qr code c# tutorial 22: Access Control Lists in Objective-C

Encoder Quick Response Code in Objective-C 22: Access Control Lists

22: Access Control Lists
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Router# show ip access-list 100
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2207The CD contains a multimedia demonstration of using the show [ip] access-list command on a router to verify the activation of your ACLs
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Use the show ip interfaces command to see whether or not an IP ACL is applied to your router s interfaces Use the show access-lists
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command to view all of the ACLs on your routerThe show ip access-list lists only the IP ACLs on your router
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Prior to the addition of the sequenced ACL feature, you basically had to make ACL changes in an external text editor such as Windows Notepad, delete the old ACL on the router, and paste in the new commands However, starting in IOS 123, you can edit ACLs on your IOS device on the fly with the sequenced ACL feature Sequenced ACLs allow you to insert and delete statements and remarks in an existing ACL With sequenced ACLs, each ACL command is given a unique sequence number By default, the sequence numbers start at 10 and increment by 10 You know that your IOS device supports sequenced ACLs if you display them with the show access-lists command and you see sequence numbers in front of the ACL statements:
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Router# show access-list Extended IP access list 101 10 permit ip host 19216810169 any 20 permit ip host 19216810189 any
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As you can see from this example, ACL 101 is using sequenced ACLs The sequence numbers are added when the router boots up and loads the ACL or when you add or change the ACL from the CLI or SDM Whenever you save the IOS s configuration to NVRAM, the sequence numbers are not stored with the ACL statements: Cisco implemented this feature for backward compatibility with older IOS versions that do not support sequenced ACLs Sequenced ACLs work with both named and numbered ACLs; however, to edit a numbered ACL, you must treat it as though it were a named ACL Once you enter the ACL subcommand mode, you can delete an entry by prefacing the sequence number with the no command:
Router(config)# ip access-list {standard|extended} ACL_name_or_# Router(config-{std|ext}-nacl)# no sequence_#
To insert a statement in an ACL, enter the ACL subcommand mode and preference the ACL statement with a sequence number that does not currently exist in the list of statements, like this:
Router(config)# ip access-list {standard|extended} ACL_name_or_# Router(config-{std|ext}-nacl)# sequence_# {permit|deny} ACL_condition
Since sequence numbers increment by 10, if you need to insert more than nine statements in the same place in your ACL, you ll first need to resequence the entries in the list:
Router(config)# ip access-list resequence ACL_name_or_number starting_seq_# increment
With this command, you need to specify the initial sequence number, and then the increment In the following example, the initial sequence number is 100 and the increment is 100:
Router (config)# ip access-list resequence 101 100 100 Extended IP access list 101 100 permit ip host 19216810169 any 200 permit ip host 19216810189 any
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22: Access Control Lists
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ACL Placement
This section covers design issues with ACLs that is, where you should place ACLs of a given type (standard or extended) In other words, given the source and destination that you are filtering, on what router and what interface on that router should you activate your ACL This section covers some of the important points you should consider when determining where to put your ACLs First, don t go crazy with ACLs and create dozens and dozens of them across all of your routers This makes testing and troubleshooting your filtering rules almost impossible In a campus network, for example, ACL configuration and filtering is on the layer 3 switch or router at the distribution layer that connects a building or floor to the campus backbone This model was discussed in 14: the core, distribution, and access layers The second point is that you will want to limit the number of statements in your ACL An ACL with hundreds of statements is almost impossible to test and troubleshoot It s not unusual to see an ACL have a lot of unnecessary and overlapping commands that have been carried over from years past As to where you should place your ACLs, the following two rules hold true in most situations:
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