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Mac Filtering

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1. MAC Filtering Presented Devang Doshi on: Sep 17, 2015 2. Index ã MAC ã MAC Address ã MAC Filtering 3. MAC ã MAC stands for Media Access Control ã In the 7…
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  • 1. MAC Filtering Presented Devang Doshi on: Sep 17, 2015
  • 2. Index • MAC • MAC Address • MAC Filtering
  • 3. MAC • MAC stands for Media Access Control • In the 7 layer OSI model for computer networking, Layer Data Unit Host Layers 7. Application Data6. Presentation 5. Session 4. Transport Segments Media Layers 3. Network Packet/Datagram 2. Data link Bit/Frame 1. Physical Bit Media Access Control (MAC) sub-layer responsible for controlling how devices in a network gain access to data and permission to transmit it. Logical Link Control (LLC) sub-layer controls error checking and packet synchronization.
  • 4. MAC Address • A unique identifier assigned to network interfaces (for communications on the physical network segment) • Network address for most IEEE 802 network technologies (including Ethernet and WiFi) • Most often assigned by the manufacturer • Stored in hardware (on card's read-only memory or some other firmware mechanism) Image source: https://en.wikipedia.org/wiki/MAC_address#/media/File:MAC-48_Address.svg
  • 5. What is MAC Filtering? • Definition, as per wikipedia, “In computer networking, MAC Filtering refers to a security access control method whereby the 48-bit address assigned to each network card is used to determine access to the network. “ • Definition, as per TechNet, “MAC address filtering is a feature for IPv4 addresses that allows you to include or exclude computers and devices based on their MAC address” MAC Filtering = GUI Filtering = Layer 2 Filtering = Link-layer Filtering
  • 6. How to implement MAC Filtering? • When configuring MAC address filtering, you can specify the hardware types that are exempted from filtering (By default, all hardware types defined in RFC 1700 are exempted from filtering) • Before configuring MAC address filtering, • Enable and define an explicit allow and deny list (for DHCP to function smoothly) • Enable and define an allow list and a block list (the block list has precedence over the allow list)
  • 7. How to implement MAC Filtering? • Four step process to enable MAC address filtering on Windows Computer: 1. In the DHCP console, double-click the IPv4 node, and then double- click the Filters node 2. Right-click Allow or Deny as appropriate for the type of filter you are creating, and then click New Filter 3. Enter the MAC address to filter, and then enter a comment in the Description field if you want to. Click Add. Repeat this step to add other filters 4. Click Close when you have finished
  • 8. Summary Unique address for each card, can’t be changed* Blacklists and Whitelists Devices not Users Effective in wired networks Not effective on wireless networks Used on Enterprise Networking
  • 9. Reference: Websites • https://en.wikipedia.org/wiki/MAC_filtering • https://en.wikipedia.org/wiki/MAC_address • https://en.wikipedia.org/wiki/OSI_models • https://en.wikipedia.org/wiki/Media_access_control • https://technet.microsoft.com/en-us/magazine/ff521761.aspx
  • 10. Questions?
  • 11. Thank you for your time
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