Feature request: support interface set changes at runtime

[sandersaares]

I am trying to use igmpproxy on Ubuntu 18.04 with Docker, which creates its network interface when it is first used - it does not necessarily exist immediately after startup.

It seems to me that igmpproxy only activates if the interface exists on startup. Therefore, I need to restart igmpproxy to make it have any effect on the Docker network interface.

It would be nice if igmpproxy could detect when its interfaces of interest appear/disappear and react dynamically to a changing environment, without requiring a request.

Logs: before_and_after_docker.txt

In the above session, I access Docker while igmpproxy is running but this elicits no response from the latter. After service restart, the Docker network is detected as usual.

Config:

phyint eth0 upstream altnet 192.168.50.0/24
phyint br-a7492103597a downstream