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Variable Length Subnetting

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

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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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