Access List For Mac

Posted : admin On 2/1/2022

A media access control address (MAC address) is a unique identifier assigned to a network interface controller (NIC) for use as a network address in communications within a network segment. This use is common in most IEEE 802 networking technologies, including Ethernet, Wi-Fi, and Bluetooth.

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This chapter describes Layer 2 security basics and security features on switches available to combat network security threats. These threats result from weaknesses in Layer 2 of the OSI model—the data-link layer. Switches act as arbiters to forward and control all the data flowing across the network. The current trend is for network security to be solidified through the support of switch security features that build feature-rich, high-performance, and optimized networks. The chapter examines the integrated security features available on Cisco catalyst switches to mitigate threats that result from the weaknesses in Layer 2 of the OSI model. The chapter also provides guidelines and recommendations intended to help you understand and configure the Layer 2 security features available on Cisco switches to build robust networks.

An access control list (ACL) is implemented by assigning the list to an Ethernet interface or subinterface, to a port channel interface, or to the control plane. The switch assigns a default ACL to the control plane unless the configuration contains a valid control-plane ACL assignment statement. You could use a 48-bit extended MAC address access list. Here is an example: access-list 701 permit 000C.E66B.0DE7 0000.0000.0000. To apply the access list to an interface, type: interface ethernet 0. Access-expression input smac(701) Which platform are you using? AFAIK, MAC address filtering is not supported on the e.g. 800 Series routers. The Access Control List is made up of a series of entries. Each ACL is numbered, and all entries in the same list are equally numbered. By default, when you add entries to the list, the new entries appear at the bottom. The only exception is the implicit entry at the bottom of every list, which is a deny all. So the moment it's learned that a feature called “MAC Access-Lists” exists, it raises interest in many people. They assume that this might solve the dilemma of how to prevent Host-A from sending IP packets to Host-B when the IPv4 addresses of both hosts are unpredictable.

A summary of Layer 2 best practices is provided toward the end of the chapter.

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Securing Layer 2

With the rapid growth of IP networks in the past years, high-end switching has played one of the most fundamental and essential roles in moving data reliably, efficiently, and securely across networks. Cisco Catalyst switches are the leader in the switching market and major players in today's networks.

The data-link layer (Layer 2 of the OSI model) provides the functional and procedural means to transfer data between network entities with interoperability and interconnectivity to other layers, but from a security perspective, the data-link layer presents its own challenges. Network security is only as strong as the weakest link, and Layer 2 is no exception. Applying first-class security measures to the upper layers (Layers 3 and higher) does not benefit your network if Layer 2 is compromised. Cisco switches offer a wide range of security features at Layer 2 to protect the network traffic flow and the devices themselves.

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Understanding and preparing for network threats is important, and hardening Layer 2 is becoming imperative. Cisco is continuously raising the bar for security, and security feature availability at Layer 2 is no exception. The sections that follow highlight the Layer 2 security features available on Cisco Catalyst switches.