Network Address Translator menggunakan Cisco Router

07 Jun

Jika kita ingin terhubung dengan internet dari Local Area Network maka diperlukan gateway sebagai pintu gerbang mengakses internet.

Dlm konfigurasi ini, gateway berbentuk sebuah router Cisco yang mengimplementasikan teknologi NAT (Network Address Translation). NAT digunakan untuk menyediakan koneksi internet kepada seluruh anggota jaringan internal (LAN) menggunakan satu alamat IP Public.

Jaringan di luar LAN akan mengenal satu IP address untuk menghubungi setiap perangkat di jaringan internal, sehingga identitas dari perangkat internal dapat disembunyikan demi alasan keamanan dan penghematan IP address.

Berikut akan dijelaskan bagaimana mengkonfigurasi jaringan internal ini sehingga terhubung ke internet menggunakan Cisco router.

Tahap 1.
Mengkonfigurasi IP Address Local Router

LocRouter#configure terminal
LocRouter(config)#interface Gi0/0
LocRouter(config-if)#ip address
LocRouter(config-if)#no shutdown

LocRouter#configure terminal
LocRouter(config)#interface Gi0/1
LocRouter(config-if)#ip address
LocRouter(config-if)#no shutdown

Tahap 2.
Menkonfigurasi Default Gateway

LocRouter#configure terminal
LocRouter(config)#ip route

Tahap 3.
Menkonfigurasi DNS Server

LocRouter#configure terminal
LocRouter(config)#ip name-server

Tahap 4.
Mengkonfigurasi Network Address Translation

Untuk membuat komputer LAN mendapatkan layanan Internet, maka Router Cisco harus menjalankan NAT (masquerade) untuk network

LocRouter#configure terminal
LocRouter(config)#access-list 1 permit
LocRouter(config)#ip nat inside source list 1 interface Gi0/0 overload
LocRouter(config)#interface Gi0/0
LocRouter(config-if)#ip nat outside
LocRouter(config-if)#interface Gi0/1
LocRouter(config-if)#ip nat inside

Tahap 5.
Mengkonfigurasi DHCP

Pada tahap ini digunakan untuk membuat komputer LAN bisa mendapatkan IP Address secara otomatis dari Router Cisco (DHCP Server).

LocRouter(config)#ip dhcp excluded-address
GATEWAY(config)#ip dhcp pool LAN-POOL

IP Address sampai dengan adalah IP Address yang tidak akan diberikan kepada komputer pada LAN.

Sampai pada tahapan ini, seharusnya komputer pada LAN sudah dapat mengakses layanan Internet.


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