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

Generate QR Code in Objective-C 22: Access Control Lists

22: Access Control Lists
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Be very familiar with the syntax of a standard ACL, as well as the fact that it can lter only on source addresses in
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a packet If you omit the wildcard mask in a standard ACL, it defaults to 0000 (an exact match is required)
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Following this is the optional log parameter, which is new to standard ACLs in IOS 120 This parameter will cause any match of this statement to be printed to the console port of the router These messages, by default, will not appear on a nonconsole connection to the IOS device unless you execute the following:
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Router# terminal monitor
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The terminal monitor command is good only for your current session: when you log out and then log back into the IOS device, you ll need to reexecute it to see logging output on your VTY or TTY session You can also forward these ACL logging messages to a syslog server This setup is useful for debugging and security purposes Once you have created your ACL, you can proceed to activate it on an interface with the ip access-group ACL_# in|out command
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Standard IP ACL Examples
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Now that you have been introduced to the two basic commands to create and activate a standard numbered IP ACL, let s look at some examples to help you further your understanding Here s the first example:
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Router(config)# access-list 1 permit 19216811 Router(config)# access-list 1 deny 19216812 Router(config)# access-list 1 permit 19216810 000255 Router(config)# access-list 1 deny any Router(config)# interface serial 0 Router(config-if)# ip access-group 1 in
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In this example, the first ACL statement in ACL #1 says that in order to execute the permit action, the IP packet must have a source address of 19216811 if it doesn t, the IOS proceeds to the second statement Remember that if you omit
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ACL Types
the wildcard mask on a standard ACL, it defaults to 0000 an exact match of the corresponding address in the ACL statement The second ACL statement says that in order to execute the deny action, the IP packet must have a source address of 19216812; if it doesn t, the IOS proceeds to the third statement The third ACL statement says that in order to execute the permit action, the IP packet must have a source address between 19216810 and 1921681255 if it doesn t, the IOS proceeds to the fourth statement The fourth statement is actually not necessary: it drops any packet You don t need this statement since an invisible implicit deny any statement occurs at the end of every ACL The last two commands in the ACL example activate ACL #1 on serial0 as traffic comes into the interface Actually, you could have written the preceding ACL like this:
Router(config)# access-list 1 deny 19216812 Router(config)# access-list 1 permit 19216810 000255 Router(config)# interface serial 0 Router(config-if)# ip access-group 1 in
This example reduces your configuration from four ACL statements in the list down to two
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2201The CD contains a multimedia demonstration of configuring a standard numbered ACL on a router Here s another example of a standard ACL:
Router(config)# access-list 2 deny 19216810 Router(config)# access-list 2 deny 1721600 Router(config)# access-list 2 permit 19216811 Router(config)# access-list 2 permit 0000 255255255255 Router(config)# interface ethernet 0 Router(config-if)# ip access-group 1 out
This ACL example has a few problems Examine it and see if you can spot them The first ACL statement appears to deny all traffic from 19216810/24 In reality, it will accomplish nothing Remember that if you omit the wildcard mask for the address, it defaults to 0000 an exact match The problem is that you ll never have a packet with a source address of 19216810, since this is a network number, and not a host address The second statement has the same problem The third and fourth statements are okay
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