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How to configure Standard ACL in Cisco Router

Thursday, August 18, 2016


ACL(Access Control List) is to secure your network by setting some rules on Cisco Routers. Here in ACL you can allow or deny the access of any network or a particular host. ACL has two types Standard ACL and Extended ACL. Here in this article we will start from Standard ACL and then will move to Extended. Let see the configuration of the Standard ACL .


Take one scenario or a network topology where we can implement Standard ACL.




In this Scenario we are going to block access of 10.0.0.2 so that this host should not communicate with Server. We will do configuration on the router 2 which is connected to Server. Lest do configuration of Standard ACL...

Router2(config)#access-list 10 deny host 10.0.0.2
Router2(config)#access-list 10 permit any

After creating this ACL we need to apply them on inbound and outbound interfaces..

Router2(config)#int fa0/1
Router2(config-if)#ip access-group 10 in
Router2(config-if)#exit
These are the only command by which you can block this particular host to ping that server. Now your server is secure which is only accessible by 10.0.0.3. 

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