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If you are using both absolute and periodic commands in a time range, the periodic command qualifies the absolute time in the absolute command You can have multiple periodic commands in a time range Associating Time Ranges to ACL Statements Once you have created your time range, you then activate it by associating the time range to one or more ACL statements using the following syntax:
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ciscoasa(config)# access-list ACL_ID [extended] {deny | permit} ACL_parameters [time-range range_name]
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To add a time range to an existing ACL command, reenter the ACL command along with the time range parameters
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Once you have created your ACL, you need to activate it on an interface The following is the syntax of the access-group command that you need to use to activate your ACL:
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ciscoasa(config)# access-group ACL_ID {in | out} interface logical_if_name [per-user-override | control-plane]
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The ACL_ID specifies which ACL you are activating Before version 70, you could only activate an ACL inbound on an interface (in parameter) Starting in version 70, you can activate an ACL inbound (in as traffic enters the interface) and/or outbound (out before traffic leaves the interface) After the interface parameter, you need to specify the logical name of the interface where this ACL is to be activated To remove an ACL applied to an interface, precede the access-group command with the no parameter The per-user-override parameter is used with downloadable ACLs (discussed in 8) The control-plane parameter is used to restrict traffic to the appliance itself: the latter is new in version 80
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To list the statements in your ACL, you have two viewing choices First, the show run access-list and show run access-group commands display those respective commands in the running-config in RAM The downside of these commands is that they don t display any information about the operation of your ACL(s) on your appliance Your second option is the show access-list command:
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ciscoasa(config)# show access-list [ACL_ID]
If you don t specify a specific ACL, all ACLs are shown on the appliance Here s an example of the use of this command:
ciscoasa(config)# show access-list access-list cached ACL log flows: total 0, denied 0
6:
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(deny-flow-max 4096) alert-interval 300 access-list ACLOUT; 4 elements access-list ACLOUT line 1 extended permit tcp 192168100 2552552550 host 1921681111 eq www (hitcnt=4)0x954ebd70 access-list ACLOUT line 2 extended permit tcp host 1921681010 host 1921681111 eq ftp (hitcnt=1) 0x33490ecd access-list ACLOUT line 3 extended permit tcp any host 192168119 eq www (hitcnt=8) 0x83af39ba access-list ACLOUT line 4 extended deny ip any any (hitcnt=4) 0x2ca31385 <--output omitted-->
When displaying an ACL, you see the hit counts that show the matches on the statements (the hitcnt parameter) At the end of each ACL statement, you can also see a hexadecimal number, which is used to uniquely identify each entry in the ACL TIP At the end of every ACL on the appliance is an implicit deny statement this drops all traffic that is not matched on a previous statement This statement is invisible when you look at the ACL with a show access-list command Therefore, I recommend that you include a deny ip any any command at the end of every extended ACL so that you can see the hit count of dropped packets
ACL Maintenance
The following two sections will discuss how to insert statements into existing ACLs, delete statements from ACLs, and delete an entire ACL
Updating ACLs
Starting in version 63, the appliances support a feature called sequenced ACLs, where you can insert an ACL statement into an already existing ACL This is accomplished by using the line parameter in the access-list command:
ciscoasa(config)# access-list ACL_ID [extended] line line_# {deny | permit} ACL_parameters
When specifying a line number, use the number of the line where you want to insert this statement For example, if you want a new statement to be the third line in an ACL, use 3 as the line number If there is an existing line 3, it and the entries below it are pushed down in the ACL and are renumbered starting at 4 NOTE If you execute the show running-config command, ACL line numbers are not seen; nor are they saved in flash when you execute the write memory command However, you can see the line numbers with the show access-list command
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