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

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

22: Access Control Lists
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6 Configure a standard numbered ACL on the 2600-1 to allow traffic from the 2950-1 switch, but to deny all other traffic At the top of the simulator in the menu bar, click the eRouters icon and choose 2600-1 On the 2600-1, create a standard ACL statement to permit access from the 2950-1 switch, logging matches: configure terminal and access-list 1 permit host 19216812 Create a second ACL statement to deny all traffic, logging matches: access-list 1 deny any Exit configuration mode: end Examine the ACL configuration: show access-lists 7 Activate the ACL on the 2600-1 router on fa0/0 in the inbound direction Access the interface: interface fa0/0 Apply the ACL: ip accessgroup 1 in Exit configuration mode: end 8 Access the 2950-1 and verify its IP address configuration At the top of the simulator in the menu bar, click the eSwitches icon and choose 2950-1 View the IP address for VLAN 1: show ip interface brief 9 Test the ACL from the 2950-1 by pinging 19216811 From the 2950-1 switch, ping the 2600-1: ping 19216811 The ping should be successful 10 Examine the ACL statement matches on the 2600-1 At the top of the simulator in the menu bar, click the eRouters icon and choose 2600-1, and then use the show access-lists command to examine the ACL configuration There should be five matches on the permit statement 11 Test the ACL from the 2950-2 by pinging 19216811 At the top of the simulator in the menu bar, click the eSwitches icon and choose 2950-2 From the 2950-2 switch, ping the 2600-1: ping 19216811 The ping should fail 12 Examine the ACL statement matches on the 2600-1 At the top of the simulator in the menu bar, click the eRouters icon and choose 2600-1 and then use show access-lists to examine the ACL configuration There should be five matches on the deny statement 13 Remove the ACL configuration from the interface
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ACL Types
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At the top of the simulator in the menu bar, click the eRouters icon and choose 2600-1 On the 2600-1 router, remove the application of the ACL Go into the interface: configure terminal and interface fa0/0 Deactivate the ACL: no ip access-group 1 in Go back to Global Configuration mode: exit 14 Remove ACL 1 from the configuration Delete the ACL statements: no access-list 1 Exit configuration mode: end Use the show access-list command to verify the ACL no longer exists 15 Test connectivity from both switches 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: ping 19216811 At the top of the simulator in the menu bar, click the eSwitches icon and choose 2950-2 The ping should be successful From the 2950-2 switch, ping the 2600-1: ping 19216811 Both pings should also be successful Now you should be more comfortable with configuring standard numbered ACLs on a router
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Extended Numbered ACLs
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Extended IP ACLs are much more flexible in what you can match on than standard ACLs Extended ACLs can match on all of the following information:
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Source and destination IP addresses TCP/IP protocol (IP, TCP, UDP, ICMP, and so on) Protocol information, such as port numbers for TCP and UDP, or message
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types for ICMP The following sections cover the configuration and use of extended numbered IP ACLs
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Extended IP ACLs can lter on source and destination IP addresses, TCP/IP protocols, and protocol information
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such as ICMP messages and TCP/UDP source and destination port numbers
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22: Access Control Lists
Command Syntax
Here is the generic command to configure an extended numbered IP ACL:
Router(config)# access-list 100-199|2000-2699 permit|deny IP_protocol source_address source_wildcard_mask [protocol_information] destination_address destination_wildcard_mask [protocol_information] [log]
As you can see from this command, the configuration of an extended ACL is more complicated than that of a standard one Extended IP numbered ACLs can use list numbers in the ranges 100 199 and 2000 2699 After the action (permit or deny) comes the IP protocol that you want to match on This is the first major difference between an extended ACL and a standard one These IP protocols include the following: ip, icmp, tcp, gre, udp, igrp, eigrp, igmp, ipinip, nos, and ospf If you want to match on any IP protocol TCP, UDP, ICMP, and so on use the ip keyword for the protocol If Cisco doesn t have a name for the IP protocol you want to specify, use the number of the protocol instead, such as 6 for TCP The second major difference is that you must specify both the source and destination addresses and their respective wildcard masks With a standard ACL, you can specify only the source address, and the wildcard mask is optional Depending on the IP protocol, you might be able to add protocol information for the source and/or destination For example, TCP and UDP allow you to specify both source and destination port numbers, and ICMP allows you to specify ICMP message types As with standard ACLs, you can log messages to the console or a syslog server with the log parameter Once you have created your extended numbered IP ACL, you must activate it on your router s interface with the ip access-group command Note that this is the same configuration used with a standard ACL Once you activate the ACL, the router will begin filtering traffic on the interface
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