Log for 電訊台

#### Setting up external interface ####
interface g0/0
ip address dhcp
ip nat outside

#### Setting up internal interface ####
interface g0/1
ip address 192.168.1.1 255.255.255.0


#### Setting up PAT ####
access-list 1 permit 192.168.1.0 0.0.0.255
ip nat pool NAPT IP_GW IP_GW netmask 255.255.255.255
ip nat inside source list 1 pool NAPT overload

#### Setting ip DHCP Server ####
ip dhcp pool lan
network 192.168.1.0 255.255.255.0
default-router 192.168.1.1
dns-server 8.8.8.8 8.8.4.4 4.4.4.4

####  ####

You have to configure ip nat inside on inside (LAN) interface and ip nat outside on WAN interface.

Then you canconfigure portforward:

ip nat insdie source static tcp 10.0.0.10 1122 150.0.0.1 2233

tcp - protocol, which you want to forward TCP/UDP

10.0.0.10 - IP address of your private device

1122 - port on your private device which you want access

150.0.0.1 - public IP which will represent your private device in internet

2233 - public port which will be forwarded to defined port on private device

Gateway(config)# ip nat inside source list 1 interface serial 0/0/1 overload