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Essentially "Double Natting" is what happens when you place your computer behind a NAT router which is itself, behind another NAT router.

Occasionally it just happens, particularly in corporate environments where you want a small network to be isolated from the corporate network it's on, which in turn is isolated from the internet that it's connected to. While it slows things down just a tad, in practice, most, though not all, things work just fine across a double NAT.

Article C2314 - March 26, 2005 « »

Leo Leo A. Notenboom has been playing with computers since he was required to take a programming class in 1976. An 18 year career as a programmer at Microsoft soon followed. After "retiring" in 2001, Leo started Ask Leo! in 2003 as a place for answers to common computer and technical questions. More about Leo.

Not what you needed?

April 3, 2005 11:09 AM

Leo. I have this problem, but i dont know how to fix it. I have a ZyXEL on the ISRA , and that one goes straight to another router. can i turn Natting off somehow? or is it really needed?

Because i have this problem, and i have about every 20 mins a disconnect when i'm in a game. it cannot Send any packets, but it can still Receive a little.

Can you tell me what to do? :( i'm out of ideas.
thanks in future


mohd altaf ali
April 6, 2005 11:30 PM

about double natting

August 17, 2005 6:01 AM

Hi !!!!

This is must due to the Double Natting.
Yes you can turn off NAT in your secondary Router and the Main Router's Router will act as DHCP server assigning static ip to the clients connected to it..

On the secondary router , you can assign static ip in the Range of the First router and then disable NAT

dharmendra Kumar
June 2, 2006 3:29 AM

Its very good site for network queries.

June 7, 2006 6:45 AM

hey leo, my belkin wireless router must have been doing that double natting thing... i turned my nat thing off my wireless router and hotmail actually works, but i can't go back to the belkin setup screeen...? where u choose settings for firewalls.. yadda yadda...

Umesh Kamath
July 25, 2006 2:22 AM

I have a fiber internet connection which terminates and connects to a netgear natting router and the router connects to the switch on which all the computers are connected. At present I have provided the ip address of the netgear router as default gateway to all the computers. Since the number of users increased it has become difficult to trace the activity as the console which I use to control the router doesnt have many features. For example if I would like to block yahoo for a particular user I cannot. My question is weather I can have double natting or not?

What I mean is that will it work if I have a computer with two lan cards and the natting routers connects to the one lan card and the other lan card connects to the switch and then install software natting like kerio winroute firewall and computers on network will use ip address of that computer as gateway which will have two lan cards so that I can manage the activity of all the users using the software firewall.

My service provider doesnt allow directly connecting the rj45 utp to the lan card on a computer.

August 20, 2006 3:56 PM

you have a fiber connection and dont know how to set up networking? boy you must have money to burn

November 24, 2006 1:37 PM

hi leo i have a problem my hotmail and msn messenger does not work other web pages though work just fine i used to use a dial up modem but i changed it to a broadband is that why and if so what can i do to fix it?

December 25, 2006 5:36 AM

Hi Leo. I would like to ask a help from you. I hope you can email me your answer. Here's my problem. I want to share my DSL connection to a friend whose basically away from my home. My DSL is 512KBPS. How can i create a connection in which it's somehow the same with ISP where he can just connect to my MODEM/ROUTER using dial up connection. What softwares should I need or procedures. Please I need your help. Please if possible can you just email me your answers( Thank you again.

June 13, 2007 11:44 PM

Tell me about natting. I know something but i wanna know how to configure it? how to use? n every aspect of it.

Derek Scott
March 3, 2009 2:50 AM

Hi, My problem is i cannot poll the second pix(Cisco 506E) or server through the first pix(Cisco 506E) using SNMP.

June 1, 2009 10:27 PM

Hi Mr. Leo,Can you please explain NATTING (Meaning and Use)in more detail.

Appreciate your help
Thank You

March 22, 2011 6:41 PM

{email removed}
you can possibly do waht you are trying to achive 2 ways. either by putting your modem in a bridge mode then by usering a - ppoe connectoidto connect ! - this way your freind would be able to open up a program configured with user name and password and could dial up the conenction .
2 2nd way to do it and this is actaully the - right way to do it is by getting your self a router and a switch cause you could only run 100 meters of cat5 then switch/ repeter then a cat5 again.
so its not really practical to do so

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