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Re: Some basic router questions and zoom

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On 2020-12-17, Bit Twister <BitTwister@mouse-potato.com> wrote:
> On Thu, 17 Dec 2020 22:49:44 -0000 (UTC), William Unruh wrote:
>> No, that is not your internet address. That is the internet of the
>> address of your router or of the ISPs router, depending on how to handle
>> things.
>> ifconfig -a
>> will give you your computer's IP address. And that is usually a
>> non-routable address like 10.x.x.x or 192.168.x.x.
>>
>> The "internet address" as you define it will be the same for all of the
>> computers in your own local network. For example on my system, I get
>>  75.155.y.y for all of the computers on my home network, where y.y is
>>  the same for all of them.
>>
>>  That address is the address of the router that connects me to the
>>  internet.
>
> Heheh, we are in a violent agreement that if you want to connect to another
> site/user on the Internet you have to use the Internet Ip Address.
> If you want to connect with anyone on LAN side you have to use the LAN
> ip address.
>
Well, I would phrase it differently. If someone wants to connect with you
they have to use the internet address of the router that connects you to
the internet. If someone inside your network want to connect to you then
have to use the IP of your machine. Unfortunately the formet only gets
you to the router, not to your machine, and there are many computers on
the inside of the router. How can the packet get from the outside to
your particular machine? At first approximation it cannot. At second
approximation you could have told the router that any packet arriving at
router at port X should be delivered to your machine at port Y. (but
that would mean that port X has to uniquely be connected to port Y on
your machine.). This brings in the third approximation. If you send out
a request to a remote machine on port Z, which the router translates to
port ZZ, then if the router receives a packet from that machine directed
to port ZZ it will deliver it to your machine on port Z. Ie, this is
just like case 2 except that you do not have to set up the port
forwarding yourself, it is set up automatically by the router.

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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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