Re: question about net address

From	Joe <joe@jretrading.com>
Newsgroups	linux.debian.user
Subject	Re: question about net address
Date	2023-03-19 11:40 +0100
Message-ID	<GaYCd-dxPE-5@gated-at.bofh.it> (permalink)
References	<GaCV3-dkb8-5@gated-at.bofh.it> <GaN45-dqtO-1@gated-at.bofh.it> <GaOjv-drce-1@gated-at.bofh.it> <GaY9b-dxET-1@gated-at.bofh.it> <GaYsx-dxM7-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Sun, 19 Mar 2023 18:28:40 +0800
coreyh@free.fr wrote:

> On 19/03/2023 18:00, David Christensen wrote:
> > On 3/18/23 16:31, coreyh@free.fr wrote:  
> >> On 19/03/2023 06:17, Kushal Kumaran wrote:  
> >>> On Sat, Mar 18 2023 at 07:28:23 PM, coreyh@free.fr wrote:  
> >>>> Hello
> >>>> 
> >>>> I know 192.168.1.0/24 is a valid C range for network address.
> >>>> 
> >>>> but what does 192.168.1.1/24 mean?
> >>>> 
> >>>> I ask this just for a setting in the SPF:
> >>>> 
> >>>> spf.pinoad.se.        300    IN    TXT    "v=spf1
> >>>> ip4:188.66.63.1/24 -all"
> >>>>   
> >>> 
> >>> It means the same thing.  192.168.1.1/24 is the same range as
> >>> 192.168.1.0/24, but written by someone not paying too much
> >>> attention.  
> >> 
> >> 
> >> That's correct. Thanks.  
> > 
> > 
> > AIUI:
> > 
> > * 192.168.1.0/24 identifies an IPv4 network with an address of
> > 192.168.1.0 and a network prefix of 24 bits.  The address is within
> > the reserved private block 192.168.0.0/16.  The prefix corresponds
> > to a class C network.
> > 
> > * 192.168.1.1/24 identifies an IPv4 network interface with an
> > address of 192.168.1.1 and a network prefix of 24.  The interface is
> > configured to communicate over the 192.168.1.0/24 network.
> > 
> > 
> >   
> 
> So for Inleed (a local ISP)'s SPF:
> 
> spf.pinoad.se.		300	IN	TXT	"v=spf1
> ip4:188.66.63.1/24 -all"
> 
> 
> They specify only 188.66.63.1 to send email?
> 
> But as far as I know their mailserver is 188.66.63.2:
> 
> mail.inleed.xyz.	300	IN	A	188.66.63.2
> 
> 
> Then this mail server should have problems in messages delivery.
> 
>
Mail to/from a domain does not have to be sent by the same host as the
one which receives it. They may be the same computer, they may be
servers on different continents belonging to different companies.

Many businesses use a mail-cleaning service of some kind for received
mail, and many who receive mail directly send their outgoing mail
through their ISP or domain host.

-- 
Joe

Thread

question about net address coreyh@free.fr - 2023-03-18 12:30 +0100
  Re: question about net address Markus Schönhaber <debian-user@list-post.mks-mail.de> - 2023-03-18 13:40 +0100
  Re: question about net address Timothy M Butterworth <timothy.m.butterworth@gmail.com> - 2023-03-18 14:30 +0100
  Re: question about net address Kushal Kumaran <kushal@locationd.net> - 2023-03-18 23:20 +0100
    Re: question about net address coreyh@free.fr - 2023-03-19 00:40 +0100
      Re: question about net address David Christensen <dpchrist@holgerdanske.com> - 2023-03-19 11:10 +0100
        Re: question about net address coreyh@free.fr - 2023-03-19 11:30 +0100
          Re: question about net address Joe <joe@jretrading.com> - 2023-03-19 11:40 +0100
          Re: question about net address Jeremy Ardley <jeremy@ardley.org> - 2023-03-19 11:40 +0100
            Re: question about net address coreyh@free.fr - 2023-03-19 11:40 +0100
              Re: question about net address jeremy ardley <jeremy@ardley.org> - 2023-03-19 11:50 +0100
              Re: question about net address <tomas@tuxteam.de> - 2023-03-19 12:10 +0100
              Re: question about net address Greg Wooledge <greg@wooledge.org> - 2023-03-19 13:20 +0100
                Re: question about net address Curt <curty@free.fr> - 2023-03-19 18:20 +0100
                Re: question about net address David Wright <deblis@lionunicorn.co.uk> - 2023-03-19 19:50 +0100
              Re: question about net address Stefan Monnier <monnier@iro.umontreal.ca> - 2023-03-19 16:00 +0100
            Re: question about net address Yassine Chaouche <a.chaouche@algerian-radio.dz> - 2023-03-19 12:10 +0100
              Re: question about net address <tomas@tuxteam.de> - 2023-03-19 12:20 +0100
              Re: question about net address <tomas@tuxteam.de> - 2023-03-19 12:20 +0100
                Re: question about net address Nicolas George <george@nsup.org> - 2023-03-19 12:20 +0100
                Re: question about net address Jeremy Ardley <jeremy@ardley.org> - 2023-03-19 12:40 +0100
                Re: question about net address Nicolas George <george@nsup.org> - 2023-03-19 12:50 +0100
                Re: question about net address Greg Wooledge <greg@wooledge.org> - 2023-03-19 13:30 +0100
                Re: question about net address David Wright <deblis@lionunicorn.co.uk> - 2023-03-19 18:30 +0100
                Re: question about net address David Wright <deblis@lionunicorn.co.uk> - 2023-03-19 19:50 +0100
                Re: question about net address Jeremy Ardley <jeremy@ardley.org> - 2023-03-20 00:40 +0100
                Re: question about net address fh@dnsbed.com - 2023-03-20 01:30 +0100
                Re: question about net address Stefan Monnier <monnier@iro.umontreal.ca> - 2023-03-21 23:30 +0100
                Re: question about net address Jeremy Ardley <jeremy@ardley.org> - 2023-03-22 00:00 +0100
                Re: question about net address David Wright <deblis@lionunicorn.co.uk> - 2023-03-22 00:50 +0100
                Re: question about net address David Wright <deblis@lionunicorn.co.uk> - 2023-03-22 15:50 +0100
                Re: question about net address Jeremy Ardley <jeremy@ardley.org> - 2023-03-19 12:40 +0100
                Re: question about net address Yassine Chaouche <a.chaouche@algerian-radio.dz> - 2023-03-19 13:10 +0100
                Re: question about net address Curt <curty@free.fr> - 2023-03-19 18:10 +0100
              Re: question about net address fh@dnsbed.com - 2023-03-19 12:40 +0100
                Re: question about net address <tomas@tuxteam.de> - 2023-03-19 13:00 +0100
              Re: artifiial intelligence (was: Re: question about net address) Yassine Chaouche <a.chaouche@algerian-radio.dz> - 2023-03-20 10:30 +0100
          Re: question about net address David Christensen <dpchrist@holgerdanske.com> - 2023-03-19 23:20 +0100
  Re: question about net address Yassine Chaouche <a.chaouche@algerian-radio.dz> - 2023-03-19 10:00 +0100
    Re: question about net address Yassine Chaouche <a.chaouche@algerian-radio.dz> - 2023-03-19 10:10 +0100
    Re: question about net address debian-user@howorth.org.uk - 2023-03-19 17:50 +0100

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