: Router(config-std-nacl)# Router(config-ext-nacl)# * * * All original material copyright © 2013 by Aaron Balchunas (aaron@routeralley.com), unless otherwise noted. All other material copyright © of their respective owners. This material may be copied and used freely, but may not be altered or sold without the expressed written consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com.
CCNA Study Guide v2.62 – Aaron Balchunas 267 Time-Based Access-Lists Beginning with IOS version 12.0, access-lists can be based on the time and the day of the week. The first step to creating a time-based access-list, is to create a time-range: Router(config)# time-range BLOCKHTTP The above command creates a time-range named BLOCKHTTP. Next, we must either specify an absolute time, or a periodic time: Router(config)# time-range BLOCKHTTP Router(config-time-range)# absolute start 08:00 23 May 2006 end 20:00 26 May 2006 Router(config)# time-range BLOCKHTTP Router(config-time-range)# periodic weekdays 18:00 to 23:00 Notice the use of military time. The first time-range sets an absolute time that will start from May 23, 2006 at 8:00 a.m., and will end on May 26, 2006 at 8:00 p.m. The second time-range sets a periodic time that is always in effect on weekdays from 6:00 p.m. to 11:00 p.m. Only one absolute time statement is allowed per time-range, but multiple periodic time statements are allowed. After we establish our time-range, we must reference it in an access-list: Router(config)# access-list 102 deny any any eq 80 time-range BLOCKHTTP Router(config)# access-list 102 permit ip any any Notice the time-range argument at the end of the access-list line. This will result in HTTP traffic being blocked, but only during the time specified in the time-range. Source: (http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120t/120t1/timerang.htm) * * * All original material copyright © 2013 by Aaron Balchunas (aaron@routeralley.com), unless otherwise noted. All other material copyright © of their respective owners. This material may be copied and used freely, but may not be altered or sold without the expressed written consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com.
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