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Re: changing local domain name

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, and apart from what's out there on the Internet I have
hosts foo.example.org at and bar.example.org at
with a router at What do I need to do? For simplicity, I
use dhcp from the router which also has no DNS server. So /etc/hosts.