Re: IPfilter and Nintendo Switch

["Aaron B." <aaron%zadzmo.org@localhost>]

On Sat, 27 Feb 2021 07:57:46 +0100
Martin Husemann <martin%duskware.de@localhost> wrote:

> On Sat, Feb 27, 2021 at 07:44:51AM +0100, Emmanuel Dreyfus wrote:
> > The Nintendo Switch reports a B grade. However, I do not understand how
> > source ports can be preserved on a 1:n IP addresses mapping, I suspect
> > they get preserved most of the time?
> 
> I would guess the console tries to learn its outside port and IP and
> if it can not talk to a UPnP daemon on the router just tries a 1:1
> mapping.
> 

For what it's worth, after extensive expirements and time in tcpdump, I
found no evidence that the Nintento Switch uses UPnP.

I can't rule out I was doing something wrong, but eventually I just
turned off UPnP altogether.

-- 
Aaron B. <aaron%zadzmo.org@localhost>