Re: Getting past the NAT

["Jeremy M. Harmer" <jeremy@xxxxxxx>]

Hi,

As there is only one external IP, and as these are separate machines on the
inside, you need to choose a different port for each internal machine and
set up the NAT tables for that. That way, e.g. 212.25.25.25:80 will be your
web server, mapped to 192.168.1.42:80, 212.25.25.25:81 could be your cam,
mapped to 192.168.1.3:80, etc.

(the :80 is not needed of course from a web browser as it is default, but
Internet accesses to http://212.25.25.25:81 will get into your
cam, etc.)

Jeremy.

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----- Original Message -----
From: "Derek Erb" <dce42@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Friday, October 03, 2003 12:27 PM
Subject: [ukha_d] Getting past the NAT


> I'm hoping this isn't considered OT...
>
> I have worked with quite a few routers and firewalls.  I'm therefore
> reasonably accustomed to NAT addressing.
>
> Normally the only time I need to access a computer from the Internet
> is for a bit of pcAnyWhere.  I therefore use the IP address of the
> router as it is seen from the Internet and reconfigure the firewall
> quickly to assign the internal IP address of the computer I want to
> connect to (192.168.1.x) to the PCAW port and then I can connect
> through to that computer.
>
> In my new home I'm going to have several computers and applieances I
> am going to want to connect to from the outside on the Internet
> (network cameras (Axis), security alarm system, computers with web
> cams, ...).
>
> I am hoping to have a fixed IP address for my Internet connections
> (ADSL & Cable).  But does anyone know how I can get past the net
to
> the specific machine I want?
>
> To give a specific example:
> Let's say my external IP address for my router is 212.25.25.25.
> Behind the router I've got a network camera with 192.168.1.3, a web
> server with 192.168.1.42 and a security alarm system with
> 192.168.1.69.
>
> >From the Internet I can only see 212.25.25.25.  Can anyone tell me
> some way that I can access the 3 machines which are behind the
> router from the Internet?
>
> Thank you in advance for any ideas or suggestions you may have.
>
>
>
>
> UKHA 2004: 15th and 16th May 2004
>
> http://www.automatedhome.co.uk
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