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Variable Length Subnetting

This guide explains the principles of Variable Length Subnetting (VLSM) in designing a network for multiple locations, addressing specific user requirements in Perth (60 users), Kuala Lumpur (28 users), Sydney (12 users), and Singapore (12 users). It highlights the wastefulness of classful subnetting and emphasizes the importance of using VLSM for optimized addressing. By calculating subnet masks based on the largest requirements and ensuring proper tracking of addresses, the guide concludes with a practical example showcasing the effective allocation of a Class C address for the networking needs.

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Variable Length Subnetting

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  1. Jim Blanco Aparicio-Levy Technical Center Variable Length Subnetting

  2. VLSM allows us to use one class C address to design a networking scheme to meet the following requirements: • Perth 60 users • Kuala Lumpur 28 users • Sydney 12 users • Singapore 12 users • WAN links between each router Variable Length Subnetting

  3. Networking Requirements KL 60 WAN 2 WAN 2 WAN 2 Sydney 60 Sing. 60 Perth 60 • Classful subnetting is very wasteful. • In the example above, a /26 was used to provide the 60 addresses for Perth and the other LANs. There are no addresses left for WAN links

  4. Forget everything you learned about classfull subnetting. • Just remember you have 256 – 2 = 254 addresses to work with. VLSM

  5. VLSM List your network requirements in descending order.

  6. VLSM Calculate the subnet mask to meet largest requirement - Perth

  7. VLSM Keep track of subnet and broadcast addresses. Use the next available Address .64 to calculate a subnet mask for the next largest requirement - KL Lumpur.

  8. VLSM Sydney needs 12 addresses. Use the next available address .96 to calculate a subnet for Sydney’s requirement for 12

  9. VLSM Singapore also requires 12

  10. VLSM WAN links require 2 addresses each

  11. VLSM

  12. VLSM The networking problem is solved

  13. Networking Scheme KL 192.168.10.64/27 WAN 192.198.10.133 and 134 WAN 192.198.10.129 and 130 WAN 192.198.10.137 and 138 Sydney 192.168.10.96/28 Sing. 192.168.10.112/28 Perth 192.168.10.0/26 Apply the address to the LAN or WAN link

  14. A class C address such as 192.168.12.0 contains 256 - 2 = 254 usable addresses • You used only addresses .0 - .139 VLSM

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