To configure NAT

This page allows you to configure the NAT settings for your Firewall interfaces. By default, NAT has been enabled.

1    At the Security Configuration Interface page, Security Interfaces section, click Advanced NAT Configuration... .

2    To create a pool of global address, click Add Global Address Pool... .  To create reserved mapping, click Add Reserved Mapping... . By default, no global address pools and reserved mappings are defined.

3    To delete an existing Global Address Pool or Reserved Mapping, click the Delete button corresponding to the Global Address Pool or Reserved Mapping that you want to remove. The addresses will be removed immediately. 

Global Address Pools Allows you to create a pool of outside network addresses. A network address pool is a range of IP addresses that is visible outside your network. NAT translates packets between the outside addresses and the inside interfaces that each address is mapped to. 
Reserved Mapping 

Allows you to map IP addresses to individual hosts on an inside interface type. Also known as NAT Inbound or Port Forwarding.

4    To save the changes permanently, click Save Config (Configuration option). Changes that are not saved will be lost the next time you power off or restart your Router.

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To Add Global Address Pool

1    Enter the required information.

Interface Type internal: interface that connects to the internal network.
dmz:
interface that connects to the de-militarized zone (DMZ).
Use Subnet Configuration Use Subnet Mask: Select this option if you are specifying a specific IP address. 
Use IP Address Range:
Select this option if you are specifying a range of IP address. 
IP Address The IP address that is visible outside the network.
Subnet Mask / IP Address 2 Subnet Mask: The subnet mask of the network IP address.
IP Address 2: The last IP address in the range of addresses that make up the global address pool.

2    Click Add Global Address Pool.

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To Add Reserved Mappings

1    Enter the required information.

Global IP Address The IP address of an outside interface set using the Global Address Pools. Leave the value as 0.0.0.0 if you are not sure which Global IP Address you should fill in.
Internal IP Address The IP address of an individual host inside the network (internal or DMZ interface type). For this case, Internal IP Address 192.168.1.2 is the computer's IP Address that you need to host your FTP Server.
Transport Type Select Transport Type as TCP.

Below are the different Transport Type explanation: -

icmp: Internet Control Message Protocol (ICMP) is set as the transport type. ICMP messages are used for out-of-band messages related to network operation or mis-operation.
igmp: transport type. Allows Internet hosts to participate in multicasting.
ip: Internetwork Protocol (IP). Provides all of the Internet's data transport services.
egp: Exterior Gateway Protocol (EGP). Protocol for exchanging routing information between autonomous systems.
rsvp: Resource Reservation Protocol (RSVP) is set as the transport type. Supports the reservation of resources across an IP network.
ospf: Open Shortest Path First (OSPF) is set as the transport type. A link-state routing protocol.
ipip: IP-within-IP Encapsulation Protocol. Encapsulates an IP datagram within a datagram.
all: All traffic is translated between the global IP address and the specified inside address that it is mapped to.
Port Number The network protocol port numbers (e.g. 21 is for FTP Server, and 80 is for HTTP Server). For this case, the Port Number is 21.

2    Click Add Reserved Mapping.

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