HELP: NAT or non-NAT?

Hi There,

I would be obliged if anyone has advice on whether the 'NAT' or 'non NAT'
option is best for broadband, I take it this pertains to a router? - it is
simply to link 2-3 PC's in a small office and to share an internet ADSL
connection between the 2 or 3 - 2 of the PC's are already networked using 2
PCI Network cards.

Could anyone explain what the advantages/disadvantages would be please.

Many thanks in advance

·.¸¸.·´¯`·.¸¸.· Doctor Troy ====]>

'Light travels faster than sound, that's why
people appear bright until you hear them speak.'

In article <4084e952$0$95280$(E-Mail Removed)>, "·.¸¸.·´¯`·.
¸¸.· Doctor Troy ====]>" (E-Mail Removed) says...
> Hi There,
>
> I would be obliged if anyone has advice on whether the 'NAT' or 'non NAT'
> option is best for broadband, I take it this pertains to a router? - it is
> simply to link 2-3 PC's in a small office and to share an internet ADSL
> connection between the 2 or 3 - 2 of the PC's are already networked using 2
> PCI Network cards.
>
> Could anyone explain what the advantages/disadvantages would be please.
>
Not quite sure what you're asking here. To share an internet connection
between several machines when you only have one public IP address you
either run a NAT router (software or hardware) or a proxy server.
Is your supplier offering multiple public IP adresses? Or do they just
want to charge you more for having more than one machine connected?

Sorry, it's at the stage where we have to pick a modem with a BB provider -
someone advised someone else to use one with NAT? ... there will be no
websites or any mail servers being run, just a simple sharing of BB
resources ... so IP's addresses shouldn't really matter .... or should they
!!!

Regards

·.¸¸.·´¯`·.¸¸.· Doctor Troy ====]>

'Light travels faster than sound, that's why
people appear bright until you hear them speak.'

"Rob Morley" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed) t...
> In article <4084e952$0$95280$(E-Mail Removed)>, "·.¸¸.·´¯`·.
> ¸¸.· Doctor Troy ====]>" (E-Mail Removed) says...
> > Hi There,
> >
> > I would be obliged if anyone has advice on whether the 'NAT' or 'non
NAT'
> > option is best for broadband, I take it this pertains to a router? - it
is
> > simply to link 2-3 PC's in a small office and to share an internet ADSL
> > connection between the 2 or 3 - 2 of the PC's are already networked
using 2
> > PCI Network cards.
> >
> > Could anyone explain what the advantages/disadvantages would be please.
> >
> Not quite sure what you're asking here. To share an internet connection
> between several machines when you only have one public IP address you
> either run a NAT router (software or hardware) or a proxy server.
> Is your supplier offering multiple public IP adresses? Or do they just
> want to charge you more for having more than one machine connected?

> Sorry, it's at the stage where we have to pick a modem with a BB
> provider - someone advised someone else to use one with NAT? ...
> there will be no websites or any mail servers being run, just a
> simple sharing of BB resources ... so IP's addresses shouldn't really
> matter .... or should they !!!
>
As you will probably only have one public address then you will need a
router that does NAT.
--
Alex

"We are now up against live, hostile targets"

"So, if Little Red Riding Hood should show up with a bazooka and a bad
attitude, I expect you to chin the bitch! "

www.drzoidberg.co.uk
www.upce.org.uk

In article <40855af5$0$39201$(E-Mail Removed)>, "·.¸¸.·´¯`·.
¸¸.· Doctor Troy ====]>" (E-Mail Removed) says...
> "Rob Morley" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed) t...
> > In article <4084e952$0$95280$(E-Mail Removed)>, "·.¸¸.·´¯`·.
> > ¸¸.· Doctor Troy ====]>" (E-Mail Removed) says...
> > > Hi There,
> > >
> > > I would be obliged if anyone has advice on whether the 'NAT' or 'non
> NAT'
> > > option is best for broadband, I take it this pertains to a router? - it
> is
> > > simply to link 2-3 PC's in a small office and to share an internet ADSL
> > > connection between the 2 or 3 - 2 of the PC's are already networked
> using 2
> > > PCI Network cards.
> > >
> > > Could anyone explain what the advantages/disadvantages would be please.
> > >
> > Not quite sure what you're asking here. To share an internet connection
> > between several machines when you only have one public IP address you
> > either run a NAT router (software or hardware) or a proxy server.
> > Is your supplier offering multiple public IP adresses? Or do they just
> > want to charge you more for having more than one machine connected?
>
> Sorry, it's at the stage where we have to pick a modem with a BB provider -
> someone advised someone else to use one with NAT? ... there will be no
> websites or any mail servers being run, just a simple sharing of BB
> resources ... so IP's addresses shouldn't really matter .... or should they
> !!!>
>
Okay, I see where you're coming from. The modem itself doesn't do NAT,
but if you get a combined modem/router/switch that will do what you
want. The PCs plug into the switch to talk to each other, the router
handles the NAT and the modem connects to the internet.
There are plenty available from around £50.

"·.¸¸.·´¯`·.¸¸.· Doctor Troy ====]>" <(E-Mail Removed)> wrote in
message news:4084e952$0$95280$(E-Mail Removed)...
| Hi There,
|
| I would be obliged if anyone has advice on whether the 'NAT' or 'non NAT'
| option is best for broadband, I take it this pertains to a router? - it is
| simply to link 2-3 PC's in a small office and to share an internet ADSL
| connection between the 2 or 3 - 2 of the PC's are already networked using
2
| PCI Network cards.
|
| Could anyone explain what the advantages/disadvantages would be please.
|
| Many thanks in advance
|

Advantages of NAT:
PCs behind the NAT router are not visible from the outside so are
"firewalled" to some degree.
You only need one IP address which can be dynamic. This can be cheaper with
some ISPs than having a static address.

Disadvantages of NAT:
Harder to run servers without the right hardware

Advantages of non-NAT:
You can run servers on your public IP addresses (although this can be
achieved on NAT boxes too if the firewall can provide port forwarding)
Some applications, especially the likes of netmeeting or video conferencing,
work better over non-NAT.

Disadvantages of non-NAT:
Firewall required as all hosts are visible.
IP address needed for each PC (can be more expensive)

All in all, I'd recommend NAT but try and get a static IP address so that
you can host servers using port forwarding if required.

Grant

Thanks guys for your help.

Regards

·.¸¸.·´¯`·.¸¸.· Doctor Troy ====]>

'Light travels faster than sound, that's why
people appear bright until you hear them speak.'

If you haven't already, take a look at www.freedom2surf.net were rated
fairly highly by Which at one point. are low cost, many options
(including extra IP addresses for non-nat) for a fiver a month. and
always a static IP.
Have to live in an ADSL area tho.
G

"·.¸¸.·´¯`·.¸¸.· Doctor Troy ====]>" <(E-Mail Removed)> wrote
in message news:4085a629$0$10249$(E-Mail Removed)...
> Thanks guys for your help.
>
> Regards
>
> ·.¸¸.·´¯`·.¸¸.· Doctor Troy ====]>
>
> 'Light travels faster than sound, that's why
> people appear bright until you hear them speak.'
>
>

On Tue, 20 Apr 2004 18:18:28 +0100, ·.¸¸.·´¯`·.¸¸.· Doctor Troy
====]> wrote:

> Sorry, it's at the stage where we have to pick a modem with a BB provider
> - someone advised someone else to use one with NAT? ... there will be no
> websites or any mail servers being run, just a simple sharing of BB
> resources ... so IP's addresses shouldn't really matter .... or should
> they !!!

If you have to get your own, don't go near PC World, Dixons etc. Go look
at

www.adslguide.org

or look at previous threads of routers on here.

cheers

Dave

"·.¸¸.·´¯`·.¸¸.· Doctor Troy ====]>" <(E-Mail Removed)> wrote in message news:<40855af5$0$39201$(E-Mail Removed)>. ..
> Sorry, it's at the stage where we have to pick a modem with a BB provider -
> someone advised someone else to use one with NAT? ... there will be no
> websites or any mail servers being run, just a simple sharing of BB
> resources ... so IP's addresses shouldn't really matter .... or should they
> !!!
>
><SNIP>
Ok that is simple.
All you need is a BB supplier with either static or dynamic it
shouldnt matter and network your lan using the dhcp server on the
combined modem/router and if they have laptops maybe with wireless as
well.

here is a basic diagram in ascii
Public IP address
Internet-----ADSL--->212.11.23.111|router|LAN|---192.168.10.10 pc1
192.168.10.1/ \__192.168.10.11 pc2
Gateway address \_192.168.10.12 pc3


Dont get the router from a BB supplier they will work out more costly
in most cases.

Ian
www.cyber-cottage.co.uk
www.bathford-broadband.co.uk