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Nat or Non NAT


« PlusNet | e7even »

 
 
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  #1  
Old May 13th 04, 06:52 PM posted to uk.telecom.broadband
Mike Saunders
external usenet poster
 
Posts: 9
Default Nat or Non NAT

I am educating myself about routers, security etc and would like to know
what are the main reasons why you would not choose a NAT'd router setup

Many thanks

Mike Saunders


  #2  
Old May 13th 04, 07:44 PM posted to uk.telecom.broadband
Tiscali Tim
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Posts: 755
Default Nat or Non NAT

In an earlier contribution to this discussion,
Mike Saunders wrote:

I am educating myself about routers, security etc and would like to
know what are the main reasons why you would not choose a NAT'd
router setup

Many thanks

Mike Saunders


Not an expert, but this is my understanding. With NAT, the individual IP
addresses of the PCs on your network are not visible to the outside world -
which is fine for most domestic purposes. However, if you are hosting
services on individal PCs which need to be accessed from outside, the
individual IP addresses need to be visible, so you can't hide them behind
NAT.
--
Cheers,
Tim
______
Please reply to newsgroup. Reply address is Black Hole!


  #3  
Old May 13th 04, 07:48 PM posted to uk.telecom.broadband
PlusNet Support
external usenet poster
 
Posts: 109
Default Nat or Non NAT

On Thu, 13 May 2004 17:52:41 +0100, "Mike Saunders"
wrote:

I am educating myself about routers, security etc and would like to know
what are the main reasons why you would not choose a NAT'd router setup

Many thanks

Mike Saunders


No-NAT is generally used when a server or machine needs to have a
public IP. Things like FTP & Web servers and firewalls are the most
common requests we get here for no-NAT accounts.

regards

Luke
| Luke Horwath Broadband Solutions
| Comms team for Home & Business
| PlusNet Technologies Ltd. @ http://www.plus.net
+ ----- My Referrals - It pays to recommend PlusNet -----+
  #4  
Old May 13th 04, 11:05 PM posted to uk.telecom.broadband
shope
external usenet poster
 
Posts: 15
Default Nat or Non NAT


"Mike Saunders" wrote in message
...
I am educating myself about routers, security etc and would like to know
what are the main reasons why you would not choose a NAT'd router setup


a router not using NAT is a "real" router - what a network is usually built
out of where you want any to any connectivity. A NAT home router is really
the specialised device.

For example, all those big boxes in the backbone of your ISP cant use NAT,
as they need to allow lots of TCP in any direction

NAT serves 2 main purposes - to limit the number of visible IP addresses on
1 side (the untrusted or WAN port), and to restrict connection attempts from
1 side, since the translation table is built on the fly.

These characteristics make it useful for a small SOHO network connecting to
a simple Internet connection such as DSL or cable.

NAT has some restrictions - slow compared to IP routing (which only matters
with backbone IP routers), and some protocols do not work properly through
NAT.

Many thanks

Mike Saunders

--
Regards

Stephen Hope - return address needs fewer xxs


  #5  
Old May 13th 04, 11:51 PM posted to uk.telecom.broadband
external usenet poster
 
Posts: n/a
Default Nat or Non NAT

Even with NAT, you can set up static routes on some routers to specific IP
addresses. So, if you have one IP address on the outside and several private
addresses on the inside, you can configure your router to pass all incoming
HTTP and FTP for instance to a specific address (your web server).

As mentioned in another reply, it would be quicker generally to have
multiple IPs and route directly.

MGS

"Tiscali Tim" wrote in message
...
In an earlier contribution to this discussion,
Mike Saunders wrote:

I am educating myself about routers, security etc and would like to
know what are the main reasons why you would not choose a NAT'd
router setup

Many thanks

Mike Saunders


Not an expert, but this is my understanding. With NAT, the individual IP
addresses of the PCs on your network are not visible to the outside

world -
which is fine for most domestic purposes. However, if you are hosting
services on individal PCs which need to be accessed from outside, the
individual IP addresses need to be visible, so you can't hide them behind
NAT.
--
Cheers,
Tim
______
Please reply to newsgroup. Reply address is Black Hole!




 




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