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Novice
Posts: 0
Registered: ‎2007-10-27

NAT Filtering: Secured vs. Open

WPN824v1, Firmware rev. V2.0.120_1.0.15

Either this or the last firmware update have dropped in a new configuration option.

Within my Advanced->WAN setup, it offers new radio buttons:

NAT Filtering: o Secured o Open

I understand most of NAT, but what could this be doing? Is it enforcing that data can only be backchanneled to a system who originated the data first? There is no explanation for it in the WPN824 manual (which doesn't list this option at all), and the on-screen description for it is vague.
Luminary
Posts: 89,285
Registered: ‎2009-01-27

Re: NAT Filtering: Secured vs. Open

http://en.wikipedia.org/wiki/Network_address_translation
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June Mizoguchi-
Novice
Posts: 0
Registered: ‎2007-10-27

Re: NAT Filtering: Secured vs. Open

jmizoguchi wrote:
http://en.wikipedia.org/wiki/Network_address_translation


I understood most of that already. The question is what is meant by "secured" and "open".

I'm assuming that "open" doesn't mean the wikipedia "basic nat" where an external IP is required for each LAN side system. I was assuming that port translation would occur either way, no?

The reason I'm questioning this new "feature" of the router is that for some reason, and I believe it to be since this was added, others cannot get to my system when I run it as a unreal tournament game server. This used to work fine with port forwarding directly to my static ip. It stopped working, but there seems to be several things going wrong at once that day, requiring me to get a new modem.

So what does secured mean? Port translation? What does open mean? No port translation? Confused.
Initiate
Posts: 2
Registered: ‎2007-12-03

Re: NAT Filtering: Secured vs. Open

tgm1024 wrote:
I understood most of that already. The question is what is meant by "secured" and "open"...


The MOD either doesn't know the product to know it's a new feature or didn't read your full post because that was a less than adequate response.

My WGR814 v6 has been hosed with port forwarding to a static IP since the latest firmware I've updated to (v2.0.19_1.0.19NA) and its predecessor.

I also cannot connect to Vista computers via Remote Assistance anymore now. Same story with firmware.

I will change to Open mode (whatever that is:rolleyesSmiley Happy and see if that fixes my RDP port forward. Won't be able to test the Vista situation soon but I wanted you to know you're not alone in this.
Highlighted
Initiate
Posts: 2
Registered: ‎2007-12-03

Re: NAT Filtering: Secured vs. Open

Changing from Secured to Open opened my static port forward.
Changed it back to Secured and still using my static port forward.

I suppose you have already-tried changing its setting just to 'register' the new firmware's feature, in case the flash didn't do so?
Tutor
Posts: 110
Registered: ‎2012-10-31

Re: NAT Filtering: Secured vs. Open

NAT Filtering

This option determines how the router deals with inbound traffic. The Secured option provides a secured firewall to protect the PCs on LAN from attacks from the Internet, but it may cause some Internet games, point-to-point applications, or multimedia applications not to work. The Open option, on the other hand, provides a much less secured firewall, while it allows almost all Internet applications to work.
- readynas & readydata fixer
Initiate
Posts: 2
Registered: ‎2012-10-12

Re: NAT Filtering: Secured vs. Open

kossboss wrote:
NAT Filtering

This option determines how the router deals with inbound traffic. The Secured option provides a secured firewall to protect the PCs on LAN from attacks from the Internet, but it may cause some Internet games, point-to-point applications, or multimedia applications not to work. The Open option, on the other hand, provides a much less secured firewall, while it allows almost all Internet applications to work.


The above is quoted straight from the User Manual.

I'd also like to know what the difference is between Secured and Open NAT Filtering, and what is a "much less secured firewall" as referred to above? Some specifics would be nice.
Apprentice
Posts: 2,024
Registered: ‎2011-05-23

Re: NAT Filtering: Secured vs. Open

This thread was 5 years old. The OP and others involved have most likely moved on. Isn't it better to start your own thread?
Initiate
Posts: 2
Registered: ‎2012-10-12

Re: NAT Filtering: Secured vs. Open

Yes, only realised that just after I posted. My question is still valid though.

I did manage to find a bit of info by 'Googling' the question, but a reply from someone from Netgear would be great. The User Manual glosses over quite a few topics I'd like further information on.

