On Sat, 27 Feb 2021 07:57:46 +0100 Martin Husemann <mar...@duskware.de> 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. <aa...@zadzmo.org>
