[Courses] [Security] Firewall theory -- UDP and nameservers

[hobbit at aloss.ukuu.org.uk]

On Fri, Mar 22, 2002 at 10:18:02AM -0800 or thereabouts, jennyw wrote:
> There are several types of NAT. The one that's been mentioned so far is also
> called IP masquerading or hiding NAT -- where one external IP is exposed to
> the rest of the world. All outgoing traffic on a network (or from specified
> sets of IP addresses) appear to come from this IP address.  All traffic
> coming back in will be sent to the appropriate computer based on the source

Ohhh! 

IP masquerading I do know. Well, I know of it, and what it does. And
I know where the HOWTOs are :) 

> port, as someone mentioned earlier. There's also IP forwarding (also called
> static NAT), which is where you have an external IP that may be forwarded to
> an internal IP. For example, routable address a.b.c.d might be routed to
> 192.168.1.4, which could be a Web server. This is common for computers
> living in a DMZ. Port forwarding is another type of NAT. You could forward
> a.b.c.d:80 to one machine and a.b.c.d:25 to another machine.

...and um, I've used IP forwarding, too.

So those are NAT?

Duh. All is explained. Thank you :)

Telsa