Filter Internet NAT Redirection – Here we can see, “Filter Internet NAT Redirection”

What is Internet NAT Redirection?

An online Protocol address is a unique number that is assigned to all computers and devices connected via the internet. This address is used to identify each connection and direct traffic to the correct destination. A conflict between IP addresses could cause signal direction problems if multiple users connect to the same Internet service. Routers can use Network Address Translation (NAT) to send and receive data correctly.

Local IP addresses

The router assigns an area IP address to all computers that connect to it. These local addresses are not available globally, but only within the Local Area Network. These local addresses allow computers to contact each other through them and the router can use them to identify them individually. Meanwhile, the router connects to the web with an Internet-wide IP address, allowing it to browse online and get in touch with other computers on the web.

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Packet Routing

The router receives data requests from computers in an area network. The router determines the local computer that requests the information and sends the request to it over the internet. The router’s IP address is not known by the remote server that sends the information. It then returns the requested data packets to the router. The router receives the packets and uses NAT to match them to the outgoing request. It then translates the destination address from the router’s IP to the correct computer’s local IP.

Firewall Effect

Hardware firewalls intercept all data coming from the internet and filter out hackers. Although a router does not have the same level of filtering, it can be used as a simple firewall thanks to NAT. The router will decide to which computer it should pass a signal that reaches it. It rejects any signal it does not recognize as being requested by any local computer. It blocks most threats but is not sufficient for sensitive corporate servers.

Port Forwarding

Some legitimate packets are also rejected by NAT due to the firewall effect. Some Internet applications, such as many games or peer-to-peer share services, may believe that remote data has been sent without a request. This data is usually ignored by routers, as they don’t know where to send it. Users can fix this issue by setting port forwarding in router settings. Port forwarding directs the router to send all data coming over specified Internet ports to particular computers, albeit that data wasn’t locally requested.

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Questions for the User:

  1. 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 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 (possibly via compromised systems)? What?


  1. 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?

  1. 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 it?

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

  1. 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?

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