Common operational misconceptions

Josh Hoppes josh.hoppes at
Fri Feb 17 01:16:36 UTC 2012

2012/2/16 Masataka Ohta <mohta at>:
> Andreas Echavez wrote:
>> *How NAT breaks end-to-end connectivity (fun one..., took me
>>  hours to explain to an old boss why doing NAT at the ISP level
>>  was horrendously wrong)
> That's another misconception.
> While NAT breaks the end to end connectivity, it can be
> restored by end systems by reversing translations by NAT,
> if proper information on the translations are obtained
> through some protocol such as UPnP.
>                                        Masataka Ohta

UPnP can scale to about the size of an average home use, but it's
worth jack squat at the ISP level when NAT44 comes into play. UPnP is
not an ISP grade solution, it's a consumer one.

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