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

[<Jonne.Soininen@nokia.com>]

Hi,

there also seems to be cases where the ISP nats the internet access and the home user has multiple computers behind a NAT. In this case it is not only an accident, but done in purpose. Though, it as ugly if it is done on purpose or not.

Cheers,

Jonne.

> -----Original Message-----
> From: ext [mailto:Andreas.Schmid1@swisscom.com]
> Sent: 16 September, 2003 09:37
> To: gert@space.net; ftemplin@iprg.nokia.com
> Cc: damir.bilajbegovic@siemens.com; v6ops@ops.ietf.org
> Subject: RE: Numbers of NAT-s in IPv4/IPv6 Network? One or more?
> 
> 
> > > (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
> 
>