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Re: changing local domain name




On Saturday 31 March 2018 11:15:48 David Wright wrote:

> On Sat 31 Mar 2018 at 12:35:08 (+0100), Joe wrote:
> > On Fri, 30 Mar 2018 21:17:26 -0500
> >
> > David Wright <deblis@xxxxxxxxxxxxxxxxx> wrote:
> > > On Fri 30 Mar 2018 at 19:24:21 (+0100), Brian wrote:
> > > > I do not know where the OP is coming from or, without further
> > > > detail, where he wants to go.
> > >
> > > AIUI or thought I did, the OP wants to change their host foo's
> > > domainname from   foo.local   to   foo.home.
> > >
> > > > > > > On 2018-03-29, mick crane <mick.crane@xxxxxxxxx> wrote:
> > > > > > > > It's not just domainname and /etc/hosts.
> > >
> > >                         ↑↑↑↑↑↑↑↑↑↑
> > > I'm not sure what is meant here.
> > >
> > > > > > > > It's every frigging where.
> > >
> > > This surprises me.
> > >
> > > > > > > > apache
> > >
> > > Can't help with this.
> > >
> > > > > > > > roundcube
> > > > > > > > postfix
> > > > > > > > now my ISP SMTP server is moaning.
> > >
> > > It can't come as a surprise that one should reconfigure the email
> > > system (and network connection) after changing the name of the
> > > domain, and it shouldn't be that difficult.
> >
> > There is a deep well of ambiguity here, and inevitably it was dug by
> > Microsoft. From the beginning of networking in DOS, an MS computer
> > had an individual name and a group name. Initially the group was a
> > 'workgroup', then along came NT with its security/vendor-lock-in
> > feature of 'domains'. MS domains are basically Kerberos realms
> > underpinned by LDAP, and in their beginning, had no connection with
> > Internet domains. For the last decade or so, MS domains have been
> > somewhat aligned with Internet domains, and the Windows DNS server
> > is closely tied to the LDAP Active Directory.
> >
> > Over on this Path, domains have always been an Internet issue, for
> > finding servers and sending email. They do not have any real meaning
> > for Linux workstations. However, if CIFS is in use in a network,
> > most of its tools will want the name of a workgroup or domain, for
> > interoperation with Windows machines, of which Samba is a
> > simulation.
>
> I hadn't given that any consideration. Somehow I thought anyone in the
> OP's situation would probably have any MS "domain" set to WORKGROUP.
>
> > A
> > working Internet mail server will also need to know its domain
> > name(s) and will itself have at least one public FQDN, but there's
> > no reason why any of the domain names it serves need to have any
> > CIFS awareness or connection with a Windows or other local domain
> > name. My mail server at present handles three public domains, only
> > one of which I use locally. If a DNS server is in use in even a
> > small network, again this will need a domain name.
>
> I think we can discount that if the user's FQDN was foo.local.
>
> I think both you and I may be overthinking the OP's comment above,
> which reads like a tautology: to change the domainname, you need to
> change the domainname.
>
> > It is a matter of practicality, therefore, to give a private network
> > a domain name.
>
> So it's said, but the nature of these practicalities hasn't exactly
> been forthcoming in the long thread that's been running two months
> (apart from getting a dot in the FQDN).
>
> > If you lease a public domain name, there is no real
> > difficulty about using it also in a private network, just a matter
> > of making sure that external resources using the name can also be
> > found in local DNS or hosts files.
>
> If you could elaborate. Say I have leased example.org, currently at
> 93.184.216.34, and apart from what's out there on the Internet I have
> hosts foo.example.org at 192.168.1.2 and bar.example.org at
> 192.168.1.3 with a router at 192.168.1.1. What do I need to do? For
> simplicity, I use dhcp from the router which also has no DNS server.
> So /etc/hosts.
>
> Cheers,
> David.

Some of the above just added scenarios will require NATing in the router 
in order for external access to work.


-- 
Cheers, Gene Heskett
--
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