On Mon 19 Feb 2018 at 10:23:56 -0600, David Wright wrote:

> On Mon 19 Feb 2018 at 12:28:03 (+0000), Jeremy Nicoll wrote:
> > On Thu, 15 Feb 2018, at 16:21, Dan Purgert wrote:
> > 
> > > > Later, once you understand how a local network works, you can come
> > > > up with a theme.  Or some convention that lets you identify the
> > > > computer by its name.  The name that you have chosen.
> > 
> > Machine-naming makes sense to me - having done that with a variety
> > of (blush) Windows machines in my LAN.  I've toyed with versions of 
> > Linux, and used a few live-CD ones over the years, and I'm fairly sure
> > that as well as being asked to supply a hostname I've also been asked 
> > to supply a domain value.
> > 
> > What, on a home LAN, is that used for?
> 
> Nothing, with the possible exceptions of:
> 
> . avoiding this message at boot up:
>   Mon Feb 19 04:58:38 2018: [....] Starting MTA:hostname --fqdn did not 
> return a fully qualified name,
>   Mon Feb 19 04:58:38 2018: dc_minimaldns will not work. Please fix your 
> /etc/hosts setup.
> 
> . satisfying a broken smarthost┬╣,
> 
> . causing some discussion here.
> 
> However, even though bug #504427 has never been answered, I don't
> think I'm seeing this message any more except on wheezy (as above).
> So here I have:
> 
> $ cat /etc/mailname 
> alum

Debian's exim4 README says that mailname should be a FQDN. I find that
useful for sending mail to "anotheruser". But mailname has nothing to
do with domain as enquired about by Jeremy Nicoll.

> $ head /etc/hosts
> # /root/hosts-1-local-template
> # List of local hosts.
> # Adjust the two lines for this host when installing.
> # Check the IPv6 lines occasionally because they change them.
> 
> 127.0.0.1       localhost
> 127.0.1.1       alum

alum is the canonical_hostname. It is used by exim to HELO with. Many
mail servers will not accept mail directly from you because it is not a
FQDN.
 
> 192.168.1.1     router
> 192.168.1.2     roku2w
> $ 
> 
> I've sometimes wondered what other people dream up as their
> domainnames; that is, people who don't have a legitimate reason
> to put something like example.com.

Whatever is dreamt up as a domain name is put into /etc/hosts by the
installer as

127.0.1.1   alum.dreamtup    alum

-- 
Brian.

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