On 12/29/2016 01:12 PM, Stéphane Graber wrote:
On Thu, Dec 29, 2016 at 01:02:29PM -0200, Till Kamppeter wrote:
Is there no way to dynamically (with checking what is currently in use)
select a small free IPv4 address space? For example in the 10.0.0.0/8 range
there are probably only some 10.X.Y.0/24 subranges used. If not, which IPv6
range is free for such a dummy0 interface? As it is local only and current
Linux supports IPv6 by default it would be no problem to be IPv6-only. It
would also need a host name as IPv6 IP addresses are awkward.
There is no way to do so for IPv4 as even if you check your local
interfaces and routing tables, you can't know what subnets are hidden
behind your router.
Are addresses in the 169.254.0.0/16 not suitable?
For IPv6, you can generate a random ULA subnet which is near guaranteed
to be unique and conflict free.
How does one do this? Which interface will it use, can I
Bonjour-broadcast it only on the local machine?
Depending on exactly what you want to do, a link-local IPv6 address may
also be a better fit as it then absolutely cannot conflict with
anything.
Also how does one do this? Which interface will it use, can I
Bonjour-broadcast it only on the local machine?
Making avahi work on 'lo' certainly sounds even nicer.
Would this be very complicated (would need upstream work on Avahi probably)?
It is said that multicast is needed and "lo" does not support multicast. Is
that true?
I sure wouldn't recommend using "dummy0". Using a differently named
device using the dummy driver would probably be fine though.
The reason to stay away from the "dummy0" name is that it's used in test
suites and other networking tools that simply call to "ip link add
dummy" and then (and that's the problem), call "ip link del dummy"
afterwards.
How can I assign a different name to a dummy interface? Can I freely
choose a name somehow, for example "ippusbxd"? Or have I to use
"dummy1", "dummy2", ... (loading the dummy kernel module with an option
to support more than one interface)?
Till
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