[avahi] avahi won't use P2P interface despite being told

[Philip Prindeville]

What does “multicast” mean on a link that’s inherently unicast by nature of being point-to-point?

This shouldn’t be required.  See:

https://github.com/lathiat/avahi/issues/305




> On May 30, 2020, at 12:32 PM, Nick Sayer <nsayer at kfu.com> wrote:
> 
> Never mind. I needed to do
> 
> ip link set [interface] multicast on
> 
> That fixed it.
> 
> 
>> On May 30, 2020, at 11:10 AM, Nick Sayer <nsayer at kfu.com> wrote:
>> 
>> I have avahi-daemon 0.7 running on a raspberry pi. I have set up a GRE tunnel to another pi and wish to have avahi on both ends of the tunnel reflect mDNS across the tunnel.
>> 
>> I’ve set allow-point-to-point=yes and enable-reflector=yes, but when I attempt to run avahi-daemon —debug, I see it making no attempt to probe or discover the point to point interface at all.
>> 
>> I did find mdns-repeater on the Internet, and that does work, except that the two hosts on either end of the GRE tunnel won’t participate since they don’t see transmitted traffic from mdns-repeater and, of course, they’re not listening on the tunnel.
>> 
>> Why doesn’t allow-point-to-point=yes actually work?
> 
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