On Sun, Aug 4, 2019 at 8:31 AM DL Neil <pythonl...@danceswithmice.info> wrote: > > On 3/08/19 5:20 PM, Cameron Simpson wrote: > > On 03Aug2019 08:52, DL Neil <pythonl...@danceswithmice.info> wrote: > >> On 3/08/19 8:32 AM, Terry Reedy wrote: > >>> 2. Do two systems connect directly peer-to-peer or through a server? > >> Exclusively the latter (thus far in the investigation). > > > > If one party is remote and both are behind a NAT (_very_ common in > > Australia, for example) then you always need an external intermediary. > > Even if that intermediary does no more than connect some sockets from > > each end together and blindly pass traffic. > > As is the case with many of the A/V comms packages, if the software is, > or appears to be, a web-browser (IP port 80); then there should be no > particular problem with either NAT or firewalls.
That covers one end only - the "active" or "connecting" end. The other end has to be "passive" or "listening", and that is a lot harder to handle. Hence the need for the broker - one server has the listening ends for everyone, and all the actual Idle processes connect to that. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
