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I'm trying to force a strict NAT on a Linksys E2500, but I'm unsure how to do that. Normally with my old Linksys router, I would have to do some port forwarding to get an open NAT, however I didn't have to do that with this new one. It still has the option to port forward, DMZ, and all of that. I need to brush up a bit on my routers/networking stuff, so I'm not quite sure what's going on, or what extra thing this new one has that makes it so I don't need to port forward.

EDIT: I am terribly sorry... It seems I was able to figure it out shortly after I posted this. I knew of the term "UPnP", but I'm still unclear of exactly what it is. My only guess would be that it's a list of rules. Well, I found the option to disable it, in the unlikely place under the administration tab. (rather than under security)This has successfully limited my NAT to moderate, which is good enough for what I'm trying to do.

I would be grateful yet, if someone could help me get it to fully strict.

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closed as off-topic by Falcon Momot, Ward, Bryan, Scott Pack, Dennis Kaarsemaker Jul 6 '13 at 18:19

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UPnP is a protocol used whereby a client can negotiate with the edge NAT router/firewall to automatically setup dynamic port forwarding as needed, but after idle time the port forward expires. Have you read the documentation? –  SpacemanSpiff Dec 19 '11 at 10:03
    
the only documentation that came with the router was instructions for how to set it up, but it didn't cover the advance things. by advance, I mean anything that requires working through the access point in the browser. there is some documentation on the site itself, but they're only brief explanations of what everything is. –  Shea Dec 19 '11 at 10:39
    
I'm normally just a coder, not even a programmer... I've got a fairly good idea of how all of this works, but I need to brush up on my networking, which I only know the very basics of. thank you for your explanations of what UPnP does/is. this is been very insightful information. –  Shea Dec 19 '11 at 10:41
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1 Answer

Take a look at this link here:

http://homedownloads.cisco.com/downloads/userguide/1224666742770/Routers_Combined_UG-IPv6_rev-Final-Web.pdf

The relevant sections for advanced port forwarding are pretty straightforward and easy to understand. If you are going to setup static destination NATs you would do well to disable UPnP to avoid collisions. You cannot forward the same external port to multiple hosts, so be prepared to change those things up.

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