Re: domain names, was: hostname
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 smarthost¹,
>
> . 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.
Reply to: