Private address and static IP as an commercial offer.

Alex French wrote:
> 
> At 08:48 18/06/2001, Randy Bush wrote:
> > > The policy is "tell people that NAT exists, explain to them what the
> > > benefits are
> >
> >what benefits are there?
> 
> In practice, a major benefit to using NAT is that it doesn't require the
> co-operation of either the ISP or the registry. For many small/medium
> enterprises, the turnaround time and extra form filling to obtain an
> assignment aren't worth it, especially when combined with the other
> benefits to NAT mentioned here.
> 
> Alex.

Hello all,

Working for an ISP I find that NAT is advantageous over legitimate
addressing for several reasons.

The first is that which Alex mentioned, no paperwork = no delay. The
wait queue at the Ripe NCC can be lengthy sometimes.
Secondly, address space conservation, as far as our own /19 allocation
is concerned we can more effectively use this space for those that truly
need legitimate address space. The majority of commercial connections
need at best a /29 or /28 for a mail server and or a web server the rest
of their lan is usually either behind a firewall or nat'd on the router.
Thirdly security. We used double NAT for firewalling customers, meaning
the firewall is nat'd at the router and the local lan is nat'd behind
the firewall. With access lists on the router this increases the
security by adding more layers to the security model, rather than hard
shell soft centre.

I always ask the customer to think about what they really need
legitimate addressing for. 99% of the time they just have no need for
public address space.  

just my 2p's worth! (or 2cents or .02 euros worth)

-- 
Mark S. Guz
Senior System/Network Engineer
IT

Scotland On Line
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