We will be considering these access control lists, how they work and how to configure them on Cisco routers. Please have a look at Figure 1 below that we will use for all our configuration examples. The scenario consists of a single router R1 with two interfaces Fa0/0 and Fa0/1 connected to internal network and the Internet, respectively.

Jan 28, 2025 · These are examples of IP ACLs that can be configured in Cisco IOS Software: The command syntax format of a standard ACL is access-list access-list-number {permit|deny} {host|source source-wildcard|any}. Standard ACLs compare the source address of the IP packets to the addresses configured in the ACL in order to control traffic.

Mar 15, 2025 · Learn Cisco ACLs configuration commands with their arguments, options, and parameters. There are eight types of ACLs.

Nov 30, 2023 · Masks in order to configure IP addresses on interfaces start with 255 and have the large values on the left side, for example, IP address 10.165.202.129 with a 255.255.255.224 mask. Masks for IP ACLs are the reverse, for example, mask 0.0.0.255. This is sometimes called an inverse mask or a wildcard mask.

Mar 15, 2025 · Learn how to create and manage a standard access list through a packet tracer example. For this tutorial, I assume that you know what a standard ACL is and which commands are used to create and implement a standard ACL. To learn access lists from the beginning, you can check the previous parts of this tutorial.

Nov 16, 2020 · There are a variety of ACL types available that are configured based on security requirements. Cisco best practices for creating and applying ACLs: Order ACL with multiple statements from most specific to least specific. Maximum of two ACLs can be applied to a Cisco network interface.

For example, you could use ACLs to disallow HTTP traffic from a high-security network to the Internet. You could also use ACLs to allow HTTP traffic but only to specific sites, using the IP address of the site to identify it in an IP ACL. The Cisco Nexus 5000 Series switch supports IPv4, IPv6, and MAC ACLs for security traffic filtering.

Extended ACL can specify source IP and destination IP. 1. Create Extended ACL (Name,100-199) Router(config-ext-nacl)# deny tcp host 172.16.1.2 172.16.2.0 0.0.0.255 eq telnet. <- Deny From 172.16.1.2 To 172.16.2.0/24 Router(config-ext-nacl)# permit ip any any. Router(config-ext-nacl)# exit. Router(config)#ip access-list extended acl-test.

Feb 22, 2007 · These configuration examples use the most common IP ACLs. Note: Use the Command Lookup Tool ( registered customers only) to find more information on the commands used in this document. This figure shows a select host …

Nov 25, 2024 · We show you how to use access control list (ACL) to enforce IT security policies in your organization. An Access Control List (ACL) is a crucial security feature used in networking to define and manage the flow of traffic within a network.