RE: Numbers of NAT-s in IPv4/IPv6 Network? One or more?

[<Andreas.Schmid1@swisscom.com>]

> > (Then, you get into questions as to whether the multiple NATs are 
> > there for something simple like load balancing/fault 
> tolerance, or for 
> > something more complex like site multi-homing.)
> 
> marketed as load balancing / fault tolerance.
> 
> Besides the case of multiple NATs working "parallel", I have 
> also seen cases where multiple NATs where daisy-chained 
> (wireless network being NATted to the fixed in-house network, 
> which in turn was NATted to one outside IP).  Ugly, but real.

Dual NATs are also widely used in the home. If somebody buys first a
DSL/Cable modem/router (first NAT) and then adds a WLAN router (second
NAT) and doesn't change the default configuration then there are already
2 NATs. I guess that a lot of home users don't have the knowledge to
change default configurations and therefore have such a configuration.

Andreas