Post by Frank Post by Tim via users
Just out of curiosity, is it only applying localhost.localdomain to
your 127.0.0.1 loopback interface (like it should), or is it trying
to apply it to an ethernet or wifi interface (which it shouldn't)?
You didn't answer the above query.
Post by Frank
Here's the situation this morning. Following a suggestion from John Quirke
I added a line to /etc/NetManager/NetManager.conf hostname-mode=none.
That has stopped the repeated logging, but now when I click on the
netmanager icon in the tray it tells me the network has been
disconnected. Actually it hasn't been so I don't know what is up with that.
I also do not understand why the repeated logging started as no
changes were made to anything network-related.
Perhaps you should reboot your router. Maybe it glitched.
Maybe you should remove the connection info network manager has set for
your interface, and let it freshly create a new one from your DHCP
Post by Frank
This is now my hosts file in /etc
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
I do not understand the references to localhost4 and localhost6 in
That looks fine. The localhost 4 and 6 gubbins seems to be some new-
fangled stuff that someone thinks is a good idea. I've never heard of
anything using it.
The local loopback interface is on 127.0.0.1, and is traditionally
given the hostname "localhost". For some reason, Linux adds an extra
localhost.localdomain alias to it, perhaps to satisfy some daemons that
insist on having at least one dot in a hostname.
The loopback interface is how the computer communicates within itself.
If there's any purely internal network traffic inside the computer, it
doesn't even go through any of the network hardware. And it uses that
IP address, and gives it a "localhost" name. It's like you looking at
yourself in the mirror and saying, "that's me," talking inside your
Other interfaces (ethernet or wifi) should have their own completely
independent IP addresses and hostnames. i.e. They should *NOT* be
called localhost. If your DHCP server is working right, it should all
this properly for you.
Post by Frank
I connect to the internet on a wired connection to my providers
router via DHCP. There is no wireless or other networks involved.
A DHCP server should give you an IP, hopefully (for you) the same one
each time. And it may also give that interface a hostname. It may
not, some routers only do a half-hearted job at it.
The https://unix.stackexchange.com/a/513413/452882 link provided
earlier tries to stop your computer listening the DHCP server regarding
a hostname. Essentially the idea is that you name the computer
yourself, and hope to keep a consistent hostname. That link then goes
on about them getting the computer to be localhost and
localhost.localdomain, on the non localhost interface which is leading
a networking nightmare.
If you can, configure your router to give you an IP and hostname. If
you can't, then configure your computer to have its own hostname, and
don't call it localhost, nor localhost.localdomain. Normally, I've
found Fedora would carry on using your assigned hostname if nothing
else changed it. i.e. A DHCP server that only gives you an IP without
a name, will give you an IP, and you'll keep using the hostname you
Try reading "man hostname" about manually setting a hostname (I reckon
you'll *need* to "su -" and do this as the root user, or through sudo).
When a computer doesn't have a hostname, and hasn't been given one to
use, one thing it can do is a reverse lookup on its assigned IP.
e.g. Your DHCP server says: you are 192.168.1.23
Your computer asks its DNS server, what's the name for 192.168.1.23
Your DNS server says that's: george.example.com
Your computer refers to itself as george (the hostname) and
george.example.com (as a fully-qualified domain name).
Without a fully functional DHCP server, and a co-operating DNS server
(your ISP's won't help, its outside of your DHCP server), you'll have
to manage some of that yourself. And that's much easier if your
computer always gets given the same IP address. A simple approach is
to use the hostname command to name your computer, and put its name
into your /etc/hosts file.
e.g. Under the two existing lines, add something like:
or, like this:
192.168.1.23 george george.example.com
The first info is your IP, use *YOUR* actual IP.
The thing next to it (george) is the name you want it known as.
It can be followed by aliases (alternative names it can respond to).
Now your computer will consult its hosts file to find its name, rather
than try to get an answer from a DNS server that isn't going to give it
If your computer is the only thing on your network (after the router),
you could just set a manual address and completely ignore DHCP. You
can do that through the NetworkManager interface. Pick an IP that's
not in use, and in the same range as the router.
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