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Re: Simple Linux to Linux(Debian) email

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On Tue, Apr 09, 2019 at 02:34:30AM +0200, Jan Claeys wrote:
> On Mon, 2019-04-08 at 21:33 +0900, Mark Fletcher wrote:
> > I've created a very simple script that is capable of parsing the
> > output of "ip addr" and comparing the returned ip address for the
> > relevant interface to a stored ip address, and thus being able to
> > tell if the IP address has changed. What I'd like to do now is make a
> > means for the LFS box to be able to notify me of the fact that the
> > external-facing IP address has changed. 
> 
> Why not use a dynamic DNS provider?
> 
> 
Primarily because it wouldn't solve my problem. IIUC it would allow me 
to map a domain name to the IP address assigned to my home internet 
connection. That means that when the IP address assigned to my internet 
connection changes, I can simply alter the mapping and my VPN clients 
start working again, without any configuration change on them. Great, 
but that isn't the problem. The problem is how I know that the IP 
address has changed and hence the DNS mapping needs updating. I don't 
see any way that a dynamic DNS service is going to know when my ISP 
arbitrarily re-assigns my IP. I need the machine that is being assigned 
the IP address to be able to tell me when it changes, and that is what 
this thread was about (specifically the "how it would be able to tell 
me" -- I'd figured out the "how it would know" for myself).

But thanks for trying to help anyway!

Mark

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Thread

Simple Linux to Linux(Debian) email Mark Fletcher <mark27q1@gmail.com> - 2019-04-08 14:40 +0200
  Re: Simple Linux to Linux(Debian) email Thomas Pircher <thp+debian@p5r.uk> - 2019-04-08 15:20 +0200
    Re: Simple Linux to Linux(Debian) email Mark Fletcher <mark27q1@gmail.com> - 2019-04-08 15:50 +0200
    Re: Simple Linux to Linux(Debian) email Celejar <celejar@gmail.com> - 2019-04-09 01:00 +0200
    RESOLVED: Simple Linux to Linux(Debian) email Mark Fletcher <mark27q1@gmail.com> - 2019-04-11 18:10 +0200
  Re: Simple Linux to Linux(Debian) email Ryan Nowakowski <tubaman@fattuba.com> - 2019-04-08 15:30 +0200
    Re: Simple Linux to Linux(Debian) email Mark Fletcher <mark27q1@gmail.com> - 2019-04-08 15:40 +0200
  Re: Simple Linux to Linux(Debian) email Joe <joe@jretrading.com> - 2019-04-08 15:40 +0200
    Re: Simple Linux to Linux(Debian) email Mark Fletcher <mark27q1@gmail.com> - 2019-04-08 16:40 +0200
  Re: Simple Linux to Linux(Debian) email <tomas@tuxteam.de> - 2019-04-08 17:50 +0200
    Re: Simple Linux to Linux(Debian) email Erik Christiansen <dvalin@internode.on.net> - 2019-04-09 03:50 +0200
  Re: Simple Linux to Linux(Debian) email Jan Claeys <lists@janc.be> - 2019-04-09 02:40 +0200
    Re: Simple Linux to Linux(Debian) email Mark Fletcher <mark27q1@gmail.com> - 2019-04-11 17:50 +0200
      Re: Simple Linux to Linux(Debian) email Greg Wooledge <wooledg@eeg.ccf.org> - 2019-04-11 18:00 +0200
        Re: Simple Linux to Linux(Debian) email Mark Fletcher <mark27q1@gmail.com> - 2019-04-11 18:20 +0200
      Re: Simple Linux to Linux(Debian) email Greg Wooledge <wooledg@eeg.ccf.org> - 2019-04-11 18:10 +0200
        Re: Simple Linux to Linux(Debian) email mick crane <mick.crane@gmail.com> - 2019-04-11 18:20 +0200
          Re: Simple Linux to Linux(Debian) email mick crane <mick.crane@gmail.com> - 2019-04-12 10:00 +0200
            Re: Simple Linux to Linux(Debian) email Dan Purgert <dan@djph.net> - 2019-04-12 12:10 +0200
              Re: Simple Linux to Linux(Debian) email mick crane <mick.crane@gmail.com> - 2019-04-12 12:30 +0200
                Re: Simple Linux to Linux(Debian) email Dan Purgert <dan@djph.net> - 2019-04-12 13:10 +0200
                Re: Simple Linux to Linux(Debian) email Dan Ritter <dsr@randomstring.org> - 2019-04-12 14:00 +0200
                Re: Simple Linux to Linux(Debian) email Gene Heskett <gheskett@shentel.net> - 2019-04-12 14:40 +0200
                Re: Simple Linux to Linux(Debian) email mick crane <mick.crane@gmail.com> - 2019-04-12 15:30 +0200
                Re: Simple Linux to Linux(Debian) email Dan Purgert <dan@djph.net> - 2019-04-12 17:00 +0200
                Re: Simple Linux to Linux(Debian) email Celejar <celejar@gmail.com> - 2019-04-12 23:20 +0200
                Re: Simple Linux to Linux(Debian) email mick crane <mick.crane@gmail.com> - 2019-04-13 00:20 +0200
      Re: Simple Linux to Linux(Debian) email mick crane <mick.crane@gmail.com> - 2019-04-11 18:10 +0200
      Re: Simple Linux to Linux(Debian) email Dan Ritter <dsr@randomstring.org> - 2019-04-11 18:20 +0200
      Re: Simple Linux to Linux(Debian) email Jan Claeys <lists@janc.be> - 2019-04-11 19:10 +0200

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