Kali ini saya akan menjelaskan tentang cara untuk menghitung ip yang di perlukan dalam 1 cakupan jaringan network dengan menggunakan teknik vlsm. teknik vlsm di gunakan untuk menghemat ip yg di butuhkan dalam suatu jaringan tertentu agar jaringan lebih aman dari serangan dari luar.
berikut adalah contoh perhitungan menggunakan teknik vlsm :
1. VLSM
Ruang
marketing à 30 Komputer 30+3=33
Ruang personalia à 13 Komputer 13+3=16
Ruang staff umum à 100 Komputer 100+3=103
Ip default 192.168.5.0
Ø
Ruang staff umum
2n >=103
27 >=103
32-7=/25
255.255.255.128
192.168.5.0
à net id
192.168.5.1
à gateway
192.168.5.2
à host awal
192.168.5.126
à host akhir
192.168.5.127
à broadcast ip
Ø
Ruang marketing
2n
>= 33
26
>= 33
32-6
= /26
255.255.255.192
192.168.5.128
à net id
192.168.5.129
à gateway
192.168.5.130
à host awal
192.168.5.190
à host akhir
192.168.5.191
à broadcast ip
Ø
Ruang personalia
2n
>= 16
24
>= 16
32-4
= /28
255.255.255.240
192.168.5.192
à net id
192.168.5.193
à gateway
192.168.5.194
à host awal
192.168.5.206
à host akhir
192.168.5.207 Ã broadcast ip
192.168.5.208
à IP untuk blok/ruang berikutnya
2. Subnetting
Hitung dengan teknik Subnetting untuk ip
Ø
IP Default Class A
: 10.0.0.0/12
Ø
Subnet Mask :
255.240.0.0
Ø
Jumlah Subnet : 24
= 16
Ø
Jumlah Host : 220
– 2 = 1.048.576 – 2 = 1.048.574
Ø
Blok Subnet : 256
– 240 = 16 Ã dengan kelipatan 16
0, 16, 32, 48, 64,
80, 96, 112, 128, 144, 160, 176, 192, 208, 224, 240
Ø
IP yang Valid :
Network ID
|
10.0.0.0
|
10.16.0.0
|
10.32.0.0
|
10.48.0.0
|
Host Awal
|
10.0.0.1
|
10.16.0.1
|
10.32.0.1
|
10.48.0.1
|
Host Akhir
|
10.15.255.254
|
10.31.255.254
|
10.47.255.254
|
10.63.255.254
|
Broadcast IP
|
10.15.255.255
|
10.31.255.255
|
10.47.255.255
|
10.63.255.255
|
Network ID
|
10.64.0.0
|
10.80.0.0
|
10.96.0.0
|
10.112.0.0
|
Host Awal
|
10.64.0.1
|
10.80.0.1
|
10.96.0.1
|
10.112.0.1
|
Host Akhir
|
10.79.255.254
|
10.95.255.254
|
10.111.255.254
|
10.127.255.254
|
Broadcast IP
|
10.79.255.255
|
10.95.255.255
|
10.111.255.255
|
10.127.255.255
|
Network ID
|
10.128.0.0
|
10.144.0.0
|
10.160.0.0
|
10.176.0.0
|
Host Awal
|
10.128.0.1
|
10.144.0.1
|
10.160.0.1
|
10.176.0.1
|
Host Akhir
|
10.143.255.254
|
10.159.255.254
|
10.175.255.254
|
10.191.255.254
|
Broadcast IP
|
10.143.255.255
|
10.159.255.255
|
10.175.255.255
|
10.191.255.255
|
Network ID
|
10.192.0.0
|
10.208.0.0
|
10.224.0.0
|
10.240.0.0
|
Host Awal
|
10.192.0.1
|
10.208.0.1
|
10.224.0.1
|
10.240.0.1
|
Host Akhir
|
10.207.255.254
|
10.223.255.254
|
10.239.255.254
|
10.255.255.254
|
Broadcast IP
|
10.207.255.255
|
10.223.255.255
|
10.239.255.255
|
10.255.255.255
|