CONFIGURING CISCO ROUTER AS INTERNET GATEWAY

Perhatikan gambar berikut :

Langkah-langkah konfigurasi

1.      Beri alamat interface dan aktifkan port router

Router (config) # int gi0/0

Router (config-if ) # ip add 192.168.125.254 255.255.255.0

Router (config-if ) # no shutdown

Router (config-if ) # int gi0/1

Router (config-if ) # ip add 192.168.206.254 255.255.255.0

Router (config-if ) # no shut

2.      Konfig NAT Dyamic Overload with Exit Interface

Router (config) # int gi0/0

Router (config-if ) # ip nat outside

Router (config-if ) # int gi0/1

Router (config-if ) # ip nat inside

Router (config-if ) # exit

Router (config ) # access-list 1 permit  192.168.206.0   0.0.0.255

Router (config ) # ip nat inside source list 1 interface gi0/0 overload

3.      Konfig default route

Router (config) # ip route 0.0.0.0   0.0.0.0   192.168.125.1

4.   Beri alamat DNS server
      Router (config) # ip name-server 8.8.8.8
    
5.   Konfig banner, remote access telnet dan ssh

Router (config) #  hostname Gateway

Gateway (config) # banner motd c YANG TIDAK BERHAK DILARANG MENGAKSES c

Gateway (config) # enable secret bismillah

Gateway (config) # username mrwawanux secret bismillah

Gateway (config) # ip domain-name mrwawanux.local

Gateway (config) # crypte key generate rsa

Gateway (config) # line vty 0 4

Gateway (config-line) # login local

Gateway (config-line) # transport input all

6.      Konfig DHCP server

Gateway (config) # ip dhcp pool CLIENT

Gateway (dhcp-config) # network 192.168.206.0 255.255.255.0

Gateway (dhcp-config) # default-router 192.168.206.254

Gateway (dhcp-config) # dns-server 8.8.8.8

7.   Simpan konfigurasi 
      Gateway (config) # write memory      

 8.  Lakukan pengujian hasil konfigurasi

Client seharusnya bisa akses internet