Private vs Public Network

• Private Network: Network which cannot be accesed directly from internet
• Public Network: Network which can be accessed from internet
• Private network cidr ranges
  • 10.0.0.0/8: 10.0.0.0 to 10.255.255.255
  • 172.16.0.0/12: 172.16.0.0 to 172.31.255.255
  • 192.168.0.0/16: 192.168.0.0 to 192.168.255.255

Subnets

• Subnet (sub networks) are parts of larger network

Consider you need to create network with subnets for the following

A Building with 4 floors

• overview
  
• Each floor requires 50 devices

each floor ~= 50
2^n ~= 50
n = 6
N = 32-6 = 26

building ~= 50 * 4 = 200
2^n ~= 200
n = 8
N = 24

10.0.0.0/8
172.16.0.0/12
192.168.0.0/16

building network: 192.168.0.0/24

BD SM: 11111111.11111111.11111111.00000000
FL SM: 11111111.11111111.11111111.11000000
----------------------------------------------
                                  .xx000000
                                  .00000000 => 192.168.0.0/26
                                  .01000000 => 192.168.0.64/26
                                  .10000000 => 192.168.0.128/26
                                  .11000000 => 192.168.0.192/26

• Each device requires 100 devices

each floor ~= 100
2^n ~= 100
n = 7
N = 25

building ~= 400
2^n ~= 400
n = 9
N = 23

10.0.0.0/8
172.16.0.0/12
192.168.0.0/16

172.16.0.0/23

BD SM: 11111111.11111111.11111110.00000000
FL SM: 11111111.11111111.11111111.10000000

----------------------------------------------
                                x.x0000000
                                0.00000000 => 172.16.0.0/25
                                0.10000000 => 172.16.0.128/25
                                1.00000000 => 172.16.1.0/25
                                1.10000000 => 172.16.1.128/25

• Each floor requires 30,000 devices

each floor ~= 30000
2^n ~= 30000
n = 15
N = 17

building ~= 120000
2^n ~= 120000
n = 17
N = 15

10.0.0.0/8
172.16.0.0/12

building: 10.0.0.0/15

BD SM: 11111111.11111110.00000000.00000000
FL SM: 11111111.11111111.10000000.00000000
  --------------------------------------------
                       x.x
                       0.00000000  => 10.0.0.0/17
                       0.10000000  => 10.0.128.0/17
                       1.00000000  => 10.1.0.0/17
                       1.10000000  => 10.1.128.0/17

Building with 8 floors

• Each floor requires 100 devices

each floor ~= 100
2^n ~= 100
n = 7
N = 25

building ~= 800
2^n ~= 800
n = 10
N = 22

10.0.0.0/8
172.16.0.0/12
192.168.0.0/16

bd: 192.168.0.0/22

BD SM: 11111111.11111111.11111100.00000000
FL SM: 11111111.11111111.11111111.10000000
--------------------------------------------
                               xx.x
                               00.00000000 => 192.168.0.0/25
                               00.10000000 => 192.168.0.128/25
                               01.00000000 => 192.168.1.0/25
                               01.10000000 => 192.168.1.128/25
                               10.00000000 => 192.168.2.0/25
                               10.10000000 => 192.168.2.128/25
                               11.00000000 => 192.168.3.0/25
                               11.10000000 => 192.168.3.128/25

• Exercise:
  • Each floor has 30,000 devices
  • Each floor has 50 devices