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

Generation QR Code 2d barcode in Objective-C 22: Access Control Lists

22: Access Control Lists
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2202The CD contains a multimedia demonstration of configuring a standard numbered ACL to restrict telnet access on a router As you will see in the next section, you can also use extended ACLs to restrict access to the IOS device, but this configuration is much more complex Second, extended ACLs are applied to interfaces and thus won t be able to restrict telnet access from the router to a remote destination And third, whenever you apply an ACL to an interface on the router, you ll affect the performance of the router on that interface Depending on the router model, the IOS version, and the features you have enabled, the degradation in performance will vary (today s most current IOS versions take very little of a performance hit when using ACLs on interfaces) Therefore, if you only want to restrict telnet or SSH access to or from the router, using a standard ACL and the access-class statement on your VTYs is the best approach
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You can restrict telnet and SSH access to your IOS device by securing the VTYs by enabling login and requiring a password, plus applying a standard ACL to the VTY lines You need to apply them with
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the access-class Line Subcon guration mode command Note that you can also do this with an Extended ACL, but this requires more con guration on your part
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EXERCISE 22-1 Configuring Standard Numbered ACLs
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The last few sections dealt with the configuration of standard numbered ACLs This exercise will help you reinforce this material by letting you configure a standard numbered ACL on a router to restrict access through it You ll perform this lab using Boson s NetSim simulator You can find a picture of the network diagram for Boson s NetSim simulator in the Introduction of this book In this exercise, you ll first set up static routes on the two routers (2600-1 and 2600-2) and verify network connectivity Next, you ll configure your ACL After starting up the simulator, click the LabNavigator button Next, double-click Exercise 22-1 and click the
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Load Lab button This will load the lab configuration based on the exercises in s 11 and 16 1 On the 2600-2, configure a static route to 19216810/24, which is off of the 2600-1 View the routing table At the top of the simulator in the menu bar, click the eRouters icon and choose 2600-2 Configure the static route: configure terminal, ip route 19216810 2552552550 19216821, and end View the static route: show ip route Make sure that 19216810/24 shows up in the routing table as a static route (S) 2 On the 2600-1, configure a static route to 19216830/24, which is off of the 2600-2 View the routing table At the top of the simulator in the menu bar, click the eRouters icon and choose 2600-1 Configure the static route: configure terminal, ip route 19216830 2552552550 19216822, and end View the static route: show ip route Make sure that 19216830/24 shows up in the routing table as a static route (S) 3 From Host-3, test connectivity to the 2600-1 At the top of the simulator in the menu bar, click the eStations icon and choose Host3 Ping the serial0 and fa0/0 interface of the 2600-1 router: ping 19216821 and ping 19216811 The pings should be successful 4 From Host-3, test connectivity to Host-1 Ping Host-1: ping 192168110 The ping should be successful 5 Check network connectivity between the 2950-1 switch, the 2600-2 router, and the 2600-1 router At the top of the simulator in the menu bar, click the eSwitches icon and choose 2950-1 From the 2950-1 switch, ping the 2600-1 router: ping 19216811 At the top of the simulator in the menu bar, click the eRouters icon and choose 2600-2 From the 2600-2 router, ping the 2600-1 router: ping 19216811 At the top of the simulator in the menu bar, click the eRouters icon and choose 2600-1 From the 2600-1 router, ping the 2950-1 switch: ping 19216812 From the 2600-1 router, ping the 2600-2 router: ping 19216822
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