qr code c# tutorial depending on whether the ACL is standard or extended in Objective-C

Encoder QR Code in Objective-C depending on whether the ACL is standard or extended

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ACL Types
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Example of a Named Access List
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This example converts the extended IP numbered ACL from the Extended IP ACL Example section earlier in this chapter to a named ACL:
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Router(config)# ip access-list extended do_not_enter Router(config-ext-acl)# permit tcp any 1721600 00255255 established log Router(config-ext-acl)# permit udp any host 1721611 eq dns log Router(config-ext-acl)# permit tcp 1721700 00255255 host 1761612 eq telnet log Router(config-ext-acl)# permit icmp any 1761600 00255255 echo-reply log Router(config-ext-acl)# deny ip any any log Router(config)# interface ethernet 0 Router(config-if)# ip access-group do_not_enter in
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Both this example and the numbered example do the exact same thing Therefore, it is a matter of personal preference whether you use a named or numbered ACL (My preference is to use numbered ACLs, if only because I ve been using them since they first came out in IOS version 7)
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2205The CD contains a multimedia demonstration of configuring a named IP ACL on a router
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ACL Remarks
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Starting in IOS 120(2)T, you can embed remarks or comments within your ACL statements Remarks work with named or numbered ACLs Here s the configuration, based on whether you re using a numbered or named ACL:
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Router(config)# access-list ACL_# remark remark
Router(config)# ip access-list standard|extended ACL_name Router(config-{std|ext}-acl)# remark remark
The remark can be up to 100 characters in length Go ahead and use copious remarks in your ACLs, since some ACLs can have thousands of statements in them! Without the remark feature, you would have an almost impossible task of determining what a statement or group of statements was doing when confronted with so many ACL entries
22: Access Control Lists
Access List Veri cation
Once you have created and activated your ACLs, you can verify their configuration and operation with various show commands One common command that you can use is the Privilege EXEC show running-config command, which will display your ACL and the interface or interfaces on which it is activated However, you can use many other commands as well If you simply want to see which ACLs are activated on your router s interfaces, you can use the show ip interfaces command:
Router# show ip interfaces Ethernet0 is up, line protocol is up Internet address is 1721611/24 Broadcast address is 255255255255 Address determined by setup command MTU is 1500 bytes Helper address is not set Directed broadcast forwarding is disabled Outgoing access list is not set Inbound access list is 100 Proxy ARP is enabled
From the output of this command, you can see that ACL 100, an extended numbered IP ACL, is applied inbound on ethernet0
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2206The CD contains a multimedia demonstration of using the show ip interfaces command on a router to verify the activation of your ACLs To view the statements in your ACLs, use either of the following two commands:
Router# show access-lists [ACL_#_or_name] Router# show ip access-list [ACL_#_or_name]
Here is an example of the show access-lists command:
Router# show access-lists Extended IP access list 100 permit tcp 1721600 00255255 any established (189 matches)
ACL Types
permit udp host 17216139 any eq domain (32 matches) permit icmp host 1991991991 any IPX sap access list 1000 deny FFFFFFFF 7 permit FFFFFFFF 0
First, notice that the router keeps track of matches on each statement The first statement in ACL 100 has had 189 matches against it It is recommended that you put a deny ip any any command at the end of an extended ACL, even though the implicit deny statement will drop the traffic By putting this statement at the end of your ACL, you can see the hit counts of all the denied traffic: since the implicit deny command is invisible, you can t see the hit counts for it You can clear these counters with this command:
Router# clear access-list counters [ACL_#_or_name]
Also notice that using the show access-lists command displays all ACLs from all protocols on your router From the preceding output, two ACLs are shown: an extended numbered IP ACL and an IPX SAP ACL If you want to view only ACLs for IP, use the following command:
Router# show ip access-list Extended IP access list 100 permit tcp 1721600 00255255 any established (189 matches) permit udp host 17216139 any eq domain (32 matches) permit icmp host 1991991991 any
If you want to view only a particular ACL, use either of the following two commands:
Router# show access-lists 100 Extended IP access list 100 permit tcp 1721600 00255255 any established (189 matches) permit udp host 17216139 any eq domain (32 matches) permit icmp host 1991991991 any
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