mengonfigurasi NAT

 


Berikut adalah langkah-langkah untuk mengonfigurasi NAT (Network Address Translation) pada router Cisco. Saya akan menjelaskan cara mengonfigurasi NAT Overload (PAT), yang memungkinkan beberapa alamat IP privat untuk berbagi satu alamat IP publik.

1. Masuk ke Mode Konfigurasi

Pertama, Anda perlu masuk ke mode konfigurasi pada router.

enable
configure terminal
 
2. Konfigurasi Interface
Tentukan interface yang akan digunakan untuk jaringan internal (NAT inside) dan eksternal (NAT outside).
a. Konfigurasi Interface Internal
Misalnya, untuk interface GigabitEthernet0/0:
 interface GigabitEthernet0/0
  ip address 192.168.1.1 255.255.255.0
  ip nat inside
exit
 
b. Konfigurasi Interface Eksternal
Misalnya, untuk interface GigabitEthernet0/1:
bash
 
 
interface GigabitEthernet0/1
  ip address <IP_PUBLIK> 255.255.255.0
  ip nat outside
exit
 
3. Mengonfigurasi NAT Overload
Selanjutnya, atur NAT Overload. Anda perlu membuat akses list untuk menentukan alamat IP privat yang akan diterjemahkan.
a. Buat Akses List
Misalkan Anda ingin mengizinkan seluruh subnet 192.168.1.0/24:
 access-list 1 permit 192.168.1.0 0.0.0.255
 
b. Konfigurasi NAT
Sekarang konfigurasikan NAT untuk menggunakan akses list:
 
ip nat inside source list 1 interface GigabitEthernet0/1 overload

4. Verifikasi Konfigurasi
Setelah konfigurasi, verifikasi dengan perintah berikut:
bash
show ip nat translations
show ip nat statistics

5. Uji Konektivitas
Uji konektivitas dari perangkat di jaringan internal dengan melakukan ping ke alamat IP publik. Pastikan juga perangkat di jaringan internal dapat mengakses internet.
Contoh Lengkap Konfigurasi
Berikut adalah contoh lengkap dari konfigurasi NAT Overload:
enable
configure terminal

! Konfigurasi interface internal
interface GigabitEthernet0/0
  ip address 192.168.1.1 255.255.255.0
  ip nat inside
exit

! Konfigurasi interface eksternal
interface GigabitEthernet0/1
  ip address 203.0.113.1 255.255.255.0
  ip nat outside
exit

! Membuat akses list untuk NAT
access-list 1 permit 192.168.1.0 0.0.0.255

! Mengonfigurasi NAT Overload
ip nat inside source list 1 interface GigabitEthernet0/1 overload

! Simpan konfigurasi
end
write memory

Dengan langkah-langkah ini, NAT Anda seharusnya sudah terkonfigurasi dan siap digunakan. Jika Anda memiliki pertanyaan lebih lanjut atau menemui masalah, silakan beri tahu!

 
 
 

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