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Groups > linux.debian.user > #207328
| From | Dan Ritter <dsr@randomstring.org> |
|---|---|
| Newsgroups | linux.debian.user |
| Subject | Re: Simple Linux to Linux(Debian) email |
| Date | 2019-04-11 18:20 +0200 |
| Message-ID | <xLKAF-KN-5@gated-at.bofh.it> (permalink) |
| References | <xKBJ7-6Bs-21@gated-at.bofh.it> <xKMXT-5se-3@gated-at.bofh.it> <xLK7D-kX-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Mark Fletcher wrote:
> 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).
... if the IP address is being changed by DHCP, do you suppose
your dhcp client has a hook to tell other things about it?
man dhclient-script
...
After all processing has completed, /sbin/dhclient-script checks for
the presence of an executable /etc/dhcp/dhclient-exit-hooks script,
which if present is invoked using the '.' command. All executable
scripts in /etc/dhcp/dhclient-exit-hooks.d/* are also invoked.
...
Not to mention:
man ddclient
...
DESCRIPTION
A perl based client to update your dynamic IP address at
DynDNS.com (or other dynamic DNS services such as Hammernode,
Zoneedit or EasyDNS), thus allowing you and others to use a fixed
hostname (myhost.dyndns.org) to access your machine. This client
supports both the dynamic and (near) static services, MX setting,
and alternative host. It caches the address, and only attempts
the update if the address actually changes.
...
-dsr-
Back to linux.debian.user | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll 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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