Cheers.
Apprentice
Posts: 2,024
Registered: ‎2011-05-23

Re: NAT Filtering: Secured vs. Open

judanini wrote:
...a reply from someone from Netgear would be great...

This is a user-to-user forum only, where people try to share their experiences and help each other. This is not Customer Support and we don't work for Netgear.

You are obviously looking for an official answer from Netgear. You will not find that here. For that you will have to open a case with Netgear.

Please also read the "Sticky Thread" on Thread Hijacking.
Aspirant
Posts: 2
Registered: ‎2016-05-08

Re: NAT Filtering: Secured vs. Open

Farrrk, this NetGear forum is the worst I've come across with getting help from members! You sound like a trumped up bunch of prepubescent acne riddled little twerps. "This is a user to user forum" "read thread hijacking" "I'm just going to post a link that is only remotely related to what you're asking". Who gives a damn if the thread is 20 years old, we've obviously landed here looking for a solution to exactly the same problem that the original poster had. It doesn't matter how long a time frame it's been. And besides, wouldn't it be easier for all future people looking for answers to just come to the one thread? Rather than starting multiple of their own, when in those cases all you little twerps do is post a link back to the years old thread anyway. What a disgusting bunch of forum users you all are. I'm still interested in learning more about NAT, maybe the answer on Google or Wikipedia doesn't explain it in terms I understand. Or maybe you'd think you'd get a more tailored answer from the very forum of the company that manufactures the router. So if some kind and patient user has the time to explain it in a little more depth, I'd love to hear from you. All you unhelpful, snotty nosed twits who just want to jump down someone else's throats, go drown in your diet Pepsi and choke on your Twinkies.
NETGEAR Moderator
Posts: 5,283
Registered: ‎2015-07-08

Re: NAT Filtering: Secured vs. Open

@NeilSmithe Calm down.

 

This option determines how the router deals with inbound traffic. The Secured option provides a secured firewall to protect the PCs on LAN from attacks from the Internet, but it may cause some Internet games, point-to-point applications, or multimedia applications not to work. The Open option, on the other hand, provides a much less secured firewall, while it allows almost all Internet applications to work.

ElaineM
Community Team
Sensei
Posts: 4,567
Registered: ‎2015-02-17

Re: NAT Filtering: Secured vs. Open

FWIW, I think this article explains the different forms of NAT in the simplest terms possible (link).  The explanation also match the Wikipedia article on NAT (link), although I find the Wikipedia article a little less clear.

 

Relating this to Netgear's NAT setting, I believe Open NAT is equivalent to Full Cone NAT, and Secured NAT is either Restricted Cone or Port Restricted Cone NAT.

Aspirant
Posts: 1
Registered: ‎2009-09-20

Re: NAT Filtering: Secured vs. Open

 

Thanks for taking the time to offer a theory.   

I appreciate that some earlier poster pointed out that threads live on long after the OP has received or not received an answer.

Obviously I came looking for an answer the the same question.

My model is a bit different NETGEAR router that has the same NAT SECURED OR OPEN possible settings.

Maybe that radio button was designed to alternate between the 2 cone models offered as a potential resolution and it just does not work as it is supposed to on my Netgear.

 

It would be great if anyone comes along with a definitive answer so that all can understand. 

Is it a different definition or is the function defective on my router?

 

I set my router to secured and I rebooted the connected computer and the router.

 

I attempted to access the computer via a forwarded port from a different public IPAddress and it was successful.

 

Maybe I do not properly understand but to my eye it looks to me as:

 

 If the offered description was accurate for my NETGEAR router I would have been denied forwarding until the LAN ATTACHED computer initiated a contact to the foreign address I was able to successfully remote in from.

 

 

 

Sensei
Posts: 4,567
Registered: ‎2015-02-17

Re: NAT Filtering: Secured vs. Open

[ Edited ]

Ahh, you are getting the NAT setting and port forwarding confused. The NAT setting governs incoming traffic that is associated with traffic initiated from a LAN attached computer.  Port forwarding is designed to allow a computer on the Internet to initiate contact to a LAN attached computer. Port forwarding is how you make a home server reachable from the Internet. The NAT setting doesn't come into play when port forwarding is involved.

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