Configuring NAT on WinXP

microsoft.public.windowsxp.network_web

26 Dec 2006 3:37 PM

BRS

I am a developer and don't have much knowledge on networking(All existing
configuraions are made by a person sent by my ISP). The following are my
quetions

I am using broad band connection using ADSL Router. i am facing a problem
with this. so, i want to configure the NAT service on to my PC.

1. Is it possible to move the NAT service to my PC?
2. If yes, how to do this?
3. Actually the problem is exposing a port in my PC. The external computers
are not been able to see the open port as the IP is different (i think). The
router has an option to trun off the NAT. if i turn off the NAT in my router
though the router has connected to internet, i coudnt use the inetrnet.
so, the question is. can i use the router as only a moden, and configure my
PC to directy login to the ISP. and configure my PC with the IP provided by
ISP?

Thanks

26 Dec 2006 4:45 PM

Doug Sherman [MVP]

If your device is a modem/router combo, then probably you can configure it
to act as a modem only. How you do this is product specific and you will
have to consult the manual. However, it is doubtful that XP's ICS/NAT will
have better capability than your existing router. Suggest you consult the
router's manual and/or manufacturer's tech support to determine how to map
ports with this device.

Doug Sherman
MCSE, MCSA, MCP+I, MVP

Show quoteHide quote

"BRS" <B**@discussions.microsoft.com> wrote in message
news:CF1EC04C-C798-4BD0-AD37-1784AC211BA0@microsoft.com...
> I am a developer and don't have much knowledge on networking(All existing
> configuraions are made by a person sent by my ISP). The following are my
> quetions
>
> I am using broad band connection using ADSL Router. i am facing a problem
> with this. so, i want to configure the NAT service on to my PC.
>
> 1. Is it possible to move the NAT service to my PC?
> 2. If yes, how to do this?
> 3. Actually the problem is exposing a port in my PC. The external
computers
> are not been able to see the open port as the IP is different (i think).
The
> router has an option to trun off the NAT. if i turn off the NAT in my
router
> though the router has connected to internet, i coudnt use the inetrnet.
> so, the question is. can i use the router as only a moden, and configure
my
> PC to directy login to the ISP. and configure my PC with the IP provided
by
> ISP?
>
> Thanks
>

26 Dec 2006 4:53 PM

Chuck

On Tue, 26 Dec 2006 07:37:01 -0800, BRS <B**@discussions.microsoft.com> wrote:

Show quoteHide quote

>I am a developer and don't have much knowledge on networking(All existing
>configuraions are made by a person sent by my ISP). The following are my
>quetions
>
>I am using broad band connection using ADSL Router. i am facing a problem
>with this. so, i want to configure the NAT service on to my PC.
>
>1. Is it possible to move the NAT service to my PC?
>2. If yes, how to do this?
>3. Actually the problem is exposing a port in my PC. The external computers
>are not been able to see the open port as the IP is different (i think). The
>router has an option to trun off the NAT. if i turn off the NAT in my router
>though the router has connected to internet, i coudnt use the inetrnet.
>so, the question is. can i use the router as only a moden, and configure my
>PC to directy login to the ISP. and configure my PC with the IP provided by
>ISP?
>
>Thanks

If you have a Windows XP computer that has 2 network connections, you can make a
NAT server from it. This is called Internet Connection Sharing.
<http://nitecruzr.blogspot.com/2005/05/ics-is-ok-but-you-can-do-better.html>
http://nitecruzr.blogspot.com/2005/05/ics-is-ok-but-you-can-do-better.html

But if your network configurations are being provided by the ISPs support
person, and you have no network experience, you might want to think twice about
this situation in general. Exposing a port in the computer, to the outside
world, is a security risk.

What service are you trying to provide? To the Internet as a whole, or to a
small subset?

--
Cheers,
Chuck, MS-MVP [Windows - Networking]
http://nitecruzr.blogspot.com/
Paranoia is not a problem, when it's a normal response from experience.
My email is AT DOT
actual address pchuck mvps org.

26 Dec 2006 9:08 PM

Nipi

On Dec 26, 5:37 pm, BRS <B***@discussions.microsoft.com> wrote:

> 1. Is it possible to move the NAT service to my PC?

Sometimes, not always

> 2. If yes, how to do this?

If your ISP connection cable enters the router in the uplink WAN port,
then it might be possible if you connect it instead to any LAN port on
the router, but in your case (ADSL router) i don't think it's the case

> 3. Actually the problem is exposing a port in my PC.

That's the easy part, you don't have to get rid of the whole NAT if
only one or a specific number of ports is needed, all you have to do is
tell the router to forward the incoming connections to that specific
port to your home computer. How to do it? it depends on the router, but
usualy it's an easy thing.

> The external computers are not been able to see the open port as the IP is different (i think).

The computer uses a local IP (LAN IP), which is not viewable outside ur
home network.

>The router has an option to trun off the NAT. if i turn off the NAT in my router
> though the router has connected to internet, i coudnt use the inetrnet.

You are just having one very common problem associated with NAT, but
NAT is not the problem it's the solution to the problem of sharing a
connection, so disabling the NAT completely only causes more pain.

Show quoteHide quote

> so, the question is. can i use the router as only a moden, and configure my
> PC to directy login to the ISP. and configure my PC with the IP provided by
> ISP?
>
> Thanks

10 Jan 2007 8:57 AM

BRS

Thanks Nipi,

With the limited knowledge i have, NAT is for sharing the same internet
connection across different PCs.
in my case its only one PC that is using the Internet. so i can dissable
NAT. And directly connect to internet. i want to know how to do this.

Thanks for the rsponce

Ravi

Show quoteHide quote

"Nipi" wrote:

>
>
> On Dec 26, 5:37 pm, BRS <B***@discussions.microsoft.com> wrote:
>
> > 1. Is it possible to move the NAT service to my PC?
>
> Sometimes, not always
>
>
> > 2. If yes, how to do this?
>
> If your ISP connection cable enters the router in the uplink WAN port,
> then it might be possible if you connect it instead to any LAN port on
> the router, but in your case (ADSL router) i don't think it's the case
>
>
> > 3. Actually the problem is exposing a port in my PC.
>
> That's the easy part, you don't have to get rid of the whole NAT if
> only one or a specific number of ports is needed, all you have to do is
> tell the router to forward the incoming connections to that specific
> port to your home computer. How to do it? it depends on the router, but
> usualy it's an easy thing.
>
>
> > The external computers are not been able to see the open port as the IP is different (i think).
>
> The computer uses a local IP (LAN IP), which is not viewable outside ur
> home network.
>
>
>
> >The router has an option to trun off the NAT. if i turn off the NAT in my router
> > though the router has connected to internet, i coudnt use the inetrnet.
>
> You are just having one very common problem associated with NAT, but
> NAT is not the problem it's the solution to the problem of sharing a
> connection, so disabling the NAT completely only causes more pain.
>
>
>
> > so, the question is. can i use the router as only a moden, and configure my
> > PC to directy login to the ISP. and configure my PC with the IP provided by
> > ISP?
> >
> > Thanks
>
>

12 Jan 2007 9:11 AM

Nipi

If you want to disable the NAT, but you keep the router connected, then
you must use it as a HUB only (or so simply buy a HUB instead)
If you don't want to plug the ISP company's cable directly to your
computer, and you want to keep it through the router, then you must
make your computer and the ISP network ON THE SAME NETWORK.
The only way to do that, is to disable the router's local network
functionality, by disabling the DHCP service inside it, because you
won't be using an internal network, but only the ISP direct connection.
The the most important thing, which is why i said sometimes it works,
not always, this is the step when you have to stop using the router's
WAN port (the uplink port to the ISP), but instead, to connect your ISP
cable to a LAN port in the router instead (which turns the router into
a HUB). As you can imagine, this doesn't work except if your internet
cable is an ethernet cable, like the one which comes from a cable
modem, but if your were using a type of internet connection of which
the ISP cable cannot be connected to a HUB (which is most likely your
case, ADSL router), then you need to use a device other than a router,
which can connect you to the ISP directly, like ADSL modem, which i
suppose you don't have it otherwise you would have connected it to the
computer and threw the router away.
The difference between router and modem is that the modem doesn't use
NAT, because it can't share a connection, it only gives one computer.

BRS wrote:
Show quoteHide quote

> Thanks Nipi,
>
> With the limited knowledge i have, NAT is for sharing the same internet
> connection across different PCs.
> in my case its only one PC that is using the Internet. so i can dissable
> NAT. And directly connect to internet. i want to know how to do this.
>
> Thanks for the rsponce
>
> Ravi
>
> "Nipi" wrote:
>
> >
> >
> > On Dec 26, 5:37 pm, BRS <B***@discussions.microsoft.com> wrote:
> >
> > > 1. Is it possible to move the NAT service to my PC?
> >
> > Sometimes, not always
> >
> >
> > > 2. If yes, how to do this?
> >
> > If your ISP connection cable enters the router in the uplink WAN port,
> > then it might be possible if you connect it instead to any LAN port on
> > the router, but in your case (ADSL router) i don't think it's the case
> >
> >
> > > 3. Actually the problem is exposing a port in my PC.
> >
> > That's the easy part, you don't have to get rid of the whole NAT if
> > only one or a specific number of ports is needed, all you have to do is
> > tell the router to forward the incoming connections to that specific
> > port to your home computer. How to do it? it depends on the router, but
> > usualy it's an easy thing.
> >
> >
> > > The external computers are not been able to see the open port as the IP is different (i think).
> >
> > The computer uses a local IP (LAN IP), which is not viewable outside ur
> > home network.
> >
> >
> >
> > >The router has an option to trun off the NAT. if i turn off the NAT in my router
> > > though the router has connected to internet, i coudnt use the inetrnet.
> >
> > You are just having one very common problem associated with NAT, but
> > NAT is not the problem it's the solution to the problem of sharing a
> > connection, so disabling the NAT completely only causes more pain.
> >
> >
> >
> > > so, the question is. can i use the router as only a moden, and configure my
> > > PC to directy login to the ISP. and configure my PC with the IP provided by
> > > ISP?
> > >
> > > Thanks
> >
> >