STUDI KASUS ROUTING STATIC + SUBNETTING VLSM

Sebuah perusahaan terdiri dari 3 lantai dan ingin membangun sebuah jariungan perlantainya dengan ketentuan:
a. Lantai 1 = 10 host
b. Lantai 2 = 20 host
c. Lantai 3 = 10 host
Dengan topologi dibawah ini, buatlah suatu jaringan perusahaan tersebut dengan menggunakan routing static dengan IP localnya 192.168.2.0/27.

1. Subnetting VLSM

192.168.2.0/27

 Range Host

Lanti 2 = 20 Host ; 2⁵  – 2 = 32 – 2 = 30 Host

Lanti 1 = 10 Host ; 2⁴  – 2 = 16 – 2 = 14 Host

Lanti 3 = 10 Host ; 2⁴  – 2 = 16 – 2 = 14 Host

Bit Network

Lantai 2 = 20 Host ; 32 – 5 = /27

Lantai 1 = 10 Host ; 32 – 4 = /28

Lantai 3 = 10 Host ; 32 – 4 = /28

Blok Subnet

Lantai 2 = 20 Host ; 256 – (/27) ; 256 – 224 = 32

Lantai 1 = 10 Host ; 256 – (/28) ; 256 – 240 = 16

Lantai 3 = 10 Host ; 256 – (/28) ; 256 – 240 = 16

Nama Network	Subnet	Range Host	Broadcast
Lantai 2	192.168.2.0/27	192.168.2.1 – 192.168.2.30	192.168.2.31
Lantai 1	192.168.2.32/28	192.168.2.33 – 192.168.2.46	192.168.2.47
Lantai 3	192.168.2.48/28	192.168.2.49 – 192.168.2.62	192.168.2.63

Di dapat IP masing – masing untuk PC dan Router.

Device	Interface	IP Address	Subnet Mask	Default Gateway
Router Lt.1	Fa0/0	192.168.2.33	255.255.255.240	N/A
	Se0/0/0	192.168.4.1	255.255.255.0	N/A
Router Lt.2	Fa0/0	192.168.2.1	255.255.255.224	N/A
	Se0/0/0	192.168.3.2	255.255.255.0	N/A
	Se0/0/1	192.168.4.2	255.255.255.0	N/A
Router Lt.3	Fa0/0	192.168.2.49	255.255.255.240	N/A
	Se0/0/0	192.168.3.1	255.255.255.0	N/A
PC0-PC4	NIC	192.168.2.34 – 192.168.2.39	255.255.255.240	192.168.2.33
PC5-PC9	NIC	192.168.2.2 – 192.168.2.6	255.255.255. 224	192.168.2.1
PC10-PC14	NIC	192.168.2.50 – 192.168.2.54	255.255.255.240	192.168.2.49

Setelah semua mendapat IP, maka kita lanjuk ke konfigurasi Router Static, disini saya menggunakan Aplikasi Packet Tracer dalam konfigurasinya.

2. Konfigurasi:

Router Lt.1

RouterLt1(config)# ip route 192.168.2.0 255.255.255.224 192.168.4.2

RouterLt1(config)# ip route 192.168.3.0 255.255.255.0 Serial0/0/1

RouterLt1(config)# ip route 192.168.2.48 255.255.255.240 Serial0/0/0

Router Lt.2

RouterLt2(config)# ip route 192.168.2.32 255.255.255.240 192.168.4.1

RouterLt2(config)# ip route 192.168.2.48 255.255.255.240 Serial0/0/0

Router Lt.3

RouterLt1(config)# ip route 192.168.2.32 255.255.255.240 192.168.4.1

RouterLt1(config)# ip route 192.168.2.0 255.255.255.224 Serial0/0/0

RouterLt1(config)# ip route 192.168.4.0 255.255.255.0 Serial0/0/0

Setelah selesai konfigurasi, maka kita tes hasilnya.

Hasil ping dari PC0 Router Lt.1 ke PC5 Router Lt.2

Hasil ping dari PC6 Router Lt.2 ke PC10 Router Lt.3

Hasil ping dari PC12 Router Lt.3 ke PC1 Router Lt.1