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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

Jim Blanco

Aparicio-Levy Technical Center

Variable Length Subnetting
variable length subnetting1

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
slide3

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
slide4

Forget everything you learned about classfull subnetting.

  • Just remember you have 256 – 2 = 254 addresses to work with.
VLSM
slide5
VLSM

List your network requirements in descending order.

slide6
VLSM

Calculate the subnet mask to meet largest requirement - Perth

slide7
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.

slide8
VLSM

Sydney needs 12 addresses. Use the next available address .96 to calculate

a subnet for Sydney’s requirement for 12

slide9
VLSM

Singapore also requires 12

slide10
VLSM

WAN links require 2 addresses each

slide12
VLSM

The networking problem is solved

slide13

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

slide14

A class C address such as 192.168.12.0 contains 256 - 2 = 254 usable addresses

  • You used only addresses .0 - .139
VLSM