On Jul 25, 2019, at 5:42 PM, Nataraj <incoming-cen...@rjl.com> wrote:
> 
> On 7/25/19 4:31 PM, Nataraj wrote:
>> It doesn't really help those clients I can not run name servers on,
>> though.
> 
> Another alternative is to look at the multicast dns (mdns) protocol.

That’s for allowing a device to self-advertise its own name, along with other 
things, like available services.  If you have such devices, then configuring 
the other machines on the network to pay attention to such advertisements 
allows them to see the new names and services when they appear.

…And much more importantly, when they *disappear*, since many 
ZeroConf/Bonjour/Avahi/mDNS speaking devices are mobile and aren’t always 
available.

This protocol is one common way for network printers to advertise their 
services, for example.  (The other common way is SMB/CIFS.)

> I'm pretty sure it's inplemented in avahi daemon

Yes, that’s an implementation of mDNS for POSIX type systems.  

> If your client supports
> it then I would think that all you have to do is enable it.

I’m not sure how this is relevant here.  For mDNS to be the solution to the 
OP’s problems, he’d have to also have mDNS multicasts going out advertising 
services, so the Avahi daemon would have something to offer when a compatible 
program comes along looking for services to connect to.

I suppose you could use mDNS in datacenter type environments, but it’s a long 
way away from the protocol’s original intent.

You could imagine a load balancer that paid attention to mDNS advertisements to 
decide who’s available at the moment.  But I don’t know of any such 
implementation.
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