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Re: Some basic router questions and zoom

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On Thu, 17 Dec 2020 18:50:53 -0000 (UTC), William Unruh wrote:
> On 2020-12-17, Bit Twister <BitTwister@mouse-potato.com> wrote:

>>
>> Just like any home user has an internet ip address.
>
> Well, no. Your home could either be assigned a private address
> (10.x.x.x, 192.168.x.x) in which case I think it is impossible for an
> outsider to connect to your machine, or a public address (most of the
> other possibilities), in which case it knows exactly where to send the
> packet to.

Technically your description is correct inside the ISP network,
but you can get your internet address by running any of these in a terminal
     wget -qO - http://smxi.org/opt/ip.php
     curl http://icanhazip.co


>
> Those are the server's ports, not your ports. The two computers decide
> which port on your machine is to get the information. You initiate the
> zoom connection. Your computer sends a packet to the zoom server on some
> random port. Zoom then knows to reply to that random port if it wants to
> send something to your machine, and the NAT router knows which machine
> those reply packets are to go to.

> Becaue that machine your user used connected to the zoom server on some
> port, and the router knows that stuff coming back on that port should be
> directed to your machine.
>

>  It is going to establish a connection on some random port
> chosen by your machine. After the connection is established, the server
> may or may not use the those ports.
> (It is also possible that that your machine will establish connections
> on those zoom ports, and then, because the connection on those ports was
> instituted by your machine, the router knows to send replies back to
> you. In general the server will not see those ports at all. It will see
> a request from your machine whose port has been translated by the NAT to
> some random port and the zoom server will only see that random port.
> There are only 64000 ports, so if you have 64000 machines on your end
> all trying to be NATed, the NAT router will run out of ports, and you
> will have a mess. ( There are 2^24 address in 10.x.x.x and only 2^16
> (64000) ports, but I doubt that you are in that situation. I do not know
> IPV6 has more port possibilities.

Ok, that makes sense, somewhat, and if so, then I understand how any
user at work/school can enter a Zoom meeting.

My questions come from reading about having to whitelist Zoom servers.
Your description seems to indicate all communication is though
connections made by Zoom client on the computer.

Hopefully my webcam gets here this week and my meeting test should have
no problems.

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Thread

Some basic router questions and zoom Bit Twister <BitTwister@mouse-potato.com> - 2020-12-16 09:54 -0600
  Re: Some basic router questions and zoom "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2020-12-16 12:57 -0500
  Re: Some basic router questions and zoom Pascal Hambourg <pascal@plouf.fr.eu.org> - 2020-12-17 17:38 +0100
    Re: Some basic router questions and zoom Bit Twister <BitTwister@mouse-potato.com> - 2020-12-17 11:55 -0600
      Re: Some basic router questions and zoom William Unruh <unruh@invalid.ca> - 2020-12-17 18:50 +0000
        Re: Some basic router questions and zoom Bit Twister <BitTwister@mouse-potato.com> - 2020-12-17 15:07 -0600
          Re: Some basic router questions and zoom William Unruh <unruh@invalid.ca> - 2020-12-17 22:49 +0000
            Re: Some basic router questions and zoom Bit Twister <BitTwister@mouse-potato.com> - 2020-12-17 17:14 -0600
              Re: Some basic router questions and zoom William Unruh <unruh@invalid.ca> - 2020-12-18 00:04 +0000
                Re: Some basic router questions and zoom "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2020-12-17 19:54 -0500
                Re: Some basic router questions and zoom Bit Twister <BitTwister@mouse-potato.com> - 2020-12-17 19:35 -0600
                Re: Some basic router questions and zoom Dick <rsutton43@comcast.net> - 2020-12-18 09:58 -0500
                Re: Some basic router questions and zoom Dick <rsutton43@comcast.net> - 2020-12-18 10:06 -0500
            Re: Some basic router questions and zoom Johann Beretta <beretta@nun-ya-bizness.com> - 2020-12-21 10:19 -0800

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