Filter Internet NAT Redirection

What Is Internet NAT Redirection?



An Internet Protocol address is assigned to all computers and devices connected to the Internet. This IP address is used to identify each connection and direct traffic to the appropriate destination. However, when a user connects numerous Internet devices to the same Internet service, a conflict in IP addresses prevents correct signal routing. Routers employ Network Address Translation to solve this problem and ensure that data is sent and received correctly.

IP Addresses in Your Area

When computers connect through a router, the router allocates a local IP address to each of them. These local addresses, unlike global IP addresses, are unique to the Local Area Network. They allow local computers to communicate with one another, and the router utilises them to identify each one separately. Meanwhile, the router connects to the Internet using an IP address that allows it to browse the Web and communicate with other computers on the network.

Routing of packets

When a computer on a local network seeks information from the Internet, it first goes through the router. The router determines which local computer requested the data and then sends the request over the Internet to that machine. Because the distant server transmitting the data only knows the router’s IP address, the requested data packets are returned to the router. When the router gets them, it applies NAT to match the data to the outgoing request and converts the destination address from its own IP to the proper computer’s local IP.

Effect of a Firewall

A hardware firewall filters out hacking attempts by intercepting all incoming data from the Internet. While a router does not have this level of filtering, NAT allows it to function as a rudimentary firewall. When a signal reaches the router, it must determine to which local computer it should be forwarded. It ignores a signal if it does not recognize it as having been requested by a local computer. This protects against the majority of common threats, but it is insufficient for corporate servers that store important data.

Forwarding of Ships

Some genuine packets are also discarded as a result of the firewall effect during NAT. Many games and peer-to-peer sharing systems, for example, rely on remote data provided without a direct request. Normally, routers disregard this information since they don’t know where to send it. Users can circumvent this by configuring port forwarding in their routers. Port forwarding instructs the router to transfer all data received across specified Internet ports to specific computers, even if the data was not requested locally.

FAQ – Filter Internet NAT Redirection

Filter Internet DNS Redirection

My Cisco router offers the option to:

Filter Internet NAT Redirection

The router is only able to say:



“This feature uses Port Forwarding in order to block access to local servers

From your local networked computer.”

Please let me know if this should be turned on all the time.

It is disabled by default.

This option is designed to prevent me from connecting to my own network?

Computers – or is this an option to prevent outsiders

Connecting to my computers (perhaps through a compromised system). What?

Filter Internet DNS

The Filter Internet NAT option of my WRT54G is confusing me. It is useful or will it block LAN side machines accessing facilities?

Filter Internet DNS Redirection

What is this feature on a Linksys Router and how do I enable it? Do I need to enable it or disable?

For the simplest security, The default setting is to disable.

Internet Redirection – What’s it?

Just upgraded my Linksys BEFW11S4 to 1.50.10 firmware.



The new firmware now has the option to enable/disable ‘Filter InternetNAT Redirection’.

What is it and why should I have it enabled or disabled in my home network? What is it?

Jennifer Thomas
Jennifer Thomas is the Co-founder and Chief Business Development Officer at Cybers Guards. Prior to that, She was responsible for leading its Cyber Security Practice and Cyber Security Operations Center, which provided managed security services.