localhost or LAN addresses in /etc/hosts
cl at isbd.net
Mon Dec 15 19:50:19 UTC 2008
On Mon, Dec 15, 2008 at 02:44:28PM -0400, Derek Broughton wrote:
> > How is that any easier than simply giving the printer a static IP? I
> > have to faff about in the router's configuration to tell it to
> > associate the MAC addres with the printer, that's just *another* place
> > I have to do things.
> No, that's just the ONE place you have to do things. In the time you've
> been asking us how to do this with a piece of software that you had to
> add to your system, I could have done the setup dozens of times on a
... and, similarly, I could have done it by editing /etc/hosts.
> > I'm using dnsmasq to try and minimise that sort of hassle.
> How much hassle do you think you've minimized so far?
Lots! The *only* thing I need to change ever is /etc/hosts on one
machine. Just as easy (easier IMHO) as doing things via the web
(presumably) on a router *and* it gets backed up when I back up my
> > How is setting up MAC addresses to match devices in the router any
> > easier than editing /etc/hosts? That's where I really don't follow
> > what you're advising. As it is all I do is:-
> You HAVEN'T got it to work with /etc/hosts - specifically because you're
> trying to do something you can't do.
Who says - I seem to have it working fine now using dnsmasq and simple
names. I just guessed that I *could* remove the entries I was
originally asking about and it all works OK. It's what dnsmasq is
specifically designed to do as far as I understand it.
> > Set the printer (for example) to have a fixed IP of 192.168.1.40
> > Put "192.168.1.40 printer" in /etc/hosts on *one* system which
> > runs dnsmasq.
> Same on the router. You don't even _have_ to have the MAC address.
> > The printer never changes once its IP address is set, computers may
> > come and computers may go but that only needs doing once. Similarly
> > if I change the computer where dnsmasq is running all I need to do is
> > copy /etc/hosts and everything is done.
> So do things the hard way, then, but you'd rather argue with everybody
> who's telling you you simply _can't_ do it the way you want to. Your
> /etc/hosts can only have ONE (working) IP address for a single host.
That's what my original question was about. All I wanted to know was
whether I could remove the local host name from the 127.0.0.1 and
127.0.1.1 entries and leave it against the 192.168.1.4 entry. It
turns out that I *can* do this and everything works well with dnsmasq.
> And whether dnsmasq can handle hostnames without domains or not, you
> can't _treat_ "isbd" in a dns lookup from a client with no search
> domains set, the same as a hostname lookup in the local /etc/hosts.
> They're doing different things, that just happen to resolve to the same
> address when isbd _is_ your local host (and then only because local dns
> lookup generally checks your /etc/hosts first).
My /etc/hosts now has:-
127.0.0.1 localhost.localdomain localhost
192.168.1.1 vigor 2820n
192.168.1.4 home.isbd.net isbd 84-45-228-40.no-dns-yet.enta.net chris.isbd.net
... plus more lines.
If I say 'host isbd' on the garage system see what happens:-
chris at garage:~$ host isbd
isbd has address 192.168.1.4
chris at garage:~$
The garage system has a default /etc/hosts, I've added nothing to it.
So it seems to me I'm getting exactly what I need, a DNS system that
gives me valid LAN addresses for local names.
